| AOP Identifier | AOP Title | AO Classification | OECD Status | Taxonomic applicability | Coverage Score ⓘ The fraction of KEs within the AOP, that are mapped to the chemical-associated toxicological endpoints. | KE Identifier | KE Name |
|---|---|---|---|---|---|---|---|
| AOP:4 | Ecdysone receptor agonism leading to incomplete ecdysis associated mortality | Unclassified | - | Insects, Crustaceans | 0.1 | KE:993 | Decrease, Abdominal muscle contraction |
| AOP:8 | Upregulation of Thyroid Hormone Catabolism via Activation of Hepatic Nuclear Receptors, and Subsequent Adverse Neurodevelopmental Outcomes in Mammals | Nervous system disease | Under Development | Rat | 0.11 | KE:295 | Induction, Upregulation of glucuronyltransferase activity |
| AOP:15 | Alkylation of DNA in male pre-meiotic germ cells leading to heritable mutations | Genetic disease | WPHA/WNT Endorsed | Mus musculus, Drosophila melanogaster, Oryzias latipes, Syrian golden hamster | 0.25 | KE:155 | Inadequate DNA repair |
| AOP:38 | Protein Alkylation leading to Liver Fibrosis | Gastrointestinal system disease | WPHA/WNT Endorsed | Human, Rat | 0.14 | KE:68 | Accumulation, Collagen |
| AOP:41 | Sustained AhR Activation leading to Rodent Liver Tumours | Cancer; Gastrointestinal system disease | Under Review | Rattus sp. ABTC 42503, Mus sp. 2000082 | 0.4 | KE:853 | Changes/Inhibition, Cellular Homeostasis and Apoptosis |
| KE:139 | N/A, Hepatotoxicity, Hepatopathy, including a constellation of observable effects | ||||||
| AOP:64 | Glucocorticoid Receptor (GR) Mediated Adult Leydig Cell Dysfunction Leading to Decreased Male Fertility | Reproductive system disease | - | Rattus norvegicus | 0.14 | KE:496 | Increased apoptosis, decreased fetal/adult Leydig Cells |
| AOP:77 | Nicotinic acetylcholine receptor activation contributes to abnormal foraging and leads to colony death/failure 1 | Unclassified | - | Honey bee | 0.14 | KE:341 | Impairment, Learning and memory |
| AOP:78 | Nicotinic acetylcholine receptor activation contributes to abnormal role change within the worker bee caste leading to colony death failure 1 | Unclassified | - | Honey bee | 0.12 | KE:341 | Impairment, Learning and memory |
| AOP:80 | Nicotinic acetylcholine receptor activation contributes to accumulation of damaged mitochondrial DNA and leads to colony loss/failure | Unclassified | - | Honey bee | 0.12 | KE:664 | Overwhelmed, Mitochondrial DNA repair mechanisms |
| AOP:87 | Nicotinic acetylcholine receptor activation contributes to abnormal foraging and leads to colony loss/failure | Unclassified | - | Honey bee | 0.12 | KE:341 | Impairment, Learning and memory |
| AOP:88 | Nicotinic acetylcholine receptor activation contributes to abnormal foraging and leads to colony loss/failure via abnormal role change within caste | Unclassified | - | Honey bee | 0.14 | KE:341 | Impairment, Learning and memory |
| AOP:89 | Nicotinic acetylcholine receptor activation followed by desensitization contributes to abnormal foraging and directly leads to colony loss/failure | Unclassified | - | Honey bee | 0.12 | KE:341 | Impairment, Learning and memory |
| AOP:90 | Nicotinic acetylcholine receptor activation contributes to abnormal roll change within the worker bee caste leading to colony loss/failure 2 | Unclassified | - | Honey bee | 0.12 | KE:341 | Impairment, Learning and memory |
| AOP:96 | Axonal sodium channel modulation leading to acute mortality | Unclassified | - | Insects, Fish | 0.17 | KE:602 | Increased, Ataxia, paralysis, or hyperactivity |
| AOP:99 | Histamine (H2) receptor antagonism leading to reduced survival | Unclassified | - | Zebrafish | 0.14 | KE:341 | Impairment, Learning and memory |
| AOP:113 | Glutamate-gated chloride channel activation leading to acute mortality | Unclassified | - | Bombus impatiens, Chaetanaphothrips orchidii, Radopholus similis, Daphnia magna, Orius insidiosus, Hymenoptera, Helicoverpa zea, Lepidoptera, Liriomyza trifolii, Orius isidiosus, Acyrthosiphon kondoi | 0.17 | KE:764 | N/A, Ataxia, paralysis, or hyperactivity |
| AOP:114 | HPPD inhibition leading to corneal papillomas and carcinomas (in rat) | Cancer | - | Rattus norvegicus | 0.17 | KE:777 | Increase, Inflammation (corneal cells) |
| AOP:115 | Epithelial cytotoxicity leading to forestomach tumors (in mouse and rat) | Cancer | - | Mus musculus, Rattus norvegicus | 0.2 | KE:149 | Increase, Inflammation |
| AOP:128 | Kidney dysfunction by decreased thyroid hormone | Urinary system disease | Under Development | Sprague-Dawley, Homo sapiens | 0.09 | KE:825 | Decreased, Renal ability to dilute urine |
| AOP:136 | Intracellular Acidification Induced Olfactory Epithelial Injury Leading to Site of Contact Nasal Tumors | Benign neoplasm; Respiratory system disease | Under Review | 0.14 | KE:868 | Increase, Tissue Degeneration, Necrosis & Atrophy | |
| AOP:144 | Endocytic lysosomal uptake leading to liver fibrosis | Gastrointestinal system disease | Under Review | Human, Mouse, Rat | 0.11 | KE:68 | Accumulation, Collagen |
| AOP:164 | Beta-2 adrenergic agonist activity leading to mesovarian leiomyomas in the rat and mouse | Cancer; Reproductive system disease | - | CD-1 mouse, SD rat | 0.17 | KE:1043 | Hypertrophy/hyperplasia, smooth muscle |
| AOP:173 | Substance interaction with the pulmonary resident cell membrane components leading to pulmonary fibrosis | Musculoskeletal system disease; Respiratory system disease | WPHA/WNT Endorsed | Human, Mouse, Rat | 0.25 | KE:68 | Accumulation, Collagen |
| KE:1497 | Increased, recruitment of inflammatory cells | ||||||
| AOP:190 | Type II iodothyronine deiodinase (DIO2) inhibition leading to altered amphibian metamorphosis | Unclassified | - | African clawed frog | 0.17 | KE:1829 | Altered, Thyroid hormone-dependent gene expression |
| AOP:191 | Type III iodotyrosine deiodinase (DIO3) inhibition leading to altered amphibian metamorphosis | Unclassified | - | African clawed frog | 0.5 | KE:1154 | Increased, Triiodothyronine (T3) in tissues |
| KE:1829 | Altered, Thyroid hormone-dependent gene expression | ||||||
| AOP:194 | Hepatic nuclear receptor activation leading to altered amphibian metamorphosis | Unclassified | - | African clawed frog | 0.17 | KE:295 | Induction, Upregulation of glucuronyltransferase activity |
| AOP:206 | Peroxisome proliferator-activated receptors γ inactivation leading to lung fibrosis | Musculoskeletal system disease; Respiratory system disease | Under Development | Homo sapiens | 0.17 | KE:149 | Increase, Inflammation |
| AOP:207 | NADPH oxidase and P38 MAPK activation leading to reproductive failure in Caenorhabditis elegans | Reproductive system disease | - | Caenorhabditis elegans | 0.38 | KE:1115 | Increase, Reactive oxygen species |
| KE:1281 | Increased, DNA Damage-Repair | ||||||
| KE:1262 | Apoptosis | ||||||
| AOP:209 | Perturbation of cholesterol and glutathione homeostasis leading to hepatotoxicity: Integrated multi-OMICS approach for building AOP | Gastrointestinal system disease | - | 0.12 | KE:1287 | Glutathione synthesis | |
| AOP:212 | Histone deacetylase inhibition leading to testicular atrophy | Reproductive system disease | WPHA/WNT Endorsed | Rat, Human, Mouse | 0.17 | KE:1262 | Apoptosis |
| AOP:213 | Inhibition of fatty acid beta oxidation leading to nonalcoholic steatohepatitis (NASH) | Gastrointestinal system disease; Inherited metabolic disorder | - | Vertebrates | 0.17 | KE:1115 | Increase, Reactive oxygen species |
| AOP:220 | Cyp2E1 Activation Leading to Liver Cancer | Cancer; Gastrointestinal system disease | WPHA/WNT Endorsed | Rodents, Homo sapiens | 0.4 | KE:1393 | Hepatocytotoxicity |
| KE:1394 | Induction, persistent proliferation/sustained proliferation | ||||||
| AOP:232 | NFE2/Nrf2 repression to steatosis | Gastrointestinal system disease; Inherited metabolic disorder | - | 0.12 | KE:1419 | Reduced, FXR activity | |
| AOP:241 | Latent Transforming Growth Factor beta1 activation leads to pulmonary fibrosis | Musculoskeletal system disease; Respiratory system disease | - | 0.17 | KE:68 | Accumulation, Collagen | |
| AOP:245 | Reduction in photophosphorylation leading to growth inhibition in aquatic plants | Unclassified | - | Lemna minor, Lemna gibba | 0.09 | KE:40 | Decrease, Mitochondrial ATP production |
| AOP:258 | Renal protein alkylation leading to kidney toxicity | Urinary system disease | Under Development | Human, Rat, Mouse | 0.2 | KE:40 | Decrease, Mitochondrial ATP production |
| AOP:263 | Uncoupling of oxidative phosphorylation leading to growth inhibition via decreased cell proliferation | Unclassified | WPHA/WNT Endorsed | Zebrafish, Mouse, Rat, Lemna minor, Human, Caenorhabditis elegans | 0.5 | KE:1821 | Decrease, Cell proliferation |
| KE:1771 | Decrease, Adenosine triphosphate pool | ||||||
| AOP:264 | Uncoupling of oxidative phosphorylation leading to growth inhibition via ATP depletion associated cell death | Unclassified | Under Development | 0.25 | KE:1771 | Decrease, Adenosine triphosphate pool | |
| AOP:266 | Uncoupling of oxidative phosphorylation leading to growth inhibition via decreased Na-K ATPase activity | Unclassified | Under Development | 0.17 | KE:1771 | Decrease, Adenosine triphosphate pool | |
| AOP:267 | Uncoupling of oxidative phosphorylation leading to growth inhibition via glucose depletion | Unclassified | Under Development | 0.2 | KE:1821 | Decrease, Cell proliferation | |
| AOP:272 | Deposition of energy leading to lung cancer | Cancer | WPHA/WNT Endorsed | Human, Rat, Mouse | 0.14 | KE:155 | Inadequate DNA repair |
| AOP:280 | α-diketone-induced bronchiolitis obliterans | Musculoskeletal system disease; Respiratory system disease | - | 0.14 | KE:149 | Increase, Inflammation | |
| AOP:286 | Mitochondrial complex III antagonism leading to growth inhibition (1) | Unclassified | - | Lemna minor, Daphnia magna, Danio rerio | 0.5 | KE:1821 | Decrease, Cell proliferation |
| KE:1771 | Decrease, Adenosine triphosphate pool | ||||||
| AOP:287 | Mitochondrial complex III antagonism leading to growth inhibition (2) | Unclassified | - | Lemna minor, Daphnia magna, Danio rerio | 0.25 | KE:1771 | Decrease, Adenosine triphosphate pool |
| AOP:288 | Inhibition of 17α-hydrolase/C 10,20-lyase (Cyp17A1) activity leads to birth reproductive defects (cryptorchidism) in male (mammals) | Endocrine system disease | - | Human, Rat | 0.12 | KE:1614 | Decrease, androgen receptor activation |
| AOP:290 | Mitochondrial ATP synthase antagonism leading to growth inhibition (1) | Unclassified | - | Daphnia magna | 0.5 | KE:1821 | Decrease, Cell proliferation |
| KE:1771 | Decrease, Adenosine triphosphate pool | ||||||
| AOP:291 | Mitochondrial ATP synthase antagonism leading to growth inhibition (2) | Unclassified | - | Daphnia magna | 0.25 | KE:1771 | Decrease, Adenosine triphosphate pool |
| AOP:296 | Oxidative DNA damage leading to chromosomal aberrations and mutations | Genetic disease; Chromosomal disease | WPHA/WNT Endorsed | Human, Mice, Rat, Fish | 0.2 | KE:155 | Inadequate DNA repair |
| AOP:299 | Deposition of energy leading to population decline via DNA oxidation and follicular atresia | Unclassified | - | 0.14 | KE:1115 | Increase, Reactive oxygen species | |
| AOP:303 | Frustrated phagocytosis-induced lung cancer | Cancer | Under Development | Mammals | 0.29 | KE:1115 | Increase, Reactive oxygen species |
| KE:1497 | Increased, recruitment of inflammatory cells | ||||||
| AOP:305 | 5α-reductase inhibition leading to short anogenital distance (AGD) in male (mammalian) offspring | Unclassified | Under Development | Rat, Human, Mouse | 0.4 | KE:286 | Altered, Transcription of genes by the androgen receptor |
| KE:1614 | Decrease, androgen receptor activation | ||||||
| AOP:311 | Deposition of energy leading to population decline via DNA oxidation and oocyte apoptosis | Unclassified | - | Daphnia magna, Fish | 0.14 | KE:1115 | Increase, Reactive oxygen species |
| AOP:322 | Alkylation of DNA leading to reduced sperm count | Reproductive system disease | - | 0.2 | KE:155 | Inadequate DNA repair | |
| AOP:334 | Glucocorticoid Receptor Agonism Leading to Impaired Fin Regeneration | Unclassified | - | Teleost fish | 0.17 | KE:2245 | Altered Cell Differentiation Signaling |
| AOP:347 | Toll-like receptor 4 activation and peroxisome proliferator-activated receptor gamma inactivation leading to pulmonary fibrosis | Musculoskeletal system disease; Respiratory system disease | - | 0.11 | KE:1793 | Activator protein 1 activation | |
| AOP:374 | Binding of Sars-CoV-2 spike protein to ACE 2 receptors expressed on brain cells (neuronal and non-neuronal) leads to neuroinflammation resulting in encephalitis | Nervous system disease | Under Development | Human | 0.25 | KE:352 | N/A, Neurodegeneration |
| AOP:382 | Angiotensin II type 1 receptor (AT1R) agonism leading to lung fibrosis | Musculoskeletal system disease; Respiratory system disease | Under Development | 0.33 | KE:68 | Accumulation, Collagen | |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:383 | Inhibition of Angiotensin-converting enzyme 2 leading to liver fibrosis | Gastrointestinal system disease | Under Development | 0.17 | KE:1115 | Increase, Reactive oxygen species | |
| AOP:386 | Deposition of ionizing energy leading to population decline via inhibition of photosynthesis | Reproductive system disease | - | Lemna minor, Chlamydomonas reinhardtii | 0.12 | KE:1115 | Increase, Reactive oxygen species |
| AOP:387 | Deposition of ionising energy leading to population decline via mitochondrial dysfunction | Reproductive system disease | - | Lemna minor | 0.25 | KE:1115 | Increase, Reactive oxygen species |
| KE:40 | Decrease, Mitochondrial ATP production | ||||||
| AOP:392 | Decreased fibrinolysis and activated bradykinin system leading to hyperinflammation | Unclassified | Under Development | Humans | 0.2 | KE:1497 | Increased, recruitment of inflammatory cells |
| AOP:397 | Bulky DNA adducts leading to mutations | Genetic disease | Under Development | 0.33 | KE:155 | Inadequate DNA repair | |
| AOP:398 | Decreased ALDH1A (RALDH) activity leading to decreased fertility via disrupted meiotic initiation of fetal oogonia | Reproductive system disease | Under Development | Mouse, Rat, Human | 0.17 | KE:1881 | Decreased, all-trans retinoic acid (atRA) concentration |
| AOP:399 | Inhibition of Fyna leading to increased mortality via decreased eye size (Microphthalmos) | Unclassified | - | Zebrafish | 0.12 | KE:1821 | Decrease, Cell proliferation |
| AOP:406 | SARS-CoV-2 infection leading to hyperinflammation | Unclassified | - | 0.17 | KE:1869 | Diminished protective oxidative stress response | |
| AOP:409 | Frustrated phagocytosis leads to malignant mesothelioma | Cancer | - | 0.25 | KE:1115 | Increase, Reactive oxygen species | |
| KE:1497 | Increased, recruitment of inflammatory cells | ||||||
| AOP:416 | Aryl hydrocarbon receptor activation leading to lung cancer through IL-6 toxicity pathway | Cancer | - | 0.33 | KE:1933 | Increased, Interleukin-6 production | |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:432 | Deposition of Energy by Ionizing Radiation leading to Acute Myeloid Leukemia | Hematopoietic system disease; Cancer | - | Homo sapiens, Mus musculus | 0.09 | KE:155 | Inadequate DNA repair |
| AOP:435 | Deposition of ionising energy leads to population decline via pollen abnormal | Reproductive system disease | - | 0.17 | KE:752 | Altered, Meiotic chromosome dynamics | |
| AOP:436 | Inhibition of RALDH2 causes reduced all-trans retinoic acid levels, leading to transposition of the great arteries | Cardiovascular system disease | - | Chicken, Mouse, Vertebrates | 0.2 | KE:1881 | Decreased, all-trans retinoic acid (atRA) concentration |
| AOP:439 | Activation of the AhR leading to metastatic breast cancer | Thoracic disease; Cancer | Under Development | Humans, Mice | 0.33 | KE:1971 | Increased, tumor growth |
| KE:149 | Increase, Inflammation | ||||||
| KE:1262 | Apoptosis | ||||||
| AOP:441 | Ionizing radiation-induced DNA damage leads to microcephaly via apoptosis and premature cell differentiation | Congenital nervous system abnormality; Nervous system disease | - | Homo sapiens, Mus musculus musculus, Rattus norvegicus | 0.29 | KE:1974 | Activation of Tumor Protein 53 |
| KE:1262 | Apoptosis | ||||||
| AOP:443 | DNA damage and mutations leading to Metastatic Breast Cancer | Thoracic disease; Cancer | Under Development | Human and other cells in culture, Human, Mice, Rat, Canine heartworm nematode, Yeast | 0.3 | KE:155 | Inadequate DNA repair |
| KE:112 | Antagonism, Estrogen receptor | ||||||
| KE:1554 | Increase Chromosomal Aberrations | ||||||
| AOP:447 | Kidney failure induced by inhibition of mitochondrial electron transfer chain through apoptosis, inflammation and oxidative stress pathways | Urinary system disease | - | 0.08 | KE:1097 | Occurrence, renal proximal tubular necrosis | |
| AOP:451 | Interaction with lung resident cell membrane components leads to lung cancer | Cancer | - | Human | 0.22 | KE:1115 | Increase, Reactive oxygen species |
| KE:1497 | Increased, recruitment of inflammatory cells | ||||||
| AOP:452 | Adverse outcome pathway of PM-induced respiratory toxicity | Respiratory system disease | - | 0.09 | KE:1262 | Apoptosis | |
| AOP:460 | Antagonism of Smoothened receptor leading to orofacial clefting | Unclassified | Under Development | Mouse | 0.33 | KE:1821 | Decrease, Cell proliferation |
| KE:2043 | Decrease, Sonic Hedgehog second messenger production | ||||||
| KE:1262 | Apoptosis | ||||||
| AOP:468 | Binding of SARS-CoV-2 to ACE2 leads to hyperinflammation (via cell death) | Unclassified | - | 0.12 | KE:1497 | Increased, recruitment of inflammatory cells | |
| AOP:478 | Deposition of energy leading to occurrence of cataracts | Nervous system disease; Monogenic disease | Under Review | Human, Mouse, Rat, Rhesus monkeys, Rabbit, Guinea pig | 0.1 | KE:155 | Inadequate DNA repair |
| AOP:480 | Mitochondrial complexes inhibition leading to heart failure via decreased ATP production | Cardiovascular system disease; Thoracic disease | Under Development | 0.2 | KE:40 | Decrease, Mitochondrial ATP production | |
| AOP:482 | Deposition of energy leading to occurrence of bone loss | Musculoskeletal system disease | Under Review | Human, Mouse, Rat, Rhesus monkeys | 0.14 | KE:2245 | Altered Cell Differentiation Signaling |
| AOP:491 | Decrease, GLI1/2 target gene expression leads to orofacial clefting | Unclassified | Under Development | Mouse | 0.5 | KE:1821 | Decrease, Cell proliferation |
| KE:2043 | Decrease, Sonic Hedgehog second messenger production | ||||||
| KE:1262 | Apoptosis | ||||||
| AOP:492 | Glutathione conjugation leading to reproductive dysfunction via oxidative stress | Reproductive system disease | - | Mammals, Fish | 0.2 | KE:1115 | Increase, Reactive oxygen species |
| AOP:495 | Androgen receptor activation leading to prostate cancer | Reproductive system disease; Cancer | - | 0.22 | KE:286 | Altered, Transcription of genes by the androgen receptor | |
| KE:1183 | Decreased, Apoptosis (Epithelial Cells) | ||||||
| AOP:496 | Androgen receptor agonism leading to reproduction dysfunction (in zebrafish) | Unclassified | - | Zebrafish | 0.1 | KE:286 | Altered, Transcription of genes by the androgen receptor |
| AOP:521 | Essential element imbalance leads to reproductive failure via oxidative stress | Unclassified | - | Murinae gen. sp. | 0.14 | KE:1115 | Increase, Reactive oxygen species |
| AOP:539 | Decreased Sodium/Potassium ATPase activity leads to Heart failure | Cardiovascular system disease | - | Fish | 0.14 | KE:2237 | Decreased, Plasma sodium concentrations |
| AOP:544 | Inhibition of neuropathy target esterase leading to delayed neuropathy via increased inflammation | Nervous system disease | - | Homo sapiens, Mus musculus | 0.17 | KE:149 | Increase, Inflammation |
| AOP:563 | Aryl hydrocarbon Receptor (AHR) activation causes Premature Ovarian Insufficiency via Bax mediated apoptosis | Reproductive system disease; Endocrine system disease | - | Rat, Mouse, Zebra fish, Human | 0.17 | KE:1262 | Apoptosis |
| AOP:564 | DBDPE-induced inhibition of mitochondrial complex Ⅰ leading to population decline via neurotoxicity and metabotoxicity. | Unclassified | - | Zebrafish | 0.09 | KE:40 | Decrease, Mitochondrial ATP production |
| AOP:569 | Decreased DNA methylation of FAM50B/PTCHD3 leading to IQ loss of children via PI3K-Akt pathway | Developmental disorder of mental health | - | 0.33 | KE:1115 | Increase, Reactive oxygen species | |
| KE:2195 | Increase, CNS Neural cell death |
| AOP Identifier | AOP Title | AO Classification | OECD Status | Taxonomic applicability | Coverage Score ⓘ The fraction of KEs within the AOP, that are mapped to the chemical-associated toxicological endpoints. | KE Identifier | KE Name |
|---|---|---|---|---|---|---|---|
| AOP:6 | Antagonist binding to PPARα leading to body-weight loss | Symptom | WPHA/WNT Endorsed | Mus musculus, Homo sapiens, Pimephales promelas, Colinus virginianus, Rattus norvegicus | 0.12 | KE:864 | Decreased, Body Weight |
| AOP:12 | Chronic binding of antagonist to N-methyl-D-aspartate receptors (NMDARs) during brain development leads to neurodegeneration with impairment in learning and memory in aging | Nervous system disease; Developmental disorder of mental health | WPHA/WNT Endorsed | Monkey, Rat, Human, Mouse, Zebrafish | 0.25 | KE:352 | N/A, Neurodegeneration |
| KE:341 | Impairment, Learning and memory | ||||||
| AOP:13 | Chronic binding of antagonist to N-methyl-D-aspartate receptors (NMDARs) during brain development induces impairment of learning and memory abilities | Developmental disorder of mental health | WPHA/WNT Endorsed | Human, Mouse, Monkey sp., Rat | 0.1 | KE:341 | Impairment, Learning and memory |
| AOP:17 | Binding of electrophilic chemicals to SH(thiol)-group of proteins and /or to seleno-proteins involved in protection against oxidative stress during brain development leads to impairment of learning and memory | Developmental disorder of mental health | WPHA/WNT Endorsed | Rat, Mouse, Human | 0.1 | KE:341 | Impairment, Learning and memory |
| AOP:37 | PPARα activation leading to hepatocellular adenomas and carcinomas in rodents | Cancer; Gastrointestinal system disease | Under Development | Mouse, Rat | 0.4 | KE:716 | Increase, cell proliferation (hepatocytes) |
| KE:719 | Increase, hepatocellular adenomas and carcinomas | ||||||
| AOP:42 | Inhibition of Thyroperoxidase and Subsequent Adverse Neurodevelopmental Outcomes in Mammals | Cognitive disorder | WPHA/WNT Endorsed | Human, Rat, Mouse | 0.12 | KE:402 | Cognitive function, decreased |
| AOP:48 | Binding of agonists to ionotropic glutamate receptors in adult brain causes excitotoxicity that mediates neuronal cell death, contributing to learning and memory impairment. | Developmental disorder of mental health | WPHA/WNT Endorsed | Human, Mouse, Rat | 0.22 | KE:352 | N/A, Neurodegeneration |
| KE:341 | Impairment, Learning and memory | ||||||
| AOP:54 | Inhibition of Na+/I- symporter (NIS) leads to learning and memory impairment | Developmental disorder of mental health | WPHA/WNT Endorsed | Homo sapiens, Rattus sp. | 0.1 | KE:341 | Impairment, Learning and memory |
| AOP:107 | Constitutive androstane receptor activation leading to hepatocellular adenomas and carcinomas in the mouse and the rat | Cancer; Gastrointestinal system disease | Under Review | Rattus norvegicus, Mus musculus | 0.6 | KE:1214 | Altered gene expression specific to CAR activation, Hepatocytes |
| KE:719 | Increase, hepatocellular adenomas and carcinomas | ||||||
| KE:716 | Increase, cell proliferation (hepatocytes) | ||||||
| AOP:108 | Inhibition of pyruvate dehydrogenase kinase leading to hepatocellular adenomas and carcinomas (in mouse and rat) | Cancer; Gastrointestinal system disease | - | Mus musculus, Rattus norvegicus | 0.17 | KE:719 | Increase, hepatocellular adenomas and carcinomas |
| AOP:117 | Androgen receptor activation leading to hepatocellular adenomas and carcinomas (in mouse and rat) | Cancer; Gastrointestinal system disease | Under Development | Mus musculus, Rattus norvegicus | 0.5 | KE:716 | Increase, cell proliferation (hepatocytes) |
| KE:719 | Increase, hepatocellular adenomas and carcinomas | ||||||
| AOP:134 | Sodium Iodide Symporter (NIS) Inhibition and Subsequent Adverse Neurodevelopmental Outcomes in Mammals | Cognitive disorder | - | Rat, Homo sapiens | 0.11 | KE:402 | Cognitive function, decreased |
| AOP:139 | Alkylation of DNA leading to cancer 1 | Cancer | - | Homo sapiens, Mus musculus | 0.5 | KE:885 | Increase, Cancer |
| KE:155 | Inadequate DNA repair | ||||||
| AOP:148 | EGFR Activation Leading to Decreased Lung Function | Respiratory system disease | Under Development | Human, Mouse, Rat | 0.25 | KE:1250 | Decrease, Lung function |
| AOP:149 | Peptide Oxidation Leading to Hypertension | Cardiovascular system disease | Under Development | Human, Mouse, Rat, Cow | 0.1 | KE:952 | Hypertension |
| AOP:196 | Volatile Organic Chemicals Activate TRPA1 Receptor to Induce Sensory Pulmonary Irritation | Respiratory system disease | - | 0.11 | KE:1226 | Increased Respiratory irritability and Chronic Cough, | |
| AOP:205 | AOP from chemical insult to cell death | Unclassified | - | Vertebrates | 0.33 | KE:1263 | Necrosis |
| KE:1262 | Apoptosis | ||||||
| AOP:260 | CYP2E1 activation and formation of protein adducts leading to neurodegeneration | Nervous system disease | - | Human | 0.14 | KE:1514 | Neurodegeneration |
| AOP:279 | Microtubule interacting drugs lead to peripheral neuropathy | Nervous system disease | - | 0.25 | KE:1583 | Sensory axonal peripheral neuropathy | |
| AOP:281 | Acetylcholinesterase Inhibition Leading to Neurodegeneration | Nervous system disease | - | 0.1 | KE:352 | N/A, Neurodegeneration | |
| AOP:302 | Lung surfactant function inhibition leading to decreased lung function | Respiratory system disease | Under Development | Human, Mouse, Rat | 0.2 | KE:1250 | Decrease, Lung function |
| AOP:379 | Binding to ACE2 leading to thrombosis and disseminated intravascular coagulation | Cardiovascular system disease | Under Development | Homo sapiens | 0.43 | KE:1846 | Thrombosis and Disseminated Intravascular Coagulation |
| KE:1845 | Coagulation | ||||||
| KE:1869 | Diminished protective oxidative stress response | ||||||
| AOP:384 | Hyperactivation of ACE/Ang-II/AT1R axis leading to chronic kidney disease | Urinary system disease | - | 0.33 | KE:1603 | Chronic kidney disease | |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:405 | Organo-Phosphate Chemicals induced inhibition of AChE leading to impaired cognitive function | Cognitive disorder | - | Rattus norvegicus, Mus musculus, Homo sapiens | 0.2 | KE:402 | Cognitive function, decreased |
| AOP:411 | Oxidative stress Leading to Decreased Lung Function | Respiratory system disease | - | Homo sapiens | 0.25 | KE:1250 | Decrease, Lung function |
| AOP:418 | Aryl hydrocarbon receptor activation leading to impaired lung function through AHR-ARNT toxicity pathway | Respiratory system disease | - | 0.4 | KE:1250 | Decrease, Lung function | |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:419 | Aryl hydrocarbon receptor activation leading to impaired lung function through P53 toxicity pathway | Respiratory system disease | - | 0.5 | KE:1250 | Decrease, Lung function | |
| KE:1262 | Apoptosis | ||||||
| AOP:424 | Oxidative stress Leading to Decreased Lung Function via CFTR dysfunction | Respiratory system disease | - | Human | 0.17 | KE:1250 | Decrease, Lung function |
| AOP:425 | Oxidative Stress Leading to Decreased Lung Function via Decreased FOXJ1 | Respiratory system disease | - | Human | 0.17 | KE:1250 | Decrease, Lung function |
| AOP:442 | Binding to voltage gate sodium channels during development leads to cognitive impairment | Cognitive disorder | Under Review | Rattus norvegicus, Mouse, Humans | 0.14 | KE:402 | Cognitive function, decreased |
| AOP:450 | Inhibition of AChE and activation of CYP2E1 leading to sensory axonal peripheral neuropathy and mortality | Nervous system disease | - | Rattus norvegicus, Mus musculus, Homo sapiens | 0.29 | KE:1583 | Sensory axonal peripheral neuropathy |
| KE:352 | N/A, Neurodegeneration | ||||||
| AOP:458 | AhR activation in the liver leading to Subsequent Adverse Neurodevelopmental Outcomes in Mammals | Cognitive disorder | - | Rat, Mouse, Monkey, Human | 0.25 | KE:295 | Induction, Upregulation of glucuronyltransferase activity |
| KE:402 | Cognitive function, decreased | ||||||
| AOP:459 | AhR activation in the thyroid leading to Subsequent Adverse Neurodevelopmental Outcomes in Mammals | Cognitive disorder | - | Human, Mouse, Rat | 0.11 | KE:402 | Cognitive function, decreased |
| AOP:474 | Succinate dehydrogenase inactivation leads to cancer by promoting EMT | Cancer | Under Development | Human and other cells in culture | 0.2 | KE:885 | Increase, Cancer |
| AOP:475 | Binding of chemicals to ionotropic glutamate receptors leads to impairment of learning and memory via loss of drebrin from dendritic spines of neurons | Developmental disorder of mental health | Under Development | Mouse, Rat, Human, Caenorhabditis elegans | 0.12 | KE:341 | Impairment, Learning and memory |
| AOP:483 | Deposition of Energy Leading to Learning and Memory Impairment | Developmental disorder of mental health | Under Review | Mouse, Rat, Rabbit, Dog, Pigs, Cow, Human | 0.12 | KE:341 | Impairment, Learning and memory |
| AOP:486 | Binding to the extracellular protein laminin leading to decreased cognitive function | Cognitive disorder | - | Human | 0.14 | KE:402 | Cognitive function, decreased |
| AOP:490 | Co-activation of IP3R and RyR leads to reduced IQ through non-cholinergic mechanisms | Developmental disorder of mental health | - | 0.18 | KE:2123 | decreased, Bcl-2 expression | |
| KE:341 | Impairment, Learning and memory | ||||||
| AOP:498 | Increased LCN2/iron complex leading to neurological disorders | Nervous system disease | - | Homo sapiens | 0.5 | KE:2150 | Neurological disorder |
| KE:191 | Neuronal dysfunction | ||||||
| AOP:499 | Activation of MEK-ERK1/2 leads to deficits in learning and cognition via disrupted neurotransmitter release | Developmental disorder of mental health | - | Rattus norvegicus, Mus musculus, Homo sapiens | 0.25 | KE:341 | Impairment, Learning and memory |
| AOP:500 | Activation of MEK-ERK1/2 leads to deficits in learning and cognition via ROS and apoptosis | Developmental disorder of mental health | - | Rattus norvegicus, Mus musculus, Homo sapiens | 0.57 | KE:1262 | Apoptosis |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| KE:352 | N/A, Neurodegeneration | ||||||
| KE:341 | Impairment, Learning and memory | ||||||
| AOP:501 | Excessive iron accumulation leading to neurological disorders | Nervous system disease | - | Homo sapiens | 0.25 | KE:2150 | Neurological disorder |
| AOP:520 | Retinoic acid receptor agonism during neurodevelopment leading to impaired learning and memory | Developmental disorder of mental health | - | Mouse, Rat, Human | 0.2 | KE:341 | Impairment, Learning and memory |
| AOP:525 | Reduced oligodendrocyte differentiation during neurodevelopment leading to impaired learning and memory | Developmental disorder of mental health | - | 0.15 | KE:1656 | Antagonism, Thyroid Receptor | |
| KE:341 | Impairment, Learning and memory | ||||||
| AOP:533 | Retinoic acid receptor antagonism during neurodevelopment leading to impaired learning and memory | Developmental disorder of mental health | - | 0.17 | KE:341 | Impairment, Learning and memory | |
| AOP:534 | Succinate dehydrogenase (SDH) inhibition leads to cancer through oxidative stress | Cancer | - | Vertebrates | 0.33 | KE:885 | Increase, Cancer |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:535 | Binding and activation of GPER leading to learning and memory impairments | Developmental disorder of mental health | - | Mouse, Human | 0.22 | KE:1262 | Apoptosis |
| KE:341 | Impairment, Learning and memory | ||||||
| AOP:546 | Succinate dehydrogenase inactivation leads to cancer through hypoxic-like mechanisms | Cancer | - | Human and other cells in culture | 0.2 | KE:885 | Increase, Cancer |
| AOP Identifier | AOP Title | AO Classification | OECD Status | Taxonomic applicability | Coverage Score ⓘ The fraction of KEs within the AOP, that are mapped to the chemical-associated toxicological endpoints. | KE Identifier | KE Name |
|---|---|---|---|---|---|---|---|
| AOP:19 | Androgen receptor antagonism leading to adverse effects in the male foetus (mammals) | Reproductive system disease | - | 0.6 | KE:286 | Altered, Transcription of genes by the androgen receptor | |
| KE:310 | Alteration, Wnt pathway | ||||||
| KE:26 | Antagonism, Androgen receptor | ||||||
| AOP:30 | Estrogen receptor antagonism leading to reproductive dysfunction | Unclassified | Under Review | Zebra danio, Fathead minnow, Medaka | 0.17 | KE:112 | Antagonism, Estrogen receptor |
| AOP:62 | AKT2 activation leading to hepatic steatosis | Gastrointestinal system disease; Inherited metabolic disorder | - | 0.25 | KE:486 | systemic inflammation leading to hepatic steatosis | |
| AOP:111 | Decrease in androgen receptor activity leading to Leydig cell tumors (in rat) | Cancer; Reproductive system disease | - | Rattus norvegicus | 0.2 | KE:1614 | Decrease, androgen receptor activation |
| AOP:282 | Adverse outcome pathway on photochemical toxicity initiated by light exposure | Unclassified | Under Review | Human | 0.25 | KE:1115 | Increase, Reactive oxygen species |
| AOP:298 | Increase in reactive oxygen species (ROS) leading to human treatment-resistant gastric cancer via chronic ROS | Cancer; Gastrointestinal system disease | Under Review | Homo sapiens | 0.33 | KE:1753 | Chronic reactive oxygen species |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:306 | Androgen receptor (AR) antagonism leading to short anogenital distance (AGD) in male (mammalian) offspring | Unclassified | Under Development | Rat, Human, Mouse | 0.75 | KE:286 | Altered, Transcription of genes by the androgen receptor |
| KE:1614 | Decrease, androgen receptor activation | ||||||
| KE:26 | Antagonism, Androgen receptor | ||||||
| AOP:324 | Excessive reactive oxygen species leading to growth inhibition via oxidative DNA damage and cell death | Unclassified | - | Fish | 0.25 | KE:1115 | Increase, Reactive oxygen species |
| AOP:325 | Excessive reactive oxygen species leading to growth inhibition via lipid peroxidation and cell death | Unclassified | - | Fish | 0.25 | KE:1115 | Increase, Reactive oxygen species |
| AOP:326 | Excessive reactive oxygen species leading to growth inhibition via protein oxidation and cell death | Unclassified | - | Fish | 0.25 | KE:1115 | Increase, Reactive oxygen species |
| AOP:327 | Excessive reactive oxygen species production leading to mortality (1) | Unclassified | - | Daphnia magna | 0.2 | KE:1115 | Increase, Reactive oxygen species |
| AOP:328 | Excessive reactive oxygen species production leading to mortality (2) | Unclassified | - | Daphnia magna | 0.4 | KE:1771 | Decrease, Adenosine triphosphate pool |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:329 | Excessive reactive oxygen species production leading to mortality (3) | Unclassified | - | Daphnia magna, Paracyclopina nana | 0.4 | KE:1771 | Decrease, Adenosine triphosphate pool |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:330 | Excessive reactive oxygen species production leading to mortality (4) | Unclassified | - | Daphnia magna | 0.2 | KE:1115 | Increase, Reactive oxygen species |
| AOP:331 | Excessive reactive oxygen species leading to growth inhibition via oxidative DNA damage and reduced cell proliferation | Unclassified | - | Daphnia magna, Daphnia middendorffiana, Daphnia pulex, Daphnia pulicaria, Daphnia parvula | 0.33 | KE:1821 | Decrease, Cell proliferation |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:332 | Excessive reactive oxygen species leading to growth inhibition via lipid peroxidation and reduced cell proliferation | Unclassified | - | 0.4 | KE:1821 | Decrease, Cell proliferation | |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:333 | Excessive reactive oxygen species leading to growth inhibition via uncoupling of oxidative phosphorylation | Unclassified | - | 0.6 | KE:1771 | Decrease, Adenosine triphosphate pool | |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| KE:1821 | Decrease, Cell proliferation | ||||||
| AOP:344 | Androgen receptor (AR) antagonism leading to nipple retention (NR) in male (mammalian) offspring | Unclassified | Under Development | 0.75 | KE:286 | Altered, Transcription of genes by the androgen receptor | |
| KE:1614 | Decrease, androgen receptor activation | ||||||
| KE:26 | Antagonism, Androgen receptor | ||||||
| AOP:345 | Androgen receptor (AR) antagonism leading to decreased fertility in females | Endocrine system disease; Reproductive system disease; Reproductive system disease | Under Development | Mammals | 0.5 | KE:286 | Altered, Transcription of genes by the androgen receptor |
| KE:1614 | Decrease, androgen receptor activation | ||||||
| KE:26 | Antagonism, Androgen receptor | ||||||
| AOP:372 | Androgen receptor antagonism leading to testicular cancer | Endocrine system disease; Reproductive system disease; Cancer | - | 0.6 | KE:286 | Altered, Transcription of genes by the androgen receptor | |
| KE:1614 | Decrease, androgen receptor activation | ||||||
| KE:26 | Antagonism, Androgen receptor | ||||||
| AOP:413 | Oxidation and antagonism of reduced glutathione leading to mortality via acute renal failure | Unclassified | - | Fish, Mice | 0.5 | KE:1607 | Increase, Necrosis |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| KE:926 | Oxidation, Glutathione (To be considered with MIE) | ||||||
| AOP:423 | Toxicological mechanisms of hepatocyte apoptosis through the PARP1 dependent cell death pathway | Unclassified | - | 0.17 | KE:1115 | Increase, Reactive oxygen species | |
| AOP:438 | reactive oxygen species generation leading to increased cardiovascular morbidity and mortality | Cardiovascular system disease | - | 0.08 | KE:1115 | Increase, Reactive oxygen species | |
| AOP:440 | Hypothalamus estrogen receptors activity suppression leading to ovarian cancer via ovarian epithelial cell hyperplasia | Benign neoplasm; Endocrine system disease; Reproductive system disease; Reproductive system disease; Cancer; Endocrine system disease | Under Development | Human, Rat, Mice | 0.11 | KE:1046 | Suppression, Estrogen receptor (ER) activity |
| AOP:446 | PM-related Adverse outcome pathway frameworks on various systems | Respiratory system disease | - | 0.25 | KE:1115 | Increase, Reactive oxygen species | |
| KE:1250 | Decrease, Lung function | ||||||
| KE:149 | Increase, Inflammation | ||||||
| KE:1497 | Increased, recruitment of inflammatory cells | ||||||
| KE:1262 | Apoptosis | ||||||
| AOP:448 | ROS, inflammation, and activation of nAChR lead to increased incidence of cardiovascular morbidity and mortality | Cardiovascular system disease | - | 0.06 | KE:1115 | Increase, Reactive oxygen species | |
| AOP:453 | Reactive oxygen species and subsequent oxidative stress lead to increased incidence of digestive morbidity and mortality in the general population | Gastrointestinal system disease | - | 0.08 | KE:1115 | Increase, Reactive oxygen species | |
| AOP:469 | Reactive oxygen speicies overproduction leading to increased digestive morbidity and mortality in generation population | Gastrointestinal system disease | - | 0.08 | KE:1115 | Increase, Reactive oxygen species | |
| AOP:472 | DNA adduct formation leading to kidney failure | Urinary system disease | - | 0.33 | KE:1097 | Occurrence, renal proximal tubular necrosis | |
| KE:149 | Increase, Inflammation | ||||||
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:477 | Androgen receptor (AR) antagonism leading to hypospadias in male (mammalian) offspring | Physical disorder | - | 0.67 | KE:1614 | Decrease, androgen receptor activation | |
| KE:26 | Antagonism, Androgen receptor | ||||||
| AOP:493 | ERa inactivation alters AT expansion and functions and leads to insulin resistance and metabolically unhealthy obesity | Acquired metabolic disease | - | Mus musculus, Homo sapiens | 0.2 | KE:2126 | Estrogen receptor alpha inactivation |
| KE:1497 | Increased, recruitment of inflammatory cells | ||||||
| AOP:497 | ERa inactivation alters mitochondrial functions and insulin signalling in skeletal muscle and leads to insulin resistance and metabolic syndrome | Inherited metabolic disorder; Disease of metabolism | - | 0.25 | KE:2126 | Estrogen receptor alpha inactivation | |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:511 | The AOP framework on ROS-mediated oxidative stress induced vascular disrupting effects | Cardiovascular system disease | - | Human, Mouse, Zebrafish | 0.12 | KE:2172 | Activated Wnt/Frizzled pathway |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:540 | Oxidative Stress in the Fish Ovary Leads to Reproductive Impairment via Reduced Vitellogenin Production | Unclassified | - | 0.22 | KE:1115 | Increase, Reactive oxygen species | |
| KE:1262 | Apoptosis | ||||||
| AOP:541 | Excessive ROS generation leading to increased incidence of vascular calcification by VSMC phenotype switching | Cardiovascular system disease | - | 0.08 | KE:1115 | Increase, Reactive oxygen species |
| AOP Identifier | AOP Title | AO Classification | OECD Status | Taxonomic applicability | Coverage Score ⓘ The fraction of KEs within the AOP, that are mapped to the chemical-associated toxicological endpoints. | KE Identifier | KE Name |
|---|---|---|---|---|---|---|---|
| AOP:27 | Cholestatic Liver Injury induced by Inhibition of the Bile Salt Export Pump (ABCB11) | Gastrointestinal system disease | Under Development | Humans | 0.5 | KE:357 | Cholestasis, Pathology |
| KE:41 | Inhibition, Bile Salt Export Pump (ABCB11) | ||||||
| KE:149 | Increase, Inflammation | ||||||
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:106 | Chemical binding to tubulin in oocytes leading to aneuploid offspring | Chromosomal disease | Under Review | Mus musculus, Homo sapiens, Hamster | 1.0 | KE:723 | Altered, Chromosome number |
| KE:728 | Increase, Aneuploid offspring | ||||||
| KE:720 | Disruption, Microtubule dynamics | ||||||
| KE:721 | Disorganization, Meiotic Spindle | ||||||
| KE:752 | Altered, Meiotic chromosome dynamics | ||||||
| KE:718 | Binding, Tubulin | ||||||
| AOP:118 | Chronic cytotoxicity leading to hepatocellular adenomas and carcinomas (in mouse and rat) | Cancer; Gastrointestinal system disease | - | Mus musculus, Rattus norvegicus | 0.5 | KE:719 | Increase, hepatocellular adenomas and carcinomas |
| KE:786 | Increase, Cytotoxicity (hepatocytes) | ||||||
| AOP:300 | Thyroid Receptor Antagonism and Subsequent Adverse Neurodevelopmental Outcomes in Mammals | Cognitive disorder | Under Development | Human, Mouse | 0.4 | KE:1656 | Antagonism, Thyroid Receptor |
| KE:402 | Cognitive function, decreased | ||||||
| AOP:463 | The AOP framwork on silica nanopariticles induced hepatoxicity | Gastrointestinal system disease | - | 0.36 | KE:2034 | liver dysfunction | |
| KE:149 | Increase, Inflammation | ||||||
| KE:1115 | Increase, Reactive oxygen species | ||||||
| KE:1262 | Apoptosis | ||||||
| AOP:485 | Thyroid hormone antagonism leading to impaired oligodendrocyte maturation during development and subsequent decreased cognition | Cognitive disorder | - | Human | 0.29 | KE:1656 | Antagonism, Thyroid Receptor |
| KE:402 | Cognitive function, decreased | ||||||
| AOP:488 | Increased reactive oxygen species production leading to decreased cognitive function | Cognitive disorder | - | Human | 0.43 | KE:1869 | Diminished protective oxidative stress response |
| KE:1115 | Increase, Reactive oxygen species | ||||||
| KE:402 | Cognitive function, decreased | ||||||
| AOP:505 | Reactive Oxygen Species (ROS) formation leads to cancer via inflammation pathway | Cancer | - | Human, Mouse, Rat | 0.6 | KE:885 | Increase, Cancer |
| KE:149 | Increase, Inflammation | ||||||
| KE:1115 | Increase, Reactive oxygen species | ||||||
| AOP:513 | Reactive Oxygen (ROS) formation leads to cancer via Peroxisome proliferation-activated receptor (PPAR) pathway | Cancer | - | Human, Mouse, Rat | 0.4 | KE:885 | Increase, Cancer |
| KE:1115 | Increase, Reactive oxygen species |
We have built a comprehensive resource which compiles potential endocrine disrupting chemicals (EDCs) based on the observed adverse effects or endocrine-mediated endpoints in published experiments on humans or rodents to support basic research. We are not responsible for any errors or omissions in the published research articles or supporting literature on potential EDCs compiled in this resource. Users are advised to exercise their own judgement on the weight of evidence for potential EDCs compiled in this resource. Importantly, our sole goal to build this resource on potential EDCs is to enable future basic research towards better understanding of the systems-level perturbations upon chemical exposure rather than influencing regulatory advice on chemical use.