17α-Ethinylestradiol (EE2)-A synthetic estrogen. 17p-Estradiol (E2)-Natural estrogen hormone that occurs in mammals. Contaminant of emerging concern (CEC)-A chemical for which there are increasing concerns regarding its potential risks to humans and ecological systems, including endocrine disruption and neurotoxicity. Within the broad category of CECs monitored, however, agencies have widely different definitions as to what a CEC actually is.
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