ToxCast™ Phases I and II are testing a combined total of about 2,000 chemicals. Chemical nominations came from within EPA, from other U.S. agencies (NTP, NIEHS, FDA), from international organizations such as OECD and from other stakeholder groups. In Phase III, ToxCastTM will expand the list to thousands of environmental chemicals, delivering an affordable, science-based system for decision-makers.
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