14307
Computational in vitro - to - in vivo extrapolation was used to estimate the daily dose in a rat , called the oral equivalent dose , which would result in steady - state in vivo blood concentrations equivalent to the AC 50 or lowest effective concentration ( LEC ) across more than 600 ToxCast phase I in vitro assays .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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