21235
Classification and regression based quantitative structure - toxicity relationship ( QSTR ) as well as toxicophore models were developed for the first time on basal cytotoxicity data ( in vitro 3T3 neutral red uptake data ) of a diverse series of chemicals ( including drugs and environmental pollutants ) collected from the ACuteTox database ( http : / / www . acutetox . eu / ) .
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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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