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The 8 nitriles were assessed for genotoxicity using an Ames test , in - vitro chromosome aberration test or in - vitro micronucleus test .
 Chemical: nitriles
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nitriles