18866
Metabolic activation of PAHs and aryl - and heterocyclic amines to genotoxic products was examined in Salmonella typhimurium NM2009 , and we found that P450 2A13 and 2A6 ( as well as P450 1B1 ) were able to activate several of these procarcinogens .
 Chemical: PAHs; Chemical: aryl - and heterocyclic amines
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: PAHs; Chemical: aryl - and heterocyclic amines