7405
Relative mRNA expression of several enzymes involved in the metabolism of pesticides , including hepatic cytochromes ( Cyp ) P450s , carboxylesterases ( Ces ) , and paraoxonase 1 ( Pon1 ) , were assessed in mice during gestation and the postpartum period .
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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:
 None