2954
In this study , the mRNA and protein expression of major phase II enzymes , as well as key regulatory transcription factors , were quantified in livers of time - matched pregnant and virgin control C57BL / 6 mice on gestation days ( GD ) 7 , 11 , 14 , 17 , and postnatal days ( PND ) 1 , 15 , and 30 .
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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