5234
The aim of this study was to determine whether the changes of CYP2D6 activity observed during human pregnancy could be replicated in the mouse , and explore possible mechanisms of increased CYP2D6 activity during pregnancy .
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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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