1396
Because estradiol concentrations increase by ~ 50 - fold during human pregnancy , it was hypothesized that the increasing estradiol concentrations during human pregnancy would result in induction of CYP2B6 activity .
 Chemical: estradiol; Chemical: estradiol
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: estradiol; Chemical: estradiol