13707
Among infertile women , the mean expression of estrogen receptor alpha ( ER alpha ) and beta ( Er beta ) , androgen receptor ( AR ) and pregnane X receptor ( PXR ) was significantly higher than fertile patients .
 Chemical: estrogen; Chemical: androgen; Chemical: pregnane
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: estrogen; Chemical: androgen; Chemical: pregnane