25984
To determine the role of these sites , we examined the effect of progestins on the transcription of the bcl - x gene , where only intragenic progesterone receptor - binding sites ( PRbs ) were identified .
 Chemical: progesterone
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: progesterone