17856
In the perinatal rat brain , estrogen is masculinizing , suggesting that BPA - induced perturbation of estrogen receptor ( ESR ) expression may underpin later in - life neuroendocrine effects .
 Chemical: estrogen; Chemical: BPA; Chemical: estrogen
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: BPA; Chemical: estrogen