3946
In breast cancer ( BC ) epithelial cells , the mitogenic action of estradiol is transduced through binding to two receptors , ER alpha and ER beta , which act as transcription factors .
 Chemical: estradiol
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: estradiol 
Answer:
 Chemical: estradiol