12759
In the present study , we examined the xenoestrogenic effect of BP - 1 on BG - 1 human ovarian cancer cells expressing estrogen receptors ( ERs ) and relevant xenografted animal models in comparison with 17 - beta estradiol ( E2 ) .
 Chemical: BP - 1; Chemical: estrogen; Chemical: 17 - beta 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: BP - 1, estrogen, 17 - beta estradiol 
Answer:
 Chemical: BP - 1; Chemical: estrogen; Chemical: 17 - beta estradiol