22700
The structure - activity relationships of parabens which are widely used as preservatives for transcriptional activities mediated by human estrogen receptor alpha ( hER alpha ) , hER beta and androgen receptor ( hAR ) were investigated .
 Chemical: parabens; Chemical: estrogen; Chemical: androgen
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: parabens; Chemical: estrogen; Chemical: androgen