8131
Both blocking of classical estrogen receptors ( ER alpha / beta ) by fulvestrant and ER alpha knockdown by small interfering RNA inhibited E2 - mediated Cx43 increase , while a GPR30 - specific agonist G - 1 failed to promote Cx43 expression .
 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