7472
This effect can be associated with the activation of specific hormone receptors, since we observed the expression of the estrogen receptor alpha (ER-alpha) , ER-beta , and progesterone receptor (PR) mRNAs ; the ER-alpha protein expression was confirmed by immunocytochemical analysis .
 ( protein: ER-alpha, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: ER-alpha, None) 