6978
The effect of oestrogens on oestrogen -receptive organs and cells is mediated via intracellular receptors ( ERalpha and ERbeta ).
 ( protein: ERbeta, None) , ( protein: intracellular receptors, None) , ( protein: ERalpha, 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: ERbeta, None) , ( protein: intracellular receptors, None) , ( protein: ERalpha, None) 