9517
In particular, the part played by the retinoid X receptors ( RXRs ), which are members of the steroid/thyroid hormone nuclear receptor family , has not been explored.
 ( protein: retinoid X receptors, None) , ( protein: RXRs, None) , ( protein: steroid/thyroid hormone nuclear receptor family, 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: retinoid X receptors, None) , ( protein: RXRs, None) , ( protein: steroid/thyroid hormone nuclear receptor family, None) 