5090
Using synthetic ligands to retinoic acid receptors ( RARs ) and retinoid X receptors ( RXRs ) that selectively bind and activate RAR-RXR or RXR-RXR dimers, respectively, we dissected the involvement of the two retinoid response pathways in the regulation of normal myeloid and erythroid progenitor cell growth .
 ( protein: RXR-RXR, None) , ( protein: RXRs, None) , ( protein: retinoic acid receptors, None) , ( protein: retinoid X receptors, None) , ( protein: RARs, None) , ( protein: RAR-RXR, 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: RXR-RXR, None) , ( protein: RXRs, None) , ( protein: retinoic acid receptors, None) , ( protein: retinoid X receptors, None) , ( protein: RARs, None) , ( protein: RAR-RXR, None) 