4468
Vitamin D3- and retinoic acid- induced monocytic differentiation : interactions between the endogenous vitamin D3 receptor , retinoic acid receptors , and retinoid X receptors in U-937 cells .
 ( protein: retinoic acid receptors, None) , ( protein: retinoid X receptors, None) , ( protein: endogenous vitamin D3 receptor, None) , ( cell line: U-937 cells, 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: retinoic acid receptors, None) , ( protein: retinoid X receptors, None) , ( protein: endogenous vitamin D3 receptor, None) , ( cell line: U-937 cells, None) 