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Therefore, we analyzed the expression, DNA binding, and transcriptional activity of the endogenous RA and VitD3 receptors [ retinoic acid receptors ( RARs ), retinoid X receptors ( RXRs ), and VitD3 receptor ( VDR )] in the U-937 cell line , in which RA and VitD3 induce distinct monocytic differentiation pathways .
 ( protein: retinoic acid, None) , ( protein: VDR, None) , ( protein: VitD3 receptor, None) , ( protein: retinoic acid receptors, None) , ( protein: retinoid X receptors, None) , ( protein: endogenous RA and VitD3 receptors, None) , ( cell line: U-937 cell line, None) , ( protein: RARs, None) , ( protein: RXRs, 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, None) , ( protein: VDR, None) , ( protein: VitD3 receptor, None) , ( protein: retinoic acid receptors, None) , ( protein: retinoid X receptors, None) , ( protein: endogenous RA and VitD3 receptors, None) , ( cell line: U-937 cell line, None) , ( protein: RARs, None) , ( protein: RXRs, None) 