3800
Assuming that 9-cis-retinoic acid ( 9-cis-RA ) inhibits TCR-mediated apoptosis , nur77 may cause apoptosis by monomer in the absence of 9-cis-RA and may inhibit apoptosis by heterodimer with RXR in the presence of 9-cis-RA .
 ( protein: RXR, None) , ( protein: nur77, 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, None) , ( protein: nur77, None) 