13695
It was found that expression of wild-type RXR and of the RXR mutants devoid of AF-1 and/or AF-2 supported a transient outgrowth of erythroid cells .
 ( protein: RXR, None) , ( protein: RXR, None) , ( protein: wild-type RXR, None) , ( cell type: erythroid cells, None) , ( protein: AF-1, None) , ( protein: AF-2, None) , ( protein: RXR mutants, 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: RXR, None) , ( protein: wild-type RXR, None) , ( cell type: erythroid cells, None) , ( protein: AF-1, None) , ( protein: AF-2, None) , ( protein: RXR mutants, None) 