13694
Additionally, to determine the impact of RXR for erythroid cell development , dominant interfering mutant RXRs , lacking the transcriptional activator functions AF-1 and AF-2 , or AF-2 only, or the entire DNA-binding domain , were introduced into erythroid progenitor cells via recombinant retrovirus vectors and analyzed for RXR -specific effects.
 ( protein: RXR, None) , ( protein: AF-1, None) , ( protein: RXR, None) , ( protein: AF-2, None) , ( protein: mutant RXRs, None) , ( cell type: erythroid progenitor cells, None) , ( DNA: entire DNA-binding domain, None) , ( protein: AF-2, 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: AF-1, None) , ( protein: RXR, None) , ( protein: AF-2, None) , ( protein: mutant RXRs, None) , ( cell type: erythroid progenitor cells, None) , ( DNA: entire DNA-binding domain, None) , ( protein: AF-2, None) 