6615
The GATA-1 autoregulatory enhancer effectively restricts the expression of the LTR-driven proviral transcription unit to the erythroblastic progeny of both human progenitors and mouse-repopulating stem cells .
 ( DNA: GATA-1 autoregulatory enhancer, None) , ( cell type: erythroblastic progeny, None) , ( DNA: LTR-driven proviral transcription unit, None) , ( cell line: mouse-repopulating stem cells, None) , ( cell type: human progenitors, 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:
 ( DNA: GATA-1 autoregulatory enhancer, None) , ( cell type: erythroblastic progeny, None) , ( DNA: LTR-driven proviral transcription unit, None) , ( cell line: mouse-repopulating stem cells, None) , ( cell type: human progenitors, None) 