6609
Transcriptional targeting of retroviral vectors to the erythroblastic progeny of transduced hematopoietic stem cells .
 ( cell line: transduced hematopoietic stem cells, None) , ( cell type: erythroblastic progeny, 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:
 ( cell line: transduced hematopoietic stem cells, None) , ( cell type: erythroblastic progeny, None) 