5087
The present study, using highly enriched human CD34+ as well as Lin- murine bone marrow progenitor cells , demonstrates a potent inhibitory effect of 9-cis-RA on burst-forming unit-erythroid (BFU-E) colony formation regardless of the cytokine stimulating growth .
 ( protein: cytokine, None) , ( protein: human CD34+, None) , ( cell line: Lin- murine bone marrow progenitor cells, 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: cytokine, None) , ( protein: human CD34+, None) , ( cell line: Lin- murine bone marrow progenitor cells, None) 