3987
ATRA and 9-cis RA also exert their effect on the proliferation of primitive HPCs ( high-proliferative potential colony-forming cells [ HPP-CFCs ]) and putative hematopoietic stem cells ( HSCs ; assayed in Dexter-type long-term culture ).
 ( cell line: high-proliferative potential colony-forming cells, None) , ( cell type: primitive HPCs, None) , ( cell type: putative hematopoietic stem cells, None) , ( cell line: HPP-CFCs, None) , ( cell type: HSCs, None) , ( cell type: HPCs, 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: high-proliferative potential colony-forming cells, None) , ( cell type: primitive HPCs, None) , ( cell type: putative hematopoietic stem cells, None) , ( cell line: HPP-CFCs, None) , ( cell type: HSCs, None) , ( cell type: HPCs, None) 