9131
A unique subclone of a bone marrow-derived stromal cell line , BMS2.4 , produces soluble factors that inhibit proliferation of several types of hematopoietic cell lines .
 ( protein: soluble factors, None) , ( cell line: hematopoietic cell lines, None) , ( cell line: BMS2.4, None) , ( cell line: bone marrow-derived stromal cell line, 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: soluble factors, None) , ( cell line: hematopoietic cell lines, None) , ( cell line: BMS2.4, None) , ( cell line: bone marrow-derived stromal cell line, None) 