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 .
 soluble factors, hematopoietic cell lines, BMS2.4, bone marrow-derived stromal cell line
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 soluble factors, hematopoietic cell lines, BMS2.4, bone marrow-derived stromal cell line