5088
Specifically, 9-cis-RA potently inhibited the growth of BFU-E response to erythropoietin ( Epo ) (100%), stem cell factor ( SCF ) + Epo (92%), IL-3 + Epo (97%), IL-4 + Epo (88%), and IL-9 + Epo (100%).
 Epo, IL-9, Epo, IL-3, erythropoietin, SCF, Epo, Epo, Epo, IL-4, stem cell factor
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:
 Epo, IL-9, Epo, IL-3, erythropoietin, SCF, Epo, Epo, Epo, IL-4, stem cell factor