4740
Reversible differentiation of human monoblastic leukemia U937 cells by ML-9 , an inhibitor of myosin light chain kinase .
 myosin light chain kinase, human monoblastic leukemia U937 cells
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:
 myosin light chain kinase, human monoblastic leukemia U937 cells