9262
NB4 cells pulse-exposed (30 minutes) to all-trans retinoic acid ( ATRA ), washed, and cultured (3 days) with either dimethylsulfoxide ( DMSO ) or hexamethylene bisacetamide ( HMBA ) had a prominent increase in levels of C/EBP epsilon mRNA and an increase in granulocytic differentiation , but exposure to either DMSO or HMBA alone had no effect on base levels of C/EBP epsilon and did not induce differentiation.
 C/EBP epsilon mRNA, NB4 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:
 C/EBP epsilon mRNA, NB4 cells