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.
 ( RNA: C/EBP epsilon mRNA, None) , ( cell line: NB4 cells, 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:
 ( RNA: C/EBP epsilon mRNA, None) , ( cell line: NB4 cells, None) 