9259
Our studies showed that levels of C/EBP epsilon mRNA were markedly increased in NB4 cells ( promyelocytic leukemia line ), because they were induced by 9-cis retinoic acid ( 9-cis RA ) to differentiate towards granulocytes .
 ( cell type: granulocytes, None) , ( cell line: promyelocytic leukemia line, None) , ( cell line: NB4 cells, None) , ( RNA: C/EBP epsilon mRNA, 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:
 ( cell type: granulocytes, None) , ( cell line: promyelocytic leukemia line, None) , ( cell line: NB4 cells, None) , ( RNA: C/EBP epsilon mRNA, None) 