10567
PO-B was originally characterized as a transcriptional regulatory factor of the pro-opiomelanocortin (POMC) gene ; however, it has become increasingly clear that this protein may be active in tissues outside the pituitary , since it is present in diverse cell types, including differentiated HL-60 promyelocytic leukemia cells .
 ( cell type: HL-60 promyelocytic leukemia cells, None) , ( protein: transcriptional regulatory factor, None) , ( protein: PO-B, None) , ( DNA: pro-opiomelanocortin (POMC) gene, 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: HL-60 promyelocytic leukemia cells, None) , ( protein: transcriptional regulatory factor, None) , ( protein: PO-B, None) , ( DNA: pro-opiomelanocortin (POMC) gene, None) 