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 .
 HL-60 promyelocytic leukemia cells, transcriptional regulatory factor, PO-B, pro-opiomelanocortin (POMC) gene
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:
 HL-60 promyelocytic leukemia cells, transcriptional regulatory factor, PO-B, pro-opiomelanocortin (POMC) gene