1250
In this study, co-operative interactions between all-trans and 9-cis RA and D3 which promote neutrophil and monocyte differentiation of HL60 cells have been analysed in detail.
 HL60 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:
 HL60 cells