13205
A serum-independent HL60 cell line was induced towards the neutrophil lineage by treatment with all-trans retinoic acid ( ATRA ) for 24 h.
 serum-independent HL60 cell line, HL60 cell line
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:
 serum-independent HL60 cell line, HL60 cell line