1251
Treatment of serum-free grown HL60 cells with 5 x 10(-7) M all-trans RA or 9-cis RA resulted in sub-optimal neutrophil differentiation (up to 25% mature cells).
 cell line: HL60 cells; cell line: serum-free grown HL60 cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: HL60 cells, serum-free grown HL60 cells 
Answer:
 cell line: HL60 cells; cell line: serum-free grown HL60 cells