1676
Correlation of differentiation-inducing activity of retinoids on human leukemia cell lines HL-60 and NB4 .
 HL-60, human leukemia cell lines, NB4
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, human leukemia cell lines, NB4