1676
Correlation of differentiation-inducing activity of retinoids on human leukemia cell lines HL-60 and NB4 .
 ( cell line: HL-60, None) , ( cell line: human leukemia cell lines, None) , ( cell line: NB4, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell line: HL-60, None) , ( cell line: human leukemia cell lines, None) , ( cell line: NB4, None) 