402
In the present experiment, we examined the effect of nm23 proteins on various differentiation induction systems of human leukemic cells including HL-60 , U937 , HEL/S , KU812F , K562 , and HEL cells .
 ( cell line: HL-60, None) , ( cell line: KU812F, None) , ( cell line: HEL/S, None) , ( cell line: U937, None) , ( cell line: K562, None) , ( cell line: HEL, None) , ( cell type: human leukemic cells, None) , ( protein: nm23 proteins, 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: KU812F, None) , ( cell line: HEL/S, None) , ( cell line: U937, None) , ( cell line: K562, None) , ( cell line: HEL, None) , ( cell type: human leukemic cells, None) , ( protein: nm23 proteins, None) 