8444
In human peripheral blood NK cells , genistein at <0.5 micromol/L and DG and GG at 0.1-10 micromol/L enhanced NK cell-mediated K562 cancer cell killing significantly (P < 0.05).
 ( cell type: human peripheral blood NK cells, None) , ( cell line: K562 cancer cell, 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 type: human peripheral blood NK cells, None) , ( cell line: K562 cancer cell, None) 