10457
The monomeric polypeptide Flexi-12 is able to induce the proliferation of phytohemagglutinin ( PHA ) blasts , induce PHA blasts to secrete interferon-gamma ( IFN-gamma ) and additionally, by preincubation, enhance the killing of K562 targets by PBLs .
 ( protein: phytohemagglutinin, None) , ( protein: PHA, None) , ( cell line: phytohemagglutinin ( PHA ) blasts, None) , ( cell line: PHA blasts, None) , ( protein: PHA, None) , ( protein: IFN-gamma, None) , ( cell type: PBLs, None) , ( protein: Flexi-12, None) , ( protein: interferon-gamma, 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:
 ( protein: phytohemagglutinin, None) , ( protein: PHA, None) , ( cell line: phytohemagglutinin ( PHA ) blasts, None) , ( cell line: PHA blasts, None) , ( protein: PHA, None) , ( protein: IFN-gamma, None) , ( cell type: PBLs, None) , ( protein: Flexi-12, None) , ( protein: interferon-gamma, None) 