13675
However, the cells obtained from IL-2 -treated patients did not have low-level constitutive expression of STAT binding factors as did LAK cells .
 ( protein: IL-2, None) , ( protein: STAT binding factors, None) , ( protein: LAK cells, 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: IL-2, None) , ( protein: STAT binding factors, None) , ( protein: LAK cells, None) 