6831
Th2 cells could be induced in all healthy controls by priming with anti-CD28 in the absence of TCR ligation .
 ( cell line: Th2 cells, None) , ( protein: anti-CD28, None) , ( protein: TCR, 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: Th2 cells, None) , ( protein: anti-CD28, None) , ( protein: TCR, None) 