2214
IL-2 secretion was increased more than twofold in both Jurkat T cells and primary T cells stimulated by extracellular HIV-1 Tat protein .
 ( protein: extracellular HIV-1 Tat protein, None) , ( protein: HIV-1 Tat, None) , ( cell line: Jurkat T cells, None) , ( cell line: primary T cells, None) , ( protein: IL-2, 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: extracellular HIV-1 Tat protein, None) , ( protein: HIV-1 Tat, None) , ( cell line: Jurkat T cells, None) , ( cell line: primary T cells, None) , ( protein: IL-2, None) 