11555
Expression of the HIV-1 transactivator Tat recapitulated this phenotype and was associated with increased IL-2 secretion in response to costimulation with CD3 plus CD28 .
 ( protein: Tat, None) , ( protein: CD28, None) , ( protein: IL-2, None) , ( protein: HIV-1 transactivator, None) , ( protein: CD3, 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: Tat, None) , ( protein: CD28, None) , ( protein: IL-2, None) , ( protein: HIV-1 transactivator, None) , ( protein: CD3, None) 