1730
Co-stimulation of T-lymphocytes by T-cell receptor ( TcR ) occupancy and activation of the CD28 surface molecule results in enhanced proliferation and interleukin 2 ( IL-2 ) production .
 ( cell type: T-lymphocytes, None) , ( protein: interleukin 2, None) , ( protein: T-cell receptor, None) , ( protein: IL-2, None) , ( protein: TcR, None) , ( protein: CD28 surface molecule, None) , ( protein: CD28, 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 type: T-lymphocytes, None) , ( protein: interleukin 2, None) , ( protein: T-cell receptor, None) , ( protein: IL-2, None) , ( protein: TcR, None) , ( protein: CD28 surface molecule, None) , ( protein: CD28, None) 