4196
The induction of T cell proliferation requires signals from the TCR and a co-receptor molecule , such as CD28 , that activate parallel and partially cross-reactive signaling pathways .
 ( protein: TCR, None) , ( protein: CD28, None) , ( protein: co-receptor molecule, 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: TCR, None) , ( protein: CD28, None) , ( protein: co-receptor molecule, None) 