2495
Although many second messengers have been shown to be necessary and sufficient for T cell activation in a number of model systems, the rate-limiting step in peripheral T cells has not been demonstrated.
 ( cell type: T cell, None) , ( cell type: peripheral T cells, 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 cell, None) , ( cell type: peripheral T cells, None) 