1853
By contrast, the MAP kinases ERK1 and ERK2 were fully activated by TPA or TCR stimulation and were not affected by Ca2+ , CD28, or CsA .
 ( protein: ERK1, None) , ( protein: ERK2, None) , ( protein: MAP kinases, None) , ( protein: TCR, 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: ERK1, None) , ( protein: ERK2, None) , ( protein: MAP kinases, None) , ( protein: TCR, None) 