2725
PMA , but not Ara-C or ceramides , activated ERK MAPKS , in Jurkat and EL4 .
 ( cell line: EL4, None) , ( cell line: Jurkat, None) , ( protein: ERK MAPKS, 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 line: EL4, None) , ( cell line: Jurkat, None) , ( protein: ERK MAPKS, None) 