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We demonstrate here that a third region encompassing a proline rich sequence within the 33 bp repetitive stretch of LMP1 's C-terminus is required for the activation of Janus kinase 3 ( JAK3 ).
 ( protein: Janus kinase 3, None) , ( protein: proline rich sequence, None) , ( protein: LMP1, None) , ( protein: C-terminus, None) , ( protein: JAK3, 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: Janus kinase 3, None) , ( protein: proline rich sequence, None) , ( protein: LMP1, None) , ( protein: C-terminus, None) , ( protein: JAK3, None) 