9548
We show here that in the early phases of apoptosis , pRB is posttranslationally modified by a tissue transglutaminase ( tTG )-catalyzed reaction .
 ( protein: tTG, None) , ( protein: pRB, 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: tTG, None) , ( protein: pRB, None) 