14635
Groups 1 and 2 have a serine-rich region and an " arginine element " ( RRLPIF ) at the carboxyl terminus .
 ( protein: carboxyl terminus, None) , ( protein: serine-rich region, None) , ( protein: arginine element, None) , ( protein: RRLPIF, 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: carboxyl terminus, None) , ( protein: serine-rich region, None) , ( protein: arginine element, None) , ( protein: RRLPIF, None) 