8027
We found frequent hypermutation in follicular lymphoma (25 of 59 = 42%) ( germinal center cell origin ) and mucosa-associated lymphoid tissue ( MALT ) lymphoma (19 of 45 = 42%) ( postgerminal center ), but only occasionally in mantle cell lymphoma (1 of 21 = 4.8%) ( pregerminal center ).
 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:
 None