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 ) .
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 ) .
O O O O O B-tissue I-tissue O O O O O O O O B-tissue I-tissue I-tissue I-tissue O O B-tissue I-tissue I-tissue I-tissue B-tissue O O O O O O O O O O B-tissue I-tissue O O O O O O B-tissue I-tissue I-tissue O O O O O O O O O O B-tissue I-tissue O O