Alterations were slight , except in a single rat with pronounced alterations in the lymphoid system : The Peyer ´s patches had a slight decrease of germinal centers in some rats .
Alterations were slight , except in a single rat with pronounced alterations in the lymphoid system : The Peyer ´s patches had a slight decrease of germinal centers in some rats .
O O O O O O O O O O B-FINDING I-FINDING O O B-SPECIMEN I-SPECIMEN O O O O O O O O B-FINDING I-FINDING I-FINDING I-FINDING O O O O