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The colonic lymphoid follicle (lymphoglandular complex) of a rhesus macaque at day 37 following irradiation at 11 Gy has markedly reduced cellularity, with no discernible germinal centers. Corticosteroid administration as part of medical management had not commenced at this time in the study, thus the observed changes were unequivocally radiation-related. H&E stain, 10x objective magnification.
