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The mesenteric lymph node of a male rhesus macaque collected at day 8 following irradiation at 12 Gy has numerous myeloperoxidase (MPO)-positive cells within subcapsular sinuses (arrow), indicating migration of MPO-positive cells from the intestine. Note the sparse cellularity of the cortex (*) resulting from radiation-associated depletion of lymphoid cellular elements. MPO IHC stain, 10x objective magnification.
