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The mesenteric lymph node of a male rhesus macaque collected at day 130 following irradiation at 11 Gy has a pronounced increase in the amount of collagenous tissue (arrow) surrounding vascular tracts in the medulla. An increased amount of faintly stained collagenous tissue is discernible in the cortex (*). Densely stained collagenous tissue at the right margin of the image is the normal fibrous capsule of the lymph node. Collagen 1 IHC stain, 5x objective magnification.
