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The higher magnification of jejunum of a male rhesus macaque collected at day 20 following irradiation at 10 Gy reveals regenerative crypts (*) with submucosal edema (light pink-stained material), and extravasated erythrocytes (red particles). The submucosa has numerous large mononuclear cells (arrow) that are consistent with active fibroblasts or myofibroblasts. H&E stain, 10x objective magnification.
