Normal colon epithelium. (a) Mosaic image of normal crypts, which are circular and evenly distributed. Although the epithelium is relatively dark compared to the bright stroma, the thickness is very regular with uniform crypt structures. (b) Single crypt opening, slightly slit-like but with abundant goblet structures (dark “dots” within the epithelial cells). (c) Capillary vasculature typically seen very early in the injection. The vessels are small (<10 mm) in diameter and form a regular capillary network.
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