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| 12. Digestive System | ||
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Mouse colon stained with toluidine blue and silver.
The bottoms of the crypts are seen next to the muscularis mucosa (M) below. The lumen of the colon is at the top of the image. Among the differentiating epithelial cells of the crypts are endocrine cells showing reddish-brown secretory granules (arrows). At the tops of the crypts, the goblet cells are fully differentiated and their granules are stained blue (*). Between the goblet cells (*) the fully differentiated enterocytes (+) show their striated borders intensely stained blue-green. Stain: Silver, toluidine blue
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