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Comparison of cell types and structures between the mammalian (A) and zebrafish (B) gastrointestinal tract. The zebrafish intestine is organized into irregular folds as opposed to villi, and lacks crypts. Mammalian and zebrafish intestines share stem cells, enterocytes, enteroendocrine cells, and goblet cells. Paneth cells and M-cells are absent in zebrafish.
