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Normal histology of the gastrointestinal tract of M2−/−M3−/− mice. Sections of the stomach (A, D), jejunum (B, E), and ileum (C,F), stained with hematoxylin and eosin. Note that the diameter of the lumen and morphology of the muscular or mucosal layers are indistinguishable between the wild-type (A–C) and the M2−/−M3−/− (D–F) mice. Scale bars, 0.5 mm.
