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Histological sections belonging to bottlenose (A) and Risso’s dolphin (B) forestomach show similarity in the layers’ structures, with more pronounced and deeper development of chorion papillae in Risso’s dolphin than in bottlenose dolphin. Note that the keratinized layer is more pronounced in bottlenose than in Risso’s dolphin. H&E stain; bar = 250 µm.
