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Enterin in the digestive tract. A, Esophagus immunostaining. B, Esophagus in situ hybridization. C, Crop immunostaining.D, Crop in situ hybridization.E, Stomatogastric ring (arrow) immunostaining. The crop is below and triturating stomach is above thearrow. F, Filter chamber immunostaining. All panels are from 10–15 gm Aplysia. Scale bar (shown in F), 200 μm for all panels.
