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Representative microphotographs of ghrelin-ip cells in the rat gastrointestinal tract[16]. A: Closed-type ghrelin cells (arrow) were found in the crypt of the duodenum; B: Opened-type ghrelin cells (arrow) in contact with the lumen were found in the villi of the duodenum. Bar = 10 μm. VI: Villi; LU: Lumen.
