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Colocalisation of 5-HT with secretin and CCK in enteroendocrine cells of the mouse duodenum. Examples of 5-HT cells that do not contain either of these peptide hormones (unlabeled arrows), 5-HT plus secretin (✱) and 5-HT plus both CCK and secretin (★) are illustrated. In the merged image cell nuclei are stained by DAPI (blue). Scale bars: 10 μm.
