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Immunohistochemistry for 5-HT. The distribution of 5-HT–positive cells in the guinea pig pancreas was examined with mouse anti-serotonin mAb. The majority of 5-HT–immunoreactive cells are present in the islet of Langerhans (a). They are also present in the epithelium of the main (b), larger (c), and smaller (d) interlobular ducts and in acini (a). Bar, 5 μm.
