Summary
Intestinal argentaffin carcinoids, thought to originate from enterochromaffin cells, occasionally contain large amounts of substance P-like immunoreactivity in addition to 5-HT. The cytoplasmic granules of one such tumour were isolated. The granules, which in the electron microscope were shown to be argentaffin, contained both substance P-like immunoreactivity and 5-HT. The results support the view that substance P is localized in a population of enterochromaffin cells where it is stored in the cytoplasmic granules together with 5-HT.
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Alumets, J., Håkanson, R., Ingemansson, S. et al. Substance P and 5-HT in granules isolated from an intestinal argentaffin carcinoid. Histochemistry 52, 217–222 (1977). https://doi.org/10.1007/BF00495858
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DOI: https://doi.org/10.1007/BF00495858