Electron microscopy using antiglucagon or antiglicentin antisera and the protein A-gold (pAg) technique revealed a population of immunoreactive cells in the gastric mucosa of human fetuses. The secretory granules of these cells showed the same ultrastructural characteristics and the same labeling pattern as pancreatic α-granules. These data demonstrate that the stomach of human fetuses contains cells with secretory granules indistinguishable by morphologic and immunocytochemical criteria from the pancreatic Acells.

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