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Electron microscopy image of mouse δ-cells (δ) to demonstrate the lozenge-shaped granules and potential intercellular communication between cells. Omega-shaped thickened membrane invaginations (arrows) at the intercellular margin are characteristic of membrane recovery following granule exocytosis. m, mitochondrion; er, endoplasmic reticulum; cap, capillary. Scale, 1 μm.
