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Part of an islet from a non-diabetic patient viewed with electron microscopy demonstrating the presence of insulin-containing β-cells (β), α-cells (α), and δ-cells (δ) all close to the peripheral capillary (cap). A large proportion of β-cells are not situated adjacent or near to a capillary in this thin section. l, lipofuscin body; n, nucleus. Scale, 5 μm.
