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Blood vessel diameters, cell types, and compositions. Capillaries are typically made up of pericytes surrounding an extracellular lining. Arterioles and venules are surrounded by smooth muscle cells. Arteries and veins consist of fibroblasts surrounding a layer of smooth muscle cells. Reprinted with permission from Nat. Sci. Rep. (Schöneberg et al., 2018), c 2021.
