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A schematic (upper panel) and example of immunohistochemical-stained microcirculation of the spinotrapezius muscle of the rat. The capillaries line up longitudinally along the muscle fibers. Larger terminal arterioles (blue arrow, lower panel) cross the fiber from top to bottom, as do the draining venules (white arrows). Multiple capillaries branch off each arteriole and venule. (A high-quality digital representation of this figure is available in the online issue.)
