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Cover: Muscle blood flow through capillaries responds to exercise training. Recent research in applied physiology has tracked this response at the molecular level (gene regulation of vascular endothelial growth factor) by the proliferation of capillaries surrounding muscle fibers and the integrated response of muscle O2 delivery. DNA image created by Paul A. Thiessen with Persistence of Vision Raytracer and PovChem (see http://www.ChemicalGraphics.com).
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