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Morphometric properties relevant to oxygen supply in the heart for mole rats (hatched bars) and white rats (open bars). Mh, mass of the heart; VV(mt,f), mitochondrial volume density; JV(c,f), capillary length density; MYOGLOBIN, myoglobin content in heart muscle; mt, mitochondrial; c, capillary; and f, muscle fibers. Data are reported as mean ± SEM.
