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Disappearance of hexokinases bound to skeletal muscle mitochondria during aging of mice. (A) Contents of hexokinases I and II in mitochondria and cytosol. (B) Activities of hexokinases I and II in the mitochondria and cytosol. *P < 0.01; **P < 0.001 (mouse embryos, 12-, 24-, or 30-mo-old mice compared with 3-mo-old mice).
