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Relative abundance of the mtDNA4977 deletion in the vastus lateralis muscle of young and old participants. Differences among groups were assessed by one-way ANOVA. Bars represent mean values (±standard deviation) for the three experimental groups. Values are expressed in arbitrary units (a.u.). * p < 0.05 vs. young group (n = 11); HF: high-functioning (n = 16); LF: low-functioning (n = 7).
