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mtDNA to nDNA ratios in livers of C57BL/6, BALB/c, and F1 hybrids. A significant difference (P < 0.01) existed between C57BL/6 and BALB/c mice. The mtDNA to nDNA ratios of the F1 hybrids were higher than those of BALB/c mice but lower than those of C57BL/6 mice.
