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Proportion of ΔmtDNA in oocytes collected at different ages. Mito-mice were superovulated twice and oocytes were collected from left and right oviducts at 44 and 117 days old, respectively. Proportion of ΔmtDNA in oocytes is indicated by blue diamonds. Red crosses indicate the proportions of ΔmtDNA in the tails of oocyte-donor mito-mice at 30 days old.
