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Changes in mtOCR per mtDNA copy number (mean) during preimplantation development of human embryos. The OCR/mtDNA ratio was defined as the value of mtOCR divided by the mtDNA copy number. The numbers of oocytes or embryos examined are shown in parentheses. Different superscript letters (a–c) indicate significant differences (P < 0.01) by Steel-Dwass following Kruskal-Wallis following ANOVA
