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Relative mRNA abundance of genes encoding ubiquitylation (A) and deubiquitylation (B) enzymes in porcine oocytes and embryos at different stages of development. OO, MII oocytes; D2, day 2 embryos; D4, day 4 embryos; D7, day 7 blastocysts. Different letters indicate statistical differences (p < 0.05) between developmental stages.
