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Ovulation and developmental capacity of Ddr2slie/slie oocytes. A: significantly fewer oocytes were ovulated in Ddr2slie/slie mutant compared with wild type (+/+) after injection with PMSG + hCG. B: some in vitro fertilization oocytes from Ddr2slie/slie mutant mice developed from one-cell to blastocyst. *P < 0.01.
