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Mature morphology and parthenogenetically activated embryonic development of yak COCs. (A) Immature COCs. (B) Mature COCs. (C) Mature oocytes excrete the first polar body (red arrow). (D–H) Respectively represent the activation of yak parthenogenetic embryos in the development of 2-cell, 4-cell, 8-cell, morula, and blastocyst stages; bar = 100 μm.
