In Vitro Oocyte Maturation TechniquesOocytesEmbryo Culture TechniquesOogenesisCumulus CellsBlastocystEmbryonic DevelopmentFertilization in VitroMeiosisCleavage Stage, OvumOvarian FollicleOocyte RetrievalEctogenesisParthenogenesisEmbryo TransferMetaphaseFertilizationOocyte DonationPolar BodiesFollicular FluidCryopreservationSperm Injections, IntracytoplasmicCattleEmbryonic and Fetal DevelopmentXenopus laevisNuclear Transfer TechniquesOvaryZygoteMorulaEmbryo, MammalianPregnancyChorionic GonadotropinVitrificationXenopusMaturation-Promoting FactorFollicle Stimulating HormoneGenes, mos