In Vitro Oocyte Maturation TechniquesOocytesEmbryo Culture TechniquesOogenesisMeiosisChromosomesChromosome MappingMetaphaseCumulus CellsFertilizationXenopus laevisMaturation-Promoting FactorGenes, mosProto-Oncogene Proteins c-mosMicroinjectionsParthenogenesisEmbryonic DevelopmentBlastocystX ChromosomeChromosome BandingChromosome AberrationsOocyte DonationXenopusChromosome SegregationOvumOocyte RetrievalSperm-Ovum InteractionsOvaryFertilization in VitroSex ChromosomesOvarian Follicle