In Vitro Oocyte Maturation TechniquesOocytesOogenesisEmbryo Culture TechniquesKinetochoresMeiosisMetaphaseSpindle ApparatusCumulus CellsXenopus laevisGenes, mosMaturation-Promoting FactorFertilizationXenopusProto-Oncogene Proteins c-mosChromosome SegregationMitosisOvarian FollicleMicrotubulesMad2 ProteinsMicroinjectionsHydroxyprogesteronesEmbryonic DevelopmentOvaryOocyte DonationXenopus ProteinsProgesteroneOvumFertilization in VitroStarfishChorionic GonadotropinOocyte RetrievalChromosomesBlastocystOvulationParthenogenesisAnaphaseCentromereCell Cycle Proteins