In Vitro Oocyte Maturation TechniquesOocytesEmbryo Culture TechniquesOogenesisSpindle ApparatusMeiosisChromosomesMuscle SpindlesMetaphaseMicrotubulesChromosome SegregationChromosome MappingMitosisKinesinTubulinCentrosomeMicrotubule-Organizing CenterKinetochoresFertilizationOvumAnaphaseXenopus laevisPolar BodiesMicrotubule-Associated ProteinsMicroscopy, PolarizationNocodazoleX ChromosomeXenopus ProteinsChromosome BandingXenopusChromosome AberrationsParthenogenesisCumulus CellsCell Cycle ProteinsChromosomes, HumanProphaseMolecular Sequence DataSex ChromosomesMaturation-Promoting FactorAurora Kinases