In Vitro Oocyte Maturation TechniquesOocytesEmbryo Culture TechniquesOogenesisMetaphaseSpindle ApparatusMeiosisMicrotubulesAnaphaseMitosisKinetochoresKinesinDipodomysChromosomesOvumChromosome SegregationMuscle SpindlesCentrosomeChromatidsTubulinMicrotubule-Associated ProteinsCell ExtractsNocodazoleCumulus CellsMaturation-Promoting FactorCDC2 Protein KinaseProto-Oncogene Proteins c-mosFertilizationXenopus laevisCell Cycle ProteinsGenes, mosMicroscopy, Fluorescence