MicromanipulationMicrodissectionLaser Capture MicrodissectionLasersDissectionGrasshoppersSpermatocytesZona PellucidaEmbryo TransferFertilization in VitroChromosomesNuclear Transfer TechniquesMicroscopy, InterferenceTwins, MonozygoticClone CellsZygoteSpermatozoaPolymerase Chain ReactionSewageMicroinjectionsSpindle ApparatusBlastocystHistocytological Preparation TechniquesEmbryonic and Fetal DevelopmentCryopreservationPregnancySperm Injections, IntracytoplasmicEmbryo, MammalianSperm RetrievalGene Expression ProfilingBiophysicsOocytesMolecular Sequence DataOligonucleotide Array Sequence AnalysisReverse Transcriptase Polymerase Chain ReactionParaffin EmbeddingTime Factors