Beginning of Human LifePersonhoodHuman CharacteristicsJudaismLifeFertilizationValue of LifeFertilization in VitroHuman DevelopmentBioethical IssuesEthical TheoryReligion and MedicinePhilosophy, MedicalLongevityMoralsQuality of LifeEthics, MedicalPregnancy Reduction, MultifetalEmbryo ResearchCloning, OrganismBiological EvolutionSpermatozoaPregnancySperm-Ovum InteractionsAgingOvumOocytesEmbryo TransferZygoteZona PellucidaSperm Injections, IntracytoplasmicSperm MotilitySea UrchinsPregnancy RateAcrosomeCleavage Stage, OvumInfertility, FemaleFertilizersEmbryonic DevelopmentAcrosome ReactionSperm CapacitationCryopreservationBlastocystOvulation InductionInfertility, MaleInfertilityEgg ProteinsMicroinjectionsFertilityEmbryo ImplantationEmbryonic and Fetal DevelopmentTime FactorsVitelline MembraneLife Change EventsPregnancy OutcomeParthenogenesis