AzoospermiaTestisOligospermiaSperm RetrievalSpermatogenesisInfertility, MaleChromosomes, Human, YSpermatozoaTesticular DiseasesSperm CountSeminal Plasma ProteinsSperm Injections, IntracytoplasmicSpermatidsSertoli CellsY ChromosomeSex Chromosome Disorders of Sex DevelopmentSex Chromosome AberrationsKlinefelter SyndromeEpididymisVasovasostomyMicrosurgerySemenVasectomyRete TestisCryptorchidismContraceptive Agents, MaleSperm MotilityReproductive TechniquesSequence Tagged SitesTestosteroneSemen AnalysisVaricoceleVas DeferensFollicle Stimulating HormoneSuctionXYY KaryotypeEjaculationTissue and Organ HarvestingCryopreservationEjaculatory DuctsChromosome DeletionGenetic LociEmbryo TransferSpermatogoniaPregnancy RateSemen PreservationBiopsyMicroinjectionsFertilization in VitroFertilityTesticular NeoplasmsSpermatocytesSperm MaturationPregnancyLeydig CellsEpitestosteroneInhibinsEpididymitisTuberculosis, Male GenitalGonadal Dysgenesis, MixedAsthenozoospermiaRNA-Binding ProteinsLuteinizing HormonePregnancy OutcomeGene DeletionGenital Diseases, MaleAbnormal KaryotypeKaryotypingGerm CellsSeminiferous TubulesDesogestrelHypogonadismReproductive Techniques, AssistedSeminiferous EpitheliumMeiosisAdrenal Rest TumorFertilizationOstomyInfertilityMyoclonic Epilepsies, ProgressiveSpecimen HandlingGlycerylphosphorylcholineBase SequenceChromosome AberrationsKaryotypeMolecular Sequence DataMicrodissectionMicromanipulation