SpermatogenesisTestisSpermatidsSpermatocytesSeminiferous TubulesSertoli CellsSpermatogoniaSpermatozoaInfertility, MaleQuality of LifeSeminiferous EpitheliumSperm CountFertilityOligospermiaAzoospermiaBlood-Testis BarrierGerm CellsMeiosisTestosteroneContraceptive Agents, MaleLeydig CellsEpididymisCryptorchidismOrgan SizeSpermatogenesis-Blocking AgentsPachytene StageSperm MotilityFollicle Stimulating HormoneLifeSexual MaturationAntispermatogenic AgentsTesticular DiseasesChromosomes, Human, YProtaminesSperm TailSperm MaturationY ChromosomeGene Expression Regulation, DevelopmentalSertoli Cell-Only SyndromeSperm HeadVaricoceleMeiotic Prophase IMolecular Sequence DataAcrosomeRNA, MessengerGonadotropinsSeminal VesiclesOogenesisGametogenesisLuteinizing HormoneInhibinsMice, KnockoutSemenImmunohistochemistryGenitalia, MaleSeminal Plasma ProteinsBase SequenceAmino Acid SequenceHaploidyDisorders of Sex DevelopmentReverse Transcriptase Polymerase Chain ReactionHypogonadismMice, Inbred C57BLCyclic AMP Response Element ModulatorReproductionIn Situ HybridizationAndrogensRNA-Binding ProteinsReceptors, FSHMice, Mutant StrainsSex ChromosomesAnguillaGene ExpressionCyclin A1Semen AnalysisSex Chromosome Disorders of Sex DevelopmentGene Expression RegulationFertility Agents, MaleMice, TransgenicCell DifferentiationNuclear ProteinsSperm RetrievalLepidiumOrgan SpecificityKlinefelter SyndromeMutationLife Change EventsX ChromosomeTesticular NeoplasmsRats, Sprague-DawleyDrosophila ProteinsAcrosinGonadotropin-Releasing HormoneVasectomyEelsProteinsStem CellsApoptosisDrosophila melanogasterTime Factors