SpermatogenesisTestisSpermatidsSpermatocytesSeminiferous TubulesSertoli CellsSpermatogoniaSpermatozoaInfertility, MaleSeminiferous EpitheliumSperm CountOligospermiaFertilityAzoospermiaBlood-Testis BarrierGerm CellsMeiosisTestosteroneNerve BlockContraceptive Agents, MaleLeydig CellsEpididymisHeart BlockCryptorchidismOrgan SizeSpermatogenesis-Blocking AgentsPachytene StageSperm MotilityFollicle Stimulating HormoneSexual MaturationAntispermatogenic AgentsMolecular Sequence DataChromosomes, Human, YTesticular DiseasesProtaminesSperm TailSperm MaturationY ChromosomeGene Expression Regulation, DevelopmentalSertoli Cell-Only SyndromeSperm HeadVaricoceleMeiotic Prophase IRNA, MessengerAcrosomeGonadotropinsOogenesisSeminal VesiclesBase SequenceAmino Acid SequenceGametogenesisMice, KnockoutLuteinizing HormoneImmunohistochemistryInhibinsSemenSeminal Plasma ProteinsGenitalia, MaleMice, Inbred C57BLReverse Transcriptase Polymerase Chain ReactionHaploidyIn Situ HybridizationDisorders of Sex DevelopmentCyclic AMP Response Element ModulatorHypogonadismAndrogensMutationGene ExpressionRNA-Binding ProteinsReceptors, FSHGene Expression RegulationCell DifferentiationMice, Mutant StrainsRats, Sprague-DawleyNuclear ProteinsSex ChromosomesCyclin A1AnguillaApoptosisMice, TransgenicSemen AnalysisReproductionSex Chromosome Disorders of Sex DevelopmentBundle-Branch BlockFertility Agents, MaleProteinsSperm RetrievalOrgan SpecificityLepidiumDrosophila ProteinsKlinefelter SyndromeX ChromosomeGonadotropin-Releasing HormoneAcrosinTesticular NeoplasmsVasectomyDNA-Binding ProteinsEelsTranscription FactorsStem Cells