SpermatogenesisTestisSpermatidsSertoli CellsSpermatocytesSpermatogoniaSeminiferous TubulesSpermatozoaInfertility, MaleSeminiferous EpitheliumSperm CountRete TestisCryptorchidismLeydig CellsTestosteroneFertilityBlood-Testis BarrierGerm CellsOligospermiaAzoospermiaEpididymisMeiosisContraceptive Agents, MaleOrgan SizeTesticular DiseasesSexual MaturationSperm MotilityFollicle Stimulating HormonePachytene StageSpermatogenesis-Blocking AgentsMolecular Sequence DataRNA, MessengerTesticular NeoplasmsSperm MaturationGenitalia, MaleAntispermatogenic AgentsGene Expression Regulation, DevelopmentalSperm TailProtaminesY ChromosomeVaricoceleSeminal VesiclesSertoli Cell-Only SyndromeSperm HeadImmunohistochemistryChromosomes, Human, YBase SequenceAcrosomeAmino Acid SequenceLuteinizing HormoneInhibinsIn Situ HybridizationGonadotropinsReverse Transcriptase Polymerase Chain ReactionMeiotic Prophase IOrgan SpecificitySemenScrotumSpermatic Cord TorsionGametogenesisMice, KnockoutGene ExpressionSeminal Plasma ProteinsOogenesisReceptors, FSHAndrogensReproductionMice, Inbred C57BLRats, Sprague-DawleyHypogonadismGonadsSex Determination ProcessesOrchitisDNA, ComplementaryTissue DistributionCyclic AMP Response Element ModulatorHaploidyVasectomyRNA-Binding ProteinsAndrogen-Binding ProteinSex-Determining Region Y ProteinGene Expression RegulationSex DifferentiationBlotting, NorthernMice, Mutant StrainsCell DifferentiationMice, TransgenicOrchiectomyCloning, MolecularOvarySex ChromosomesNuclear ProteinsCyclin A1ProteinsX ChromosomeGonadotropin-Releasing HormoneSemen AnalysisDisorders of Sex DevelopmentSperm RetrievalKlinefelter Syndrome