SpermatocytesSpermatogenesisHaploidySpermatidsTestisMeiosisSertoli CellsSpermatozoaPachytene StageSpermatogoniaSeminiferous TubulesDiploidySeminiferous EpitheliumMeiotic Prophase ISynaptonemal ComplexChromosome PairingProphaseInfertility, MaleChromosomesBlood-Testis BarrierGerm CellsSperm CountMolecular Sequence DataMetaphaseSex ChromosomesBase SequenceDipteraY ChromosomeFertilityLeydig CellsPloidiesRNA, MessengerAmino Acid SequenceMutationSaccharomyces cerevisiaeTriethylenemelamineOligospermiaCell NucleusIn Situ HybridizationRecombination, GeneticSalamandridaeEpididymisImmunohistochemistryCloning, MolecularGene Expression Regulation, DevelopmentalOrthopteraCrosses, GeneticSex ChromatinNuclear ProteinsChromosome MappingGrasshoppersGenes, Mating Type, FungalAcrosomeOrgan SizeGametogenesisOncogene Proteins v-mosHistonesCryptorchidismSexual MaturationParthenogenesisMicroscopy, ElectronDNACyclin A1Blotting, NorthernAnaphaseTesticular DiseasesDrosophila melanogasterGene ExpressionMitosisSperm TailTestosteroneSpindle ApparatusPhenotypeDrosophila ProteinsCentromereCrossing Over, GeneticRats, Sprague-DawleyAneuploidyChromosome SegregationEthylene GlycolsOocytesDNA, ComplementaryTranscription, GeneticProtaminesAllelesCell Cycle ProteinsDNA, FungalX ChromosomeSperm HeadSequence Homology, Amino AcidOrgan SpecificityPheromonesContraceptive Agents, MaleGravity, AlteredAcrosinDNA-Binding ProteinsMicrotubulesMice, Inbred C57BLIn Situ Nick-End LabelingChromosomal Proteins, Non-Histone