SpermatocytesSpermatogenesisSpermatidsTestisMeiosisSertoli CellsPachytene StageSpermatogoniaSpermatozoaSeminiferous TubulesSeminiferous EpitheliumMeiotic Prophase ISynaptonemal ComplexProphaseChromosome PairingBlood-Testis BarrierInfertility, MaleGerm CellsSperm CountChromosomesDipteraLeydig CellsMetaphaseSex ChromosomesFertilityY ChromosomeMolecular Sequence DataTriethylenemelamineRNA, MessengerSalamandridaeImmunohistochemistryOrthopteraEpididymisIn Situ HybridizationOligospermiaBase SequenceSex ChromatinOrgan SizeAmino Acid SequenceGrasshoppersRats, Sprague-DawleyGene Expression Regulation, DevelopmentalOncogene Proteins v-mosSexual MaturationCryptorchidismNuclear ProteinsCyclin A1AnaphaseMicroscopy, ElectronTestosteroneCell NucleusHistonesDrosophila ProteinsDrosophila melanogasterEthylene GlycolsMice, Inbred C57BLAcrosomeGene ExpressionMutationBlotting, NorthernHaploidyMice, KnockoutIn Situ Nick-End LabelingContraceptive Agents, MaleGravity, AlteredCells, CulturedTesticular DiseasesSpindle ApparatusAndrogen-Binding Protein