SpermatocytesSpermatogenesisSpermatidsTestisMeiosisSertoli CellsPachytene StageSpermatogoniaSpermatozoaSeminiferous TubulesSeminiferous EpitheliumMeiotic Prophase ISynaptonemal ComplexProphaseChromosome PairingBlood-Testis BarrierInfertility, MaleSperm CountGerm CellsChromosomesDipteraLeydig CellsMetaphaseSex ChromosomesY ChromosomeFertilityTriethylenemelamineSalamandridaeOligospermiaEpididymisOrthopteraSex ChromatinImmunohistochemistryIn Situ HybridizationMolecular Sequence DataRNA, MessengerGrasshoppersOrgan SizeOncogene Proteins v-mosCryptorchidismSexual MaturationGene Expression Regulation, DevelopmentalCyclin A1Nuclear ProteinsAnaphaseTestosteroneRats, Sprague-DawleyHistonesEthylene GlycolsAcrosomeBase SequenceCell NucleusMicroscopy, ElectronDrosophila ProteinsAmino Acid SequenceDrosophila melanogasterContraceptive Agents, MaleGravity, AlteredHaploidyIn Situ Nick-End LabelingTesticular DiseasesAndrogen-Binding ProteinBlotting, Northern