SpermatocytesSpermatogenesisTestisSpermatidsSpermatogoniaSertoli CellsMeiosisSpermatozoaSeminiferous TubulesSalamandridaeSeminiferous EpitheliumProphaseInfertility, MaleSperm CountLeydig CellsGerm CellsY ChromosomePachytene StageOligospermiaCryptorchidismChromosomesFertilityDrosophila melanogasterSexual MaturationDrosophila ProteinsMeiotic Prophase IOrgan SizeImmunohistochemistryFollicle Stimulating HormoneMolecular Sequence DataCell NucleusGenes, InsectIn Situ HybridizationDrosophilaRNA, MessengerSynaptonemal ComplexGene Expression Regulation, DevelopmentalBase SequenceTestosteroneNuclear ProteinsChromosome PairingAmino Acid SequenceMicroscopy, ElectronOrgan SpecificityBlood-Testis BarrierOocytesGene ExpressionFluorescent Antibody TechniqueTranscription, GeneticMutationDipteraCell DifferentiationApoptosisDNABlotting, WesternMetaphaseSex ChromosomesTime FactorsTriethylenemelamine