TestisKlinefelter SyndromeSpermatogenesisInfertility, MaleRete TestisSertoli CellsCryptorchidismLeydig CellsSpermatidsSpermatozoaSpermatogoniaEpididymisSeminiferous EpitheliumTesticular DiseasesTestosteroneSpermatocytesTesticular NeoplasmsSperm CountOrgan SizeSpermatic Cord TorsionGerm CellsOrchitisGenitalia, MaleSexual MaturationScrotumMolecular Sequence DataRNA, MessengerBlood-Testis BarrierTissue DistributionSex DifferentiationOrgan SpecificityAmino Acid SequenceBase SequenceImmunohistochemistryOrchiectomy