Germ CellsSpermatogenesisMeiosisSpermatozoaTestisNeoplasms, Germ Cell and EmbryonalTesticular NeoplasmsGerminomaSertoli CellsSpermatogoniaSeminiferous TubulesSpermatocytesSpermatidsGonadsSeminomaMammalsMolecular Sequence DataGene Expression Regulation, DevelopmentalWheat Germ AgglutininsOogenesisOvarySeminiferous EpitheliumDysgerminomaAmino Acid SequenceGerm LayersGametogenesisBase SequenceTeratomaEmbryo, MammalianEndodermal Sinus TumorOogoniaRNA, MessengerSex DifferentiationOocytes