Genetic defects.
D005832:Genital Diseases, Male / Q000235:genetics*; D006065:Gonadotropins, Pituitary / Q000172:deficiency; D006801:Humans; D007248:Infertility, Male / Q000209:etiology*; D008297:Male; D012729:Sex Chromosome Aberrations / Q000150:complications*; D013081:Sperm Motility; D014649:Vas Deferens / Q000002:abnormalities; D014998:Y Chromosome
D006065:Gonadotropins, Pituitary