title: Germinal cell deficiency of the undescended testis: a congenital defect.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001706:Biopsy; D002648:Child; D002675:Child, Preschool; D003456:Cryptorchidism / Q000473:pathology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D011627:Puberty; D013094:Spermatozoa / Q000254:growth & development*; D013737:Testis / Q000473:pathology*