title: Ultrastructural tail defects in the spermatozoa from two men attending a subfertility clinic.
mesh_terms: D000328:Adult; D001706:Biopsy; D006801:Humans; D007248:Infertility, Male / Q000209:etiology*; D008297:Male; D008854:Microscopy, Electron; D012661:Semen; D013094:Spermatozoa; D013737:Testis / Q000473:pathology