title: Fine structure and morphogenesis of "headless" human spermatozoa associated with infertility.
mesh_terms: D006801:Humans; D007248:Infertility, Male / Q000473:pathology*; D008297:Male; D008854:Microscopy, Electron; D009024:Morphogenesis; D013077:Sperm Head / Q000648:ultrastructure*; D013094:Spermatozoa / Q000648:ultrastructure*