title: Spermatogenesis in a nematode Nippostrongylus brasiliensis.
mesh_terms: D000818:Animals; D005614:Freeze Fracturing; D008297:Male; D008854:Microscopy, Electron; D009559:Nippostrongylus / Q000502:physiology* / Q000648:ultrastructure; D051381:Rats; D013091:Spermatogenesis; D013094:Spermatozoa / Q000254:growth & development / Q000648:ultrastructure