title: Ultrastructural observations on the acrosome of Lumbricus terrestris.
mesh_terms: D000818:Animals; D000845:Annelida / Q000032:analysis / Q000166:cytology* / Q000254:growth & development; D002467:Cell Nucleus; D008297:Male; D008854:Microscopy, Electron; D010434:Pepsin A; D013094:Spermatozoa / Q000166:cytology*; D013194:Staining and Labeling
chemical_list: D010434:Pepsin A