title: Substructure of the cortical singlet microtubules in spermatozoa of Macrostomum (Platyhelminthes, Turbellaria) as revealed by negative staining.
mesh_terms: D008297:Male; D008854:Microscopy, Electron; D013094:Spermatozoa / Q000166:cytology; D013194:Staining and Labeling; D014419:Turbellaria / Q000166:cytology*