title: Electron microscopic and optical diffraction studies of negatively stained axial units of certain platyhlminth sperm.
mesh_terms: D000818:Animals; D001001:Anura; D002462:Cell Membrane; D007834:Lasers; D008297:Male; D008722:Methods; D008854:Microscopy, Electron; D008870:Microtubules; D008928:Mitochondria; D055095:Optics and Photonics; D013094:Spermatozoa / Q000166:cytology; D013194:Staining and Labeling; D014200:Trematoda; D014419:Turbellaria