title: A simple method for the preparation of sperm of external fertilizers for scanning electron microscopy.
mesh_terms: D000818:Animals; D002025:Bufonidae / Q000033:anatomy & histology; D005399:Fishes / Q000033:anatomy & histology; D006652:Histological Techniques; D008297:Male; D008855:Microscopy, Electron, Scanning; D012617:Sea Urchins / Q000033:anatomy & histology; D013094:Spermatozoa / Q000648:ultrastructure*; D014981:Xenopus / Q000033:anatomy & histology