The fine structure of nuclei during spermiogenesis in the leopard frog, Rana pipiens.
D000818:Animals; D001001:Anura; D002467:Cell Nucleus; D008297:Male; D008854:Microscopy, Electron; D008928:Mitochondria; D013094:Spermatozoa / Q000166:cytology* / Q000254:growth & development