title: The ultrastructure of testicular spermatozoa in two species of Rana.
mesh_terms: D000818:Animals; D001001:Anura; D002467:Cell Nucleus; D002479:Inclusion Bodies; D008297:Male; D008854:Microscopy, Electron; D008928:Mitochondria; D011894:Rana pipiens; D011898:Ranidae; D012708:Sertoli Cells; D013094:Spermatozoa / Q000166:cytology*; D013737:Testis