title: Ultracentrifuge and electron microscope studies on the structure of mitochondrial DNA.
mesh_terms: D000818:Animals; D001001:Anura; D004247:DNA / Q000032:analysis*; D004279:DNA, Viral; D005260:Female; D006863:Hydrogen-Ion Concentration; D008854:Microscopy, Electron; D008928:Mitochondria; D009691:Nucleic Acid Denaturation; D010063:Ovum / Q000166:cytology; D011120:Polyomavirus; D014461:Ultracentrifugation
chemical_list: D004279:DNA, Viral; D004247:DNA