title: Mapping of mitochondrial 4 S RNA genes in Xenopus laevis by electron microscopy.
mesh_terms: D000818:Animals; D002874:Chromosome Mapping; D004272:DNA, Mitochondrial; D005796:Genes; D008854:Microscopy, Electron; D009693:Nucleic Acid Hybridization; D012313:RNA / Q000235:genetics*; D014981:Xenopus / Q000235:genetics*
chemical_list: D004272:DNA, Mitochondrial; D012313:RNA