title: Size of ribosomal DNA repeating units in Xenopus laevis: limited individual heterogeneity and extensive population polymorphism.
mesh_terms: D000818:Animals; D004247:DNA / Q000032:analysis*; D004587:Electrophoresis, Agar Gel; D004912:Erythrocytes; D005260:Female; D005796:Genes; D008297:Male; D008854:Microscopy, Electron; D008970:Molecular Weight; D011110:Polymorphism, Genetic; D012270:Ribosomes / Q000032:analysis*; D014981:Xenopus
chemical_list: D004247:DNA