title: Variation in rDNA redundancy level and nucleolar organizer length in normal and variant lines of the Mexican axolotl.
mesh_terms: D000557:Ambystoma / Q000196:embryology*; D000818:Animals; D002466:Cell Nucleolus; D002499:Centrifugation, Density Gradient; D002875:Chromosomes; D003433:Crosses, Genetic; D004247:DNA / Q000032:analysis*; D004625:Embryo, Nonmammalian / Q000166:cytology; D005260:Female; D005796:Genes; D014644:Genetic Variation; D005838:Genotype; D008297:Male; D009154:Mutation; D009693:Nucleic Acid Hybridization; D012335:RNA, Ribosomal; D012270:Ribosomes / Q000032:analysis*; D013053:Spectrophotometry; D014981:Xenopus
chemical_list: D012335:RNA, Ribosomal; D004247:DNA