title: Length heterogeneity in a region of the human ribosomal gene spacer is not accompanied by extensive population polymorphism.
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000032:analysis*; D004262:DNA Restriction Enzymes / Q000378:metabolism; D005809:Genes, Regulator; D006801:Humans; D009693:Nucleic Acid Hybridization; D011110:Polymorphism, Genetic; D012270:Ribosomes / Q000032:analysis*
chemical_list: D004247:DNA; D004262:DNA Restriction Enzymes