title: Chemical basis for heterogeneity of ribosomal proteins.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D001426:Bacterial Proteins / Q000032:analysis*; D002499:Centrifugation, Density Gradient; D002850:Chromatography, Gel; D004589:Electrophoresis, Disc; D004926:Escherichia coli / Q000032:analysis*; D012270:Ribosomes / Q000032:analysis*
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins