title: Use of chromatofocusing for separation of beta-lactamases. IV. Beta-lactamases of the E. coli K12 strain carrying RP4 plasmid.
mesh_terms: D001426:Bacterial Proteins / Q000032:analysis; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics; D007525:Isoelectric Focusing / Q000379:methods; D010957:Plasmids; D001618:beta-Lactamases / Q000302:isolation & purification*
chemical_list: D001426:Bacterial Proteins; D001618:beta-Lactamases