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Alignment of the ampC-ampR intercistronic region from the β-lactamase of the following strains: 1, O. anthropi SLO74; 2, P. aeruginosa PAO01; 3, P. stuartii VDG 96; 4, M. morganii SLM 01; 5, Y. enterocolitica IP 97; 6, C. freundii OS 60. The Lys-R motif is boxed.
