Plasmid-Determined , B-Lactamase Indistinguishable from the Chromosomal , 3-Lactamase of Escherichia coli

Department of Biochemistry, University Medical School, Bialystok, Poland; Microbiology Department, Glaxo Research Ltd., Greenford, Middlesex, England; Department of Bacteriology, Royal Postgraduate Medical School, London, W12 OHS, England*; Department of Clinical Therapeutics, School of Medicine, University of Athens, Alexandra Hospital, Athens, Greece; and Microbiology Section, Department of Pharmaceutics, School of Pharmacy, University of London, London WClN 1AX, England

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