Blázquez, J A237T as a modulating mutation in naturally occurring extended-spectrum TEM-type beta-lactamases. [electronic resource] - Antimicrobial agents and chemotherapy May 1998 - 1042-4 p. digital Publication Type: Journal Article ISSN: 0066-4804 Standard No.: 10.1128/AAC.42.5.1042 doi Subjects--Topical Terms: Escherichia coli--enzymologyGenes, Bacterial--geneticsMicrobial Sensitivity TestsMutagenesis, Site-DirectedPhenotypebeta-Lactam Resistance--geneticsbeta-Lactamases--genetics