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Evidence for a purifying selection acting on the β-lactamase locus in epidemic clones of methicillin-resistant Staphylococcus aureus

Catarina Milheiriço, Ana Portelinha, Ludwig Krippahl, Hermínia de Lencastre and Duarte C Oliveira*

BMC Microbiology 2011, 11:76  doi:10.1186/1471-2180-11-76

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