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Population analysis with nafcillin for five MRSA strains and experienced host MRSA (MRSAex) transformants. Symbols: •, wild-type MRSA with SCCmec present plus cloning vector pAW8 only; ○, MRSAex with SCCmec excised plus cloning vector only; ▵, MRSAex transformed with pYK20, carrying unregulated mecA; ×, MRSAex transformed with pYK644, carrying the intact mecI-mecR1-mecA complex. Shown on the y axis is the number of cells (per milliliter) growing on nafcillin-containing agar.
