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Expression of virulence determinants of the pknB mutant. (A) Northern blot analysis of sarA, RNAIII, RNAII, hla, and spa gene transcription in USA300, the pknB mutant, and the complemented mutant. (B) Relative hemolytic titers of the pknB mutant with sheep red blood cells in comparison to those of the parent and complemented strains.
