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Northern blot analysis of sarA, RNAIII, and ssp transcripts in protease-negative (KS7, KS30, and KS33) and protease-positive (KS26 and KS36) clinical isolates of S. aureus at different time points during growth. 16S rRNA was used as an internal control of the amount of total RNA loaded. The same filter was hybridized with each of the specific probes.
