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Northern blots of RNA (10 μg) extracted from S. aureus RN6390 (lane 1), SP6391 (sspA::ermAB [lane 2]), SP6912 (agr sspA::ermAB [lane 3]), and RN6911 (agr [lane 4]). The probes used correspond to sspA (A), sspB (B), sspC (C), the 5′ end of sspA prior to the ermAB insertion point (D), or RNAIII (E).
