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Exoproteomes from wild-type (LAC), sarA, and sarA/protease strains of S. aureus have distinct molecular masses. An equal volume of CM from each strain was resolved by one-dimensional SDS-PAGE and visualized by Coomassie staining. Strains were analyzed in biological triplicate. Each gel lane was sliced into 24 equiv sections. Protein in each gel slice was digested in-gel with trypsin and identified by high-resolution mass spectrometry.
