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Effect of a loss-of-function mutation in sicP on the intracellular and extracellular levels of SptP. Whole-cell lysate and culture supernatant proteins from wild-type S. typhimurium, its isogenic sicP mutant strain SB747, or the same mutant carrying the sicP-complementing plasmid pSB679 (psicP) were separated by SDS-PAGE, transferred to a nitrocellulose membrane, and probed with an anti-SptP monoclonal antibody. The arrow indicates the position of SptP.
