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Effect of a loss-of-function mutation in sicA on the intracellular and extracellular levels of SipB and SipC. Whole-cell lysate and culture supernatant proteins from wild-type S. enterica serovar Typhimurium, its isogenic sicA mutant strain SB221, or the same mutant carrying a sicA-complementing plasmid pSB814 (psicA) were separated by SDS-PAGE, transferred to a nitrocellulose membrane, and probed with a mixture of SipB and SipC monoclonal antibodies.
