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Western blot analysis of His-tagged WbbE in cytoplasmic and inner membrane fractions. Lanes: 1, cytoplasmic fraction from negative control BL21/pET30a(+); 2, cytoplasmic membrane fraction of negative control; 3, cytoplasmic fraction of BL21(pWQ839); 4, inner membrane fraction of BL21(pWQ839). Fusion proteins were detected with anti-His antibody.
