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Cells of a B. subtilis sigW knockout display a growth defect upon depletion of FtsH protein. Growth of B. subtilis strains 1012 (wild type) (circles), MSW01 (sigW+ pX2-ftsH) (triangles), 1012 sigW::neo (sigW knockout; ftsH+) (diamonds), and SZ08 (sigW knockout; pX2-ftsH) (squares) was monitored in the presence (solid symbols) and absence (open symbols) of xylose added to the growth medium. Cultures were inoculated from early-stationary-phase cultures without xylose to an OD578 of 0.08.
