Figure 2: StoS and SreKRS positively regulate EPS synthesis and swarming.

(A) Gene complementation analysis of stoS and sreK. The target genes were cloned into pHM1 and expressed in targeted mutants under the control of their native promoters and terminators. Mutants rescued with the deleted gene were applied to assay EPS production and swarming. (B) Other genes in the stoS and sreKRS operons were knocked out in-frame, and EPS production and swarming tests were performed on the mutants.