AUTHOR CORRECTION
Volume 192, no. 5, p. 1279–1291, 2010, https://doi.org/10.1128/JB.01285-09. Page 1284, Fig. 2A: There is an erroneous duplication in a panel on the right side: the “RelB2 + RelE2” panel contains the same image as the “RelB3 + RelE3” panel. We no longer have the original images, although the plasmids and strains remain available. The duplication does not affect the conclusions of this work.