CsrACJrescues the morphological phenotypes of the E. coli csrA mutant. (A) MG1655[pBAD], (B) TRMG1655[pBAD], (C) TRMG1655[pBADcsrAEC], and (D) TRMG1655[pBADcsrACJ] were grown overnight at 37°C in LB media supplemented with 0.002% L-arabinose and imaged by scanning electron microscopy. (E) Measured lengths of cells from SEM micrographs graphed for comparison. Presence (+) or absence (−) of CsrAEC or CsrACJ in each strain is shown beneath the panels. ANOVA was performed to determine statistical significance of TRMG1655 expressing recombinant CsrAEC or CsrACJ versus TRMG1655[pBAD] (* p<0.001).