Cells were plated for 4 days on LP (minimal media plates) withE.coli B/r and for 11 days on 1/2xHL5 plates onE.coli B/r (rich broth plates). The areas of between 30to 70 plaques per strain were determined on a minimum of 5 differentplates per strain. Experiments were repeated at least 3 times withsimilar results on different days. Absolute plaque size differs withdifferent batches of plates but the relative plaque size differencesbetween strains are highly reproducible. Errors are standard errorof the mean. * indicates difference is significant from Wt (p value< 0.001). There was no significant difference in plaque sizebetween KO and OE (p value = 0.26) on rich broth plates butsignificant differences between KO and OE on minimal media plates (pvalue < 0.001).