G. Relative fitness of ΔnlpI, ΔmepS and ΔnlpIΔmepS mutants. Strains were arrayed using a Rotor HDA replicator on Lennox LB agar plates supplemented 10% sucrose, or LB agar plates containing 0 mM or 500 mM NaCl. Plates were incubated for 12 h at 37°C. Each plate contained 384 colonies, 96 from the wildtype, single mutants and double mutants. 