Table 2. Media used for growth and motility experiments.

Medium	Composition
TB	1% bacto tryptone
	0.5% NaCl
	pH 7.0
MBc	Difco Marine Broth 2216
	Centrifuged to remove precipitate
MotM	10 mM KPO4
	0.1 mM EDTA
	1 μM L-methionine
	10 mM lactic acid
	0.067 mM NaCl
	pH 7.0
BsMM	50 mM KPO4
	1.2 mM MgCl2
	0.14 mM CaCl2
	1 mM (NH4)2SO4
	0.01 mM MnCl2
	20 mM sorbitol
	0.02% Bacto tryptone
	50 μg ml−1 L-histidine
	50 μg ml−1 L-methionine
	50 μg ml−1 L-tryptophan
	pH 7.0
TMN	50 mM Tris-HCl
	5 mM MgCl2
	5 mM glucose
	300 mM NaCl
	pH 7.5

BsMM, B. subtilis minimal medium; MBc, Marine Broth 2216 (Difco), clarified by centrifugation at 4,500g for 10 min; MotM, E. coli motility medium; TB, tryptone broth; TMN, TMN motility medium.