FIG 2 .

Repression of the acs-dependent acetate switch by chitin sugars. (A) Detection of acetate in the culture supernatant after growth in LBS under anoxic and oxic growth conditions, either with or without 20 mM GlcNAc (n = 2; results shown are representative of two independent experiments). Activity of the acs promoter region during growth in a tryptone-based medium, either with or without 20 mM GlcNAc added, of either PTS mutants (n = 2; results are representative of two independent experiments) (B) or in the presence or absence of 20 mM GlcNAc and/or 100 nM C8-HSL (n = 3). a and b indicate groups of statistically similar means, assessed as described for Fig. 1.