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PhoP P C PhoP PhoP P C P C glnII glnA amtB Figure S1. Analysis by EMSA of competition by excess unlabelled probe of binding of PhoP to the glnA, glnII and amtB promoters. P: probe without protein; PhoP: probe with GST-PhoPDBD protein (0.5 µM ); C: Control with GST-PhoPDBD protein (0.5 µM) and an excess of unlabeled probe. Note the competition with the labeled probe in the formation of the shifted band.