PhoP-dependent proteins identified in our proteomic analysis in S. Typhimurium and not in S. Typhi*.

*These proteins were either not detected in our proteomic analysis of S. Typhi; or if detected, significant differential expression was not observed between PhoP-inducing and non-inducing condition, or if present, this regulation was not found to be PhoP-dependent.**Repressed.��Unique to genome of S. Typhimurium.?Presence of an atypical PhoP box defined as a dyad of (T/G)GTTTA separated by 5 nucleotides in the promoter region, allowing four substitutions as long as the following positions were conserved: a thymine in the first dyad half (at position 3) and two conserved thymines and one conserved adenine in the second dyad half at positions 3, 4, and 6, respectively, within 200�C300 nucleotides of transcriptional start site (see text).