Nucleotide sequences were aligned using a CLC sequence viewer. The transcription start site (+1) and promoter regions (-35 and -10) are indicated. Binding sites for ToxR, LeuO, and H-NS are also indicated. Strains from which these leuO sequences originated and the associated NCBI accession numbers are as follows: V. vulnificus MO6-24/O (VVM06_02645), V. cholerae El Tor N16961 (VC2485), V. parahaemolyticus RIMD 2210633 (VP0350), V. harveyi ATCC 43516 (AL538_RS12030), V. navarrensisATCC 51183 (EA26_RS02630), V. cidicii 2756-81 (AUQ44_RS10800), V. alginolyticus K10K4 (K10K4_RS01815), V. diabolicus FDAARGOS_105 (AL537_06395), V. rotiferianus B64D1 (BSZ04_RS21800).