Genomic organization of the genes in the metJBLF cluster. Species are: Ec, Escherichia coli K12 MG1655 (Ent); Hi, Haemophilus influenzae Rd KW20 (Pas); Vc, Vibrio cholerae N16961 (Vib); Ah, Aeromonas hydrophila (Aer); So, Shewanella oneidensis (Alt); Cp, Colwellia psychrerythraea (Alt); and Kk, Kangiella koreensis (Alt). Genes are color-coded and spaces have been introduced between adjacent genes in order to align homologs vertically. In cases where a large number of other genes intervene between those of interest, a separation symbol is used://. Sites of metboxes are indicated by a circled X. Genes which were tested for repression in this paper are displayed with their repression ratio above the gene arrow.