Cluster of genes absent from Y. ruckeri ATCC29473 type strain and present in the strains Y. ruckeri 150, CSF007-82, Big Creek and SC09. The region contains genes encoding for an enterobactin-like siderophore (blue), nine genes involved in the uptake and metabolism of citrate (yellow), a group of three genes related to hexose phosphate uptake (pink), three genes involved in iron transport (red) and a Crp-Fnr family transcriptional regulator (green). (1) Citrate succinate antiporter, (2) 2-(5′-triphosphoribosyl)-3′-dephosphocoenzyme-A synthase, (3) Apo-citrate lyase phosphoribosyldephospho-CoA transferase, (4) Citrate lyase alpha chain, (5) Citrate lyase beta chain, (6) Citrate lyase gamma chain acyl carrier protein, (7) [Citrate[pro-3S]-lyase] ligase, (8) Sensor kinase, (9) Transcriptional regulatory protein, (10) Transcriptional regulatory protein, (11) Sensor histidine protein kinase glucose-6-phosphate specific, (12) Hexose phosphate uptake regulatory protein, (13) Ferric iron ABC transporter iron-binding protein, (14) Ferric iron ABC transporter permease protein, (15) Ferric iron ABC transporter binding subunit (Figure taken from Cascales et al., 2017).