Central metabolism and solute transport in the deep-sea vent ε-Proteobacteria. Pathways for which no predictable enzymes were found in strains SB155-2 and NBC37-1 genomes are shown in blue and red arrows, respectively. Numbers of transport machineries are shown for both strains. The KEGG database was used for the reconstruction of metabolic pathways. Cyt, cytochrome; H2ase, hydrogenase; Sqr, sulfide-quinone oxidoreductases; Nap, periplasmic nitrate reductase; cdNir, cytochrome cd1 nitrite reductase; Nor, nitric oxide reductase; Nos, nitrous oxide reductase; Mdh, malate dehydrogenase; Sdh, succinate dehydrogenase.