Sulfate reduction pathway of D. kuznetsovii and P. thermopropionicum. Depicted in green are genes that code for sulfate reduction enzymes that are present in the genome. Dashed arrows indicate the presence of a subunit encoding gene, but not the presence of all genes required for the enzyme. Dashed dotted arrows are used when no genes were found for the reaction. Abbreviations: APS, adenylylsulfate; DP, diphosphate; PAPS, 3′-Phosphoadenylyl-sulfate (PAPS); redA, reduced acceptor; oxA, oxidized acceptor.