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(a) Schematic diagram of the proposed synthesis pathway for proline in Sulfurimonas denitrificans (black dashed arrows; genes encoding for all involved enzymes are present in genome) and (b) the known pathway for succinic acid production from ornithine in heterotrophic bacteria (solid arrows) and the hypothetical pathway in S. denitrificans (gray dashed arrows; genes could not be confirmed in genome)
