Roc pathway of utilization of arginine-related amino acids and proline. The enzymes in this figure are indicated by the name of the corresponding gene, as follows: UreABC, urease; RocF, arginase; RocD, ornithine aminotransferase; RocA and YcgN, Δ1-pyrroline-5-carboxylate dehydrogenases; RocG, glutamate dehydrogenase; RocB, citrullinase(?); YcgM and YusM, proline oxidases (proline dehydrogenases).