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Schematic representation of the structural domains of enzymes involved in steps 2 (GARS, PurD), 3 (GART, PurN), 3'(PurT), 5 (AIRS, PurM), 6 (CAIRS, PurE), 6’ (PurK), 7 (SAICARS, PurC), 9 (AICART, PurH) and 10 (IMPC, PurH) in vertebrates and bacteria taking as representatives human and E. coli enzymes.
