btz:BTL_2992 K00453 tryptophan 2,3-dioxygenase [EC:1.13.11.11] | (GenBank) kynA; tryptophan 2,3-dioxygenase btz:BTL_2991 K01556 kynureninase [EC:3.7.1.3] | (GenBank) kynU; kynureninase btz:BTL_2990 K07130 arylformamidase [EC:3.5.1.9] | (GenBank) kynB; arylformamidase