pna:Pnap_3020 K00453 tryptophan 2,3-dioxygenase [EC:1.13.11.11] | (GenBank) Tryptophan 2,3-dioxygenase holoenzyme / Tryptophan 2,3-dioxygenase apoenzyme pna:Pnap_3019 K01556 kynureninase [EC:3.7.1.3] | (GenBank) Kynureninase