Sws_00244 K01712 hutU, UROC1 R029144-Imidazolone-5-propanoate <=> Urocanate + H2O
4,5-dihydro-4-oxo-5-imidazolepropanoate hydro-lyase Sws_00245 K01745 hutH, HAL R01168L-Histidine <=> Urocanate + Ammonia
L-histidine ammonia-lyase (urocanate-forming)