KEGG Orthology (KO) [BR:rno00001] 09100 Metabolism 09105 Amino acid metabolism 00340 Histidine metabolism [PATH:rno00340] 24443 Hdc; histidine decarboxylase K01590 hdc; histidine decarboxylase [EC:4.1.1.22] Enzymes [BR:rno01000] 4. Lyases 4.1 Carbon-carbon lyases 4.1.1 Carboxy-lyases 4.1.1.22 histidine decarboxylase 24443 Hdc; histidine decarboxylase K01590 hdc; histidine decarboxylase [EC:4.1.1.22]