| histidine decarboxylase activity |
| histamine biosynthetic process |
| histamine metabolic process |
| imidazole-containing compound catabolic process |
| histidine catabolic process |
| histidine metabolic process |
| imidazole-containing compound metabolic process |
| catecholamine biosynthetic process |
| catechol-containing compound biosynthetic process |
| cellular biogenic amine biosynthetic process |
| amine biosynthetic process |
| aromatic amino acid family catabolic process |
| phenol-containing compound biosynthetic process |
| aromatic amino acid family metabolic process |
| neurotransmitter biosynthetic process |
| catechol-containing compound metabolic process |
| catecholamine metabolic process |
| pyridoxal phosphate binding |
| cellular biogenic amine metabolic process |
| cellular amine metabolic process |
| amine metabolic process |
| phenol-containing compound metabolic process |
| neurotransmitter metabolic process |
| alpha-amino acid catabolic process |
| cellular amino acid catabolic process |
| organic hydroxy compound biosynthetic process |
| ammonium ion metabolic process |
| alpha-amino acid metabolic process |
| carboxylic acid catabolic process |
| organic acid catabolic process |
| cellular amino acid metabolic process |
| regulation of neurotransmitter levels |
| heterocycle catabolic process |
| cellular nitrogen compound catabolic process |
| small molecule catabolic process |
| aromatic compound catabolic process |
| organic hydroxy compound metabolic process |
| organic cyclic compound catabolic process |
| carboxylic acid metabolic process |
| oxoacid metabolic process |
| organic acid metabolic process |
| organonitrogen compound catabolic process |
| heterocycle biosynthetic process |
| aromatic compound biosynthetic process |
| organic cyclic compound biosynthetic process |
| organonitrogen compound biosynthetic process |
| cellular nitrogen compound biosynthetic process |
| small molecule metabolic process |
| organic substance catabolic process |
| cellular catabolic process |