Histidine Decarboxylase

**Definition:** An enzyme that catalyzes the decarboxylation of histidine to histamine and carbon dioxide. It requires pyridoxal phosphate in animal tissues, but not in microorganisms. EC 4.1.1.22.

**Tree numbers:** - D08.811.520.224.125.300

**Synonyms:** - Histidine Carboxy-Lyase