Biochemistry General 46748d2a Histidine to histamine is ? A Carboxylation B Decarboxylation C Oxidation D Reduction High-Yield Explanation Ans. is 'b' i.e., DecarboxylationHistamine is synthesized from histidine by decarboxylation catalyzed by histidine decarboxylase.Reaction requires pyridoxal phosphate (PLP) as coenzyme.