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Indole is generated by reductive deamination from tryptophan via the intermediate molecule indolepyruvic acid. Tryptophanase catalyzes the deamination reaction, during which the amine (-NH₂) group of the tryptophan molecule is removed. Final products of the reaction are indole, pyruvic acid, ammonium (NH₄) and energy. Pyridoxal phosphate is required as a coenzyme.