Formimidoyltransferase cyclodeaminase or formiminotransferase cyclodeaminase (gene symbol FTCD in humans) is a bifunctional enzyme that catalyzes the following reactions:[1] Its name comes from the two activities it catalyzes.

Mutations of the FTCD gene cause glutamate formiminotransferase deficiency.

[1] This lyase article is a stub.

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(See Template:Leucine metabolism in humans – this diagram does not include the pathway for β-leucine synthesis via leucine 2,3-aminomutase)