sentences:  Fumarylacetoacetate hydrolase (FAH) is a protein homodimer which cleaves fumarylacetoacetate at its carbon-carbon bond during a hydrolysis reaction.As a critical enzyme in phenylalanine and tyrosine metabolism,  4-Fumarylacetoacetate hydrolase catalyzes the final step in the catabolism of 4-fumarylacetoacetate and water into acetoacetate, fumarate, and H+ respectively.These hydrolytic reactions are essential during aromatic amino acid human metabolism.