Which non-essential amino acid is synthesised by the hydroxylation of phenylalanine in a reaction catalysed by phenylalanine hydroxylase?

Tyrosine is a non-essential amino acid synthesized directly inside the human body by adding a hydroxyl group to the aromatic ring of the essential amino acid phenylalanine. This metabolic reaction is catalyzed by the enzyme phenylalanine hydroxylase. A deficiency of this functional enzyme results in a metabolic condition known as Phenylketonuria (PKU).