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Phenylalanine hydroxylase breaks down phenylalanine.
Aspartate and Phenylalanine methyl ester. The phenylalanine is then converted into Tyrosine by Phenyalanine Hydroxylase in people who don't have PKU.
phenylketonuria
In humans, the gene that codes for the enzyme phenylalanine hydroxylase is an expmple of a recessive gene
They could not produce tyrosine slowly