The baby is unable to make an enzyme, phenylalanine hydroxylase, which converts phenylalanine hydroxylase, which converts phenylalanine to tyrosine.
Classical PKU is caused by a deficiency of the liver enzyme phenylalanine hydroxylase, which converts the amino acid phenylalanine to tyrosine.
tryptophan hydroxylase.
tyrosine is converted into DOPA by the enzyme tyrosine hydroxylase.
Tyrosine is converted into DOPA by the enzyme tyrosine is converted into DOPA by the enzyme tyrosine hydroxylase.