Phenylalanine metabolic pathway diet protein phenylalanine hydroxylase(PAh) phenylalanine tvrosine BH4 thyroxin dopa phenylpyruvic acid d I rename phenyllactate phenylacetatePhenylalanine metabolic pathway diet protein phenylalanine hydroxylase(PAH) phenylalanine tyrosine BH4 phenylpyruvic acid phenyllactate phenylacetate thyroxin dopa adrenaline