Vedholdende eller tilbagevendende dysfunktion af fenylalanin- tyrosin- dihydroxy- L- phenylalanin (DOPA) metabolismen kan medføre utilstrækkelig protein - og neurotransmittersyntese.
Sustained or recurrent dysfunction in the phenylalanine-tyrosine-dihydroxy-L-phenylalanine (DOPA) metabolic pathway can result in deficient body protein and neurotransmitter synthesis.