Fig. 4From: Diagnostic and therapeutic recommendations for the treatment of hyperphenylalaninemia in patients 0–4 years of ageDiagrammatic representation of the course of a successful therapy trial with sapropterin in a newborn with BH4-responsive PAH deficiency. BH4: Tetrahydrobiopterin; PAH: Phenylalanine hydroxylase; Phe: Phenylalanine; PKU: PhenylketonuriaBack to article page