Hyperphenylalaninemia and 7-Pterin Excretion Associated with Mutations in 4a-Hydroxy-tetrahydrobiopterin Dehydratase/DCoH: Analysis of Enzyme Activity in Intestinal Biopsies von Ayling, J.E., Bailey, S.W., Boerth, S.R., Giugliani, R., Braegger, C.P., Thöny, B., Blau, N.

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