L Hanneken

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Dopamine is an important mediator of the neuronal adaptation mechanism of the retina. Tetrahydrobiopterin (BH4) is cofactor of the rate-limiting enzymatic tyrosine-hydroxylase step in the biosynthetic pathway of dopamine. This enzymatic step causes an oxidation of BH4 to dihydrobiopterin (BH2), which is reduced again to BH4 by action of(More)
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