Figure 3From: Enhanced synthesis of 5-hydroxy-l-tryptophan through tetrahydropterin regeneration Scheme of 5-HTP synthesis through cofactor regeneration. PAH, l-phenylalanine 4-hydroxylase; PCD, pterin-4α-carbinolamine dehydratase; DPR, dihydropteridine reductase; GDH, glucose dehydrogenase.Back to article page