Reaction catalyzed by 6,7-dihydropteridine reductase (1.5.1.34)
+
NAD(P)+
=
+
NAD(P)H
+
a 5,6,7,8-tetrahydropteridine
+
NAD(P)+
=
a 6,7-dihydropteridine
+
NAD(P)H
+
H+
