Reaction catalyzed by phenylalanine 4-monooxygenase (1.14.16.1)
+
+
=
+
L-phenylalanine
+
(6R)-L-erythro-5,6,7,8-tetrahydrobiopterin
+
O2
=
L-tyrosine
+
4a-hydroxy-(6R)-L-erythro-5,6,7,8-tetrahydrobiopterin
