. "\"Catalysis of the reaction: L-phenylalanine + tetrahydrobiopterin + O2 = L-tyrosine + 4-alpha-hydroxytetrahydrobiopterin.\" [EC:1.14.16.1]" . . "phenylalanine 4-monooxygenase activity" . "L-phenylalanine,tetrahydrobiopterin:oxygen oxidoreductase (4-hydroxylating)" . "PAH activity" . "phenylalaninase activity" . "phenylalanine 4-hydroxylase activity" . "phenylalanine hydroxylase activity" . "EC:1.14.16.1" . "MetaCyc:PHENYLALANINE-4-MONOOXYGENASE-RXN" . "Reactome:REACT_104236 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Rattus norvegicus\"" . "Reactome:REACT_107202 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Gallus gallus\"" . "Reactome:REACT_2 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Homo sapiens\"" . "Reactome:REACT_32661 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Canis familiaris\"" . "Reactome:REACT_33652 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Drosophila melanogaster\"" . "Reactome:REACT_78419 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Caenorhabditis elegans\"" . "Reactome:REACT_82050 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Mus musculus\"" . "Reactome:REACT_89849 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Bos taurus\"" . "Reactome:REACT_90357 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Dictyostelium discoideum\"" . "Reactome:REACT_96148 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Sus scrofa\"" . "Reactome:REACT_96746 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Taeniopygia guttata\"" . "Reactome:REACT_99314 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Danio rerio\"" . "Reactome:REACT_99414 \"phenylalanine + tetrahydrobiopterin + O2 => tyrosine + 4a-hydroxytetrahydrobiopterin + H2O, Xenopus tropicalis\"" . "RHEA:20276" . .