monooxygenase activity oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, reduced flavin or flavoprotein as one donor, and incorporation of one atom of oxygen https://github.com/geneontology/go-ontology/issues/28295 xenobiotic monooxygenase activity aryl-4-monooxygenase activity RHEA:75847 RHEA:76419 MetaCyc:UNSPECIFIC-MONOOXYGENASE-RXN microsomal p450 activity flavoprotein-linked monooxygenase activity Reactome:R-HSA-194678 GO:0008402 GO:0016712 microsomal P-450 GO:0050381 mah molecular_function RHEA:68160 substrate,reduced-flavoprotein:oxygen oxidoreductase (RH-hydroxylating or -epoxidizing) RHEA:51984 flavoprotein monooxygenase activity Catalysis of an oxidation-reduction (redox) reaction in which hydrogen or electrons are transferred from reduced flavin or flavoprotein and one other donor, and one atom of oxygen is incorporated into one donor. Reactome:R-HSA-211966 cytochrome P450 CYP19 EC:1.14.14.1 RHEA:17149 aryl hydrocarbon hydroxylase activity microsomal monooxygenase activity EC:1.14.14.- unspecific monooxygenase activity cytochrome p450 activity RHEA:75863