1.7.7 (with an iron–sulfur protein as acceptor) :Category:EC 1.7.99 (with other acceptors) Nitrite reductase Nitrate reductase :Category:EC 1.8 (act on a sulfur group of donors) :Category:EC 1.8.1 (with NAD+ or NADP+ as acceptor) Glutathione reductase Thioredoxin reductase :Category:EC 1.8.2 (with a cytochrome as acceptor) :Category:EC 1.8.3 (with oxygen as acceptor) Sulfite oxidase :Category:EC 1.8.4 (with a disulfide as acceptor) :Category:EC 1.8.5 (with a quinone or similar compound as acceptor) Category:EC 1.8.6 deleted, included in EC 2.5.1.18 :Category:EC 1.8.7 (with an iron–sulfur protein as acceptor) :Category:EC 1.8.98 (with other, known, acceptors) :Category:EC 1.8.99 (with other acceptors) :Category:EC 1.9 (act on a heme group of donors) :Category:EC 1.9.3 (with oxygen as acceptor) Cytochrome c oxidase :Category:EC 1.9.6 (with a nitrogenous as acceptor) Category:EC 1.9.99 transferred, now EC 1.9.98.1 :Category:EC 1.10 (act on diphenols and related substances as donors) :Category:EC 1.10.1(with NAD+ or NADP+ as acceptor) :Category:EC 1.10.2 (with a cytochrome as acceptor) Coenzyme Q - cytochrome c reductase :Category:EC 1.10.3 (with oxygen as acceptor) Catechol oxidase Laccase :Category:EC 1.10.99 (with other acceptors) :Category:EC 1.11 (act on peroxide as an acceptor -- peroxidases) :Category:EC 1.11.1 (peroxidases) Cytochrome c peroxidase Catalase Myeloperoxidase Thyroid peroxidase Glutathione peroxidase :Category:EC 1.12 (act on hydrogen as a donor) :Category:EC 1.12.1 (with NAD+ or NADP+ as acceptor) :Category:EC 1.12.2 (with a cytochrome as acceptor) :Category:EC 1.12.5 (with a quinone or similar compound as acceptor) :Category:EC 1.12.7 (with an iron–sulfur protein as acceptor) :Category:EC 1.12.98 (with other known acceptors) :Category:EC 1.12.99 (with other acceptors) :Category:EC 1.13 (act on single donors with incorporation of molecular oxygen) :Category:EC 1.13.11 (With incorporation of two atoms of oxygen) 4-hydroxyphenylpyruvate dioxygenase () :Category:EC 1.13.12 (With incorporation of one atom of oxygen (internal monooxygenases or internal mixed function oxidases)) Renilla-luciferin 2-monooxygenase Cypridina-luciferin 2-monooxygenase Firefly luciferase Watasenia-luciferin 2-monooxygenase Oplophorus-luciferin 2-monooxygenase :Category:EC 1.14 (act on paired donors with incorporation of molecular oxygen) Cytochrome P450 oxidase :Category:Cytochrome P450 Aromatase CYP2D6 CYP2E1 CYP3A4 Cytochrome P450 oxidase :Category:EC 1.14.12 Nitric oxide dioxygenase :Category:EC 1.14.13 Nitric oxide synthase :Category:EC 1.14.14 Aromatase CYP2D6 CYP2E1 CYP3A4 :Category:EC 1.14.16 Phenylalanine hydroxylase :Category:EC 1.14.18 Tyrosinase :Category:EC 1.15 (act on superoxide radicals as acceptors) :Category:EC 1.15.1 Superoxide dismutase :Category:EC 1.16 (oxidize metal ions) :Category:EC 1.16.3 Ceruloplasmin :Category:EC 1.17 (act on CH or CH2 groups) :Category:EC 1.17.1 Leucoanthocyanidin reductase Xanthine dehydrogenase Nicotinate dehydrogenase 4-hydroxy-tetrahydrodipicolinate reductase :Category:EC 1.17.2 Nicotinate dehydrogenase (cytochrome) :Category:EC 1.17.3 Xanthine oxidase :Category:EC 1.17.4 Ribonucleotide reductase Ribonucleoside-triphosphate reductase Vitamin K epoxide reductase Vitamin-K-epoxide reductase (warfarin-sensitive) Vitamin-K-epoxide