. "Active under conditions of low light." . "Along with EC 1.10.99.3, this enzyme forms part of the xanthophyll (or violaxanthin) cycle, which is involved in protecting the plant against damage by excess light." . "It will also epoxidize lutein in some higher-plant species." . . . "Zeaxanthin epoxidase" . "Zea-epoxidase" . "Zeaxanthin + 2 NAD(P)H + 2 O(2) = violaxanthin + 2 NAD(P)(+) + 2 H(2)O." . "FAD" .