Galactose oxidase is an extracellular copper-containing enzyme, secreted by the deuteromycete fungus Dactylium dendroides. It catalyzes the oxidation of a range of primary alcohols, including D-galactose, to the corresponding aldehyde, with reduction of oxygen to hydrogen peroxide.http://www.creative-enzymes.com/product/Native-Dactylium-Dendroides-Galactose-Oxidase_1185.html