Ascorbic Acid Camu-camu EC 1.1.1.- EC 1.1.1.48 EC 1.3.- EC 1.3.2.3 GDP-d-mannose 3',5'-epimerase Galactose Dehydrogenases Journal Article Oxidoreductases Acting on CH-CH Group Donors PQ6CK8PD0R Plant Proteins Research Support, Non-U.S. Gov't Smirnoff–Wheeler pathway enzyme structure galactonolactone dehydrogenase galactose dehydrogenase l-ascorbic acid l-galactono-1,4-lactone dehydrogenase Myrciaria dubia l-galactose dehydrogenase vitamin C