3.4.23.18 glycoprotein 1-2% 3.4.23.18 glycoprotein carbohydrate content: less than 0.3% (enzyme form A2), about 50% (enzyme form A1) 3.4.23.18 glycoprotein 80.5% (enzyme form M1), 52.5% (enzyme form M2) 3.4.23.18 proteolytic modification the secreted enzyme has a pro-sequence, and is processed pH-dependently at below pH 4.6 to the mature enzyme 3.4.23.18 proteolytic modification the enzyme is synthesized as pro-enzyme