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Fractionation of mixed membranes of Arabidopsis on a Suc gradient in the presence of 1 mm EDTA. Each fraction was assayed for: A, density and glucan synthase II (a plasma membrane marker); B, activities of antimycin A-insensitive NADH cytochrome C reductase (an ER marker) and IDPase (a Golgi apparatus marker); C, [AO]7:GalT activity; and D, d[AO]51:GalT activity.
