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Dissociation of GAPN from a regulatory protein. Gel filtration chromatography of GAPN partially purified from wheat endosperm was performed in the absence (white symbols) or in the presence (black symbols) of 5 mm MgCl2. A280 (circles) and GAPN activity (assayed in the presence of 1 mm EDTA to assure similar conditions for samples derived from chromatography with or without divalent cation; bars) were determined in the different fractions.
