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Transferrin isoelectric focusing profiles before and after neuraminidase incubation. Lane 1 and 1’: control, lane 2 and 2’: PMM2-CDG, lane 3 and 3’: case 1, lane 4 and 4’: mother of case 1, lane 5 and 5’: case 2, lane 6 and 6’: mother of case 2, lane 7 and 7’: patient with a known “D variant” polymorphism. Left and right of the figure are the numbers of sialic acids present on transferrin C variant
