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MALDI-TOF profile of immunopurified transferrin, carrying 1 (m/z 77.3 kDa) or 2 (m/z 79.6 kDa) N-glycan chains. Dotted line: control, continuous line: case 1. The gray boxes represent the glycosylation consensus sequences of the transferrin protein. Right: SDS-PAGE of serum transferrin: C = control, C1 = case 1, C1.M. = mother of case 1
