[en] Complete assignments of all anomeric resonances in the proton and carbon spectra of the N-linked oligosaccharide units of fetuin were made using one- and two-dimensional NMR spectroscopy. The authors are able to confirm the presence of microheterogeneity in the N-acetylneuraminic acid linkages to the galactose residues and the presence of a unique triantennary structure which carries a side chain: NeuAcα(1-3)Galβ(1-3)GlcNacβ(1-4)-. Anomeric carbon chemical shifts changes resulting from long-range conformational effects were observed. (Auth.)