Clustering in native MS with 500 µM HBGA B type 1 tetrasaccharide (HBGA B), all spectra contain P-dimer and different reference proteins. From top to bottom: cytochrome c (cyt c), green fluorescent protein (GFP), carbonic anhydrase (CA), alcohol dehydrogenase (ADH). It is evident that the clustering under otherwise identical conditions is vastly different for the four proteins. Figure reproduced under creative commons attributions license from [43].