For the samples analyzed here, IgA concentration was not measuredbut it has previously been reported that IgA concentrations do notdiffer between IBD and HC.48 The approachused for the sample preparation included an excess of immunoaffinitybeads for capturing, and total area normalization of the extractedglycans during data analysis enabled us to look at changes in theglycosylation profile of IgA without correction for IgA concentration. The gene discussed is CD79A; the disease is inflammatory bowel disease.