Table 1.

Heterogeneity of desialylated O-glycans in normal human serum IgA1

Data are derived from high-resolution mass spectrometric analyses. Sites S230, T233, and T236 are the primary sites of galactose deficiency in normal serum IgA1 and variable positional isomers. Modified from [24, 34]. White squares = GalNAc; black circles = galactose.