MALDI-TOF/TOF MS fragmentation of N-linked glycans at 1595.7 (A), 1851.8 (B), 2245.8 (C) and 2982.2 (D) were compared between human, domestic pigs, GGTA1 knockout pigs, and GGTA1/CMAH knockout pigs as the percent of relative intensity (n=3). Statistically significant differences were indicated with an asterisk (P<0.05, paired one tailed T-test). Complete structures as determined from MALDI-TOF/TOF analysis are shown to the left of each panel.