Figure 2 illustrates the representative MS spectra for serum, depleted sera without albumin and IgG (DS), and IgG fraction samples of one ADHD patient, with marked signals of N-glycans present in all spectra of individual groups of samples. In Table 3 are shown the probable structures of N-glycans present in all spectra of individual groups of samples. Here, ALB is linked to attention deficit-hyperactivity disorder.