Figure 2. Galactose deficiency of IgG in serum and gingival crevicular fluid of periodontal disease patients and controls. (A) PVL reactivity (OD at 405 nm after 2 hrs of incubation) of serum IgG from patients with periodontal disease (N = 14) and from healthy controls (N = 10). P = 0.0046. (B) IgG glycosylation (PVL index) in serum and gingival crevicular fluid (GCF) from periodontal patients (N = 7).