HLA-G and Schwartz-Jampel syndrome: In comparison with healthy subjects and patients with non-SjS salivary gland disease, there were increased levels of soluble immune-related proteins, lactoferrin, β2-microglobulin, IgA, and autoantibodies in glandular and whole-mouth saliva from patients with SjS (Tabak et al. 1978; Carpenter et al. 2000; Katsiougiannis and Wong 2016).