According to a recent clinical practice guideline on diagnosis and monitoring of celiac disease by the American Gastroenterological Association, serology testing such as that of tissue transglutaminase IgA, deaminated gliadin IgA, deaminated gliadin IgG, and endomysial IgA antibodies (Abs) is an essential component of the detection and diagnosis of celiac disease.4 The gene discussed is TGM2; the disease is celiac disease.