TGM2 and celiac disease: Compared with controls, immunoglobulin heavy variable 5–51 (IGHV5-51) (p = 1.05 × 10−14) and tissue transglutaminase (TGM2) (p = 5.29 × 10−10), encoding for TG2, the main autoantigen in celiac disease, were two of the top up-regulated genes in intestinal biopsies from celiac cases.