They divided the cohort into three study groups: Group 1 children with only T1DM, Group 2 children with TIDM and positive serology for CD (antigliadin, endomysium, or tissue transglutaminase antibodies) and no small bowel biopsy, and Group 3 children with T1DM and CD diagnosed based on small biopsy changes [27]. The gene discussed is TGM2; the disease is type 1 diabetes mellitus.