TGM2 and cranioectodermal dysplasia: To investigate whether we could identify plasma cell populations mirroring the TG2‐ and TG3‐specific serum antibodies, we co‐stained duodenal biopsy single‐cell suspensions of CeD or DH patients with TG2 and TG3 and detected reactive cells by flow cytometry (Figure2A,B; Figure S1, Supporting Information).