TGM2 and cranioectodermal dysplasia: In a recent small study by Sakhuja S. et al., which followed 11 children with PCD who progressed to CeD, the authors demonstrated lower anti-TTG IgA concentrations (2.4 (1.6–5) × ULN) vs. 6.41 (3.4–10.5) × ULN) at the time of the first biopsy in PCD patients compared to patients diagnosed with CeD [14].