GALNT3 and hypotrichosis 1: The mechanism by which GALNT3 affects BMD without disturbing phosphate homeostasis requires further investigation to avoid precipitating features of FTC or HHS, particularly because there did not appear to be any obvious clustering or segregation of HBM‐associated GALNT3 variants compared to FTC/HHS‐associated GALNT3 variants within the structure of the protein.