GALNT3 and hypotrichosis 1: Mice homozygous for a LoF Galnt3 mutation (Trp589Arg), a model for FTC and HHS, have higher areal BMD compared to wild‐type mice, while heterozygous mice had intermediate BMD.(16) Mice homozygous for the mutation also had high cortical bone volume and trabecular number on micro–computed tomography (CT).(36)