B4GALT7 and dentin dysplasia: Homozygous mutations of B4GALT7 (galactosyltransferase I; MIM 604327) have been described in patients with the progeroid form of Ehlers–Danlos syndrome (MIM 130070) characterized by an aged appearance, DD, short stature, craniofacial disproportion, generalized osteopenia, defective wound healing, hypermobile joints, hypotonic muscles, and loose but elastic skin (Okajima et al. 1999).