Dr. Macica states: “The formation of enthesophytes was our focus, with a major emphasis on characterizing the cellular changes that occur in enthesophyte formation using the murine model of XLH, Hyp mice. We have found that mineralization, while thought to originate from bone, is actually due to both an expansion of fibrocartilage cells that express the FGFR3 receptor and an increase in alkalin...