SLC39A13 and spondylodysplastic Ehlers-Danlos syndrome: Two of these LKs, GalT-I- and GalT-II-deficiency, fit with the EDS spectrum and are recognized in the 2017 EDS nosology as spondylodysplastic EDS (spEDS) that also includes patients with mutations in SLC39A13 encoding the ZIP13 protein involved in the influx of zinc into the cytosol [1,14].