HSPG2 and connective tissue disorder: Our protein data indicated the disorganization of the core proteins of PGs perlecan, versican, and DCN, which enhance COLL fibril formation [26], and their abnormal organization could contribute to the defective COLLIII fibril assembly in vEDS cells, as well as to the defective fibrillogenesis of other COLLs previously described in skin fibroblasts of different EDS types and in other connective tissue disorders with vascular involvement such as arterial tortuosity syndrome [16,17,19,33,34].