Blood Group, P1pk System, also known as nor polyagglutination syndrome, is related to combined osteogenesis imperfecta and ehlers-danlos syndrome 1 and ehlers-danlos syndrome. An important gene associated with Blood Group, P1pk System is A4GALT (Alpha 1,4-Galactosyltransferase (P1PK Blood Group)), and among its related pathways/superpathways are superpathway of glycosphingolipids biosynthesis and Globo sphingolipid metabolism.