1. From the Department of Biochemistry (E.M.E., M.A.S., G.B., J.O.O., B.O.), Institute of Medical Biology, University of Tromsø, Norway; the Department of Immunology and Transfusion Medicine (F.X.E.G.), University Hospital of Northern Norway, Tromsø; and the Department of Biochemistry (B.P.-S., K.G.M.), University of Vermont, Burlington.