Affiliation: | (1) Department of Biochemistry, Divisions of Structural Biology, University of Oxford, South Parks Road, Oxford, OX1 3QU, U.K;(2) Present address: Amersham Biosciences, Protein Separations R&D, Bjöorkgatan 30, SE-751 84 Uppsala, Sweden;(3) Department of Molecular and Cellular Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, U.K;(4) MRC Human Immunology Unit, The Weatherall Institute of Molecular Medicine, Headington, Oxford, OX3 9DS, U.K |