Serological identification of Ia antigens: report of a British region Ia workshop. by Bodmer, J, Pickbourne, P, Bodmer, W, Batchelor, R, Dewar, P, Dick, H, Entwistle, C, Festenstein, H, Gelsthorpe, K, Joysey, V, Mackintosh, P, Lawler, S, Morris, P, Pegrum, G, Harris, R, Taylor, M