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Robert Liddington1, Christin Frederick2, Jane Clarke3, Sophie Jackson
1Program on Cell Adhesion, The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037 USA
2Laboratory of X-ray Crystallography, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA
3Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK