Institution: | (1) Department of Plant Sciences and Cambridge Centre for Molecular Recognition, University of Cambridge, Downing Street, Cambridge, CB2 3EA, UK ( author for correspondence);(2) Present address: Department of Plant Biology, University of California, Berkeley, CA 94720, USA;(3) Present address: Cambridge Antibody Technology, The Science Park, Melbourn, Royston, SG8 6JJ, UK |