Affiliation: | (1) Department of Botany, University of British Columbia, 6270 University Boulerard, V6T 1Z4 Vancouver, B.C., Canada;(2) Biotechnology Laboratory, University of British Columbia, V6T 1Z3 Vancouver, B.C., Canada;(3) Present address: Department of Biochemistry and Molecular Biology, University of British Columbia, V6T 1Z3 Vancouver, B.C., Canada |