1. Department of Plant Biology and Biotechnology; University of Copenhagen; Thorvaldsensvej 40; Copenhagen; Frederiksberg C; 1871; Denmark
2. Division of Life Science; Graduate School of Science and Engineering; Saitama University; 255 Shimo-okubo; Sakura-ku; Saitama; 338-8570; Japan
3. Food Biotechnology Division; National Food Research Institute; 2-1-12 Kannondai; Tsukuba; Ibaraki; 305-8642; Japan
4. Department of Biochemistry; Cambridge University; Cambridge; CB2 1QW; UK