Affiliation: | Max Planck Institute for Molecular Plant Physiology, Wissenschaftspark Golm, Am Mühlenberg 1, Potsdam-Golm, D-14 476, Germany,; Bioquant Center, University of Heidelberg, Im Neuenheimer Feld 267, D-69120 Heidelberg, Germany, and; Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73 401, USA |