1. Plant Chemetics Laboratory, Chemical Genomics Centre of the Max Planck Society (K.H.R., F.K., T.C.P., R.A.L.V.d.H.), Mass Spectrometry Group (T.C.), and Max Planck Genome Center (K.S.), Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany; Department of Pathology, Stanford University School of Medicine, Stanford, California 94305 (M.V., M.B.); Center of Physiological Proteomic