1. Laboratory of Phytopathology, Wageningen University, 6709 PD, Wageningen, The Netherlands (R.A.L.v.d.H., M.H.A.J.J.); Sainsbury Laboratory, John Innes Centre, NR4–7UH, Norwich, United Kingdom (R.A.L.v.d.H., S.C.P.); Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, 2300 RA, Leiden, The Netherlands (M.A.L.); and Department of Pathology, Stanford University Medical School, St