1. Institute of Biology, University of Neuchâtel, CH–2009 Neuchâtel, Switzerland (M.E., T.C.J.T.); Department of Biological Chemistry, Rothamsted Research, Herts AL5 2JQ, United Kingdom (J.T.); and Department of Biochemistry, Max Planck Institute for Chemical Ecology, D–07745 Jena, Germany (J.D.)