1. Fungal Cell Biology Group, Institute of Cell Biology; University of Edinburgh, Rutherford Building; Edinburgh EH9 3JH United Kingdom
2. Institut für Genetik, Technische Universität Braunschweig; Spielmannstraße 7 38106 Braunschweig Germany
3. Department of Plant and Microbial Biology; University of California; Berkeley CA 94729-3102