Abstract
1 Center for Agricultural Molecular Biology, Rutgers University, New Brunswick, New Jersey 08903
2 Department of Applied Chemistry and Microbiology, University of Helsinki, Helsinki, Finland
4 Department of Electron Microscopy, University of Helsinki, Helsinki, Finland
3 Department of Microbiology, New York University of Medical Center, New York, New York 10016
5 DSM-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, D-38124 Braunschweig, Germany