Institution: | (1) Fakult?t für Biologie, Universit?t Bielefeld, 4800 Bielefeld 1, Federal Republic of Germany;(2) Université Laval, GIV 4G2 Sainte-Foy, Quebec, Canada;(3) Monsanto Company, 63198 St. Louis, Missouri, USA;(4) Institut Pasteur, F-75724 Paris, Cedex 15, France;(5) Present address: Banner, Birch, McKie & Beckett, Thomas Circle, NW, 20005 Washington, DC, USA |