Peter Biely Tadashi Hirano Institute of Chemistry The Jikei University School of Medicine Slovak Academy of Sciences 3-25-8 Nishi-Shinbashi, Minatoku Dúbravská cesta 9 Tokyo 105, Japan 842 38 Bratislava, Czechoslovakia B.J.M. Zonneveld G.G. Stewart Dept. of Cell Biology and Genetics Labatt Breweries of Canada Ltd. Leiden University 150 Simcoe Street Wassenaarseweg 64 London, Ontario, Canada N6A...