1. AECL Chalk River Laboratories Chalk River, Ontario, Canada KOJ 1J0 1 613 584-3311
2. Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken 319-11, Japan 81 292 82 5195
3. AECL Whiteshell Laboratories Pinawa, Manitoba, Canada ROE 1L0 1 204 753-2311
4. Department of Biology Ibaraki University Mito-shi, Ibaraki-ken 310, Japan 81 292 28 8379
5. Ontario Hydro Technologies 800 Kipling Avenue Toronto, Ontario, Canada M8Z 5S4 1 416 207-6274