Does someone have the email address of M. Picaud, CNRS UPR 407, BT 24 Ave. de la Terrasse, 91198 Gif/Yvette Cedex, FRANCE? If so, I would be greatly appreciative if you would send it to me. Thanks, J.T. Beatty Dept. of Microbiology & Immunology The University of British Columbia Room 300, 6174 University Blvd. Vancouver, BC, Canada V6T 1Z3 604-822-6896 FAX 822-6041