1. Mitotix Inc., One Kendall Square, Bldg. 600, Cambridge MA 02139, U.S.A.
2. Department of Pathology, School of Medicine, University of New Mexico, Albuquerque, NM 87131-5301, U.S.A.
3. Zymogenetics Inc., 1201 Eastlake Avenue East, Seattle, WA 98102, U.S.A.
4. Department of Biochemistry, Parke-Davis Pharmaceutical Research, 2800 Plymouth Road, Ann Arbor, MI 48105, U.S.A.
5. BASF Bioresearch Inc., 100 Research Drive, Worcester, MA 01605, U.S.A.