1. GTC Sequencing Center, Genome Therapeutics Corporation, Waltham, Massachusetts 024531;
2. Department of Pathology, Uniformed Services University of the Health Sciences,2 and
3. The National Center for Biotechnology Information, The National Institutes of Health,3 Bethesda, Maryland 20814;
4. INSA, Departement de Genie Biochimique, 31077 Toulouse cedex, France4; and
5. Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 770055