1. Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, Centre Medical Universitaire, Geneva 4, Switzerland
2. Protein Information Resource, University of Delaware, Newark, DE, USA
3. European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridge, UK
4. National Center for Biotechnology Information (NCBI), US National Library of Medicine, Bethesda, MD, USA
5. Protein Information Resource, Georgetown University Medical Center, Washington, DC, USA