Institution: | (1) Basic Research Unit, Helsinki Institute for Information Technology, University of Helsinki, Helsinki, Finland;(2) National Center for Biotechnology Information, National Institutes of Health, Bethesda, MD 20894, USA;(3) National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA;(4) Present address: School of Biology, Georgia Institute of Technology, Atlanta, GA 30332, USA |