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National Center for Biotechnology Information (NCBI)
The National Library of Medicine (U.S.) of the National Institutes of Health site contains links to some of the most important databases as well as providing links to a multitude of useful gene maps, and other analytical tools useful for the biological researcher.
EMBL - European Bioinformatics Institute (EBI)
The EMBL - European Bioinformatics Institute (EBI) is a centre for research and services in bioinformatics. The Institute manages databases of biological data including nucleic acid, protein sequences and macromolecular structures including: EMBL Nucleotide Sequence Database and provides downloadable analysis tools and software.