National Center for Biotechnology Information homepage. A resource for public databases, bioinformatics tools and applications. Links to many useful sites and resources for bioinformatics software
The ExPASy (Expert Protein Analysis System) Molecular Biology Server. Maintained by the Swiss Institute of Bioinformatics (SIB). Provides links, databases and software resources for the analysis of protein sequences, structures and expression
Ensembl genome database project. A joint project between EMBL–EBI and the Sanger Institute to develop a software system which produces and maintains automatic annotation on eukaryotic genomes
UniGene, a division of GenBank automatically partitioning GenBank sequences (including genomic fragments, ESTS etc) into a non-redundant set of gene-oriented clusters