Entrez Gene is a searchable database of genes, from RefSeq genomes, and defined by sequence and/or located in the NCBI Map Viewer

Online text-based search and retrieval system used at NCBI for finding nucleic acids by keywords, id number, database number, etc.

UniGene: An Organized View of the Transcriptome. Each UniGene entry is a set of transcript sequences that appear to come from the same transcription locus (gene or expressed pseudogene), together with information on protein similarities, gene expression, cDNA clone reagents, and genomic location.

The European Nucleotide Archive (ENA) provides a comprehensive record of the world's nucleotide sequencing information, covering raw sequencing data, sequence assembly information and functional annotation.

The system allows the user to search globally across all EBI databases or individually in selected resources by using an Advanced search.

MRS: A fast and compact retrieval system for biological data.

DBGET is an integrated database retrieval system for handling the web of molecular biology databases

An online launcher for varied sequence anlaysis including homology search, alignment, structure prediction, and varied utilities such as primers or sequence conversion.