Entrez Gene

Provides a unified query environment for genes defined by sequence and/or in NCBI's Map Viewer

 Entrez Genome

Provides views for a variety of genomes, complete chromosomes, sequence maps with contigs, and integrated genetic and physical maps

Entrez Nucleotide

Contains sequence data from GenBank, EMBL, and DDBJ, the members of the tripartite, international collaboration of sequence databases

 Entrez PopSet

Contains aligned sequences submitted as a set resulting from a population, phylogenetic, or mutation study

These alignments describe such events as evolution and population variation. The PopSet database contains both nucleotide and protein sequence data.

Entrez Protein

Contains sequence data from the translated coding regions from DNA sequences in GenBank, EMBL, and DDBJ as well as protein sequences submitted to Protein Information Resource (PIR), SWISS-PROT, Protein Research Foundation (PRF), and Protein Data Bank (PDB) (sequences from solved structures)

 Entrez Structure

Also Molecular Modeling Database (MMDB)Contains experimental data from crystallographic and NMR structure determinations

The data for MMDB are obtained from the Protein Data Bank (PDB).

Homologene, Discover Homologs

A system for automated detection of homologs among the annotated genes of several completely sequenced eukaryotic genomes

 NCBI Map Viewer

Supports search and display of genomic information by chromosomal position

Regions of interest can be retrieved by text queries (e.g., gene or marker name) or by sequence alignment (BLAST)

OMIM (Online Mendelian Inheritance in Man)

Single Nucleotide Polymorphism

A central repository database for both single- base nucleotide substitutions and short-deletion and insertion polymorphisms.

 Taxonomy Browser

Contains the names of all organisms that are represented in the NCBI genetic database by at least one nucleotide or protein sequence

   UniGene: An Organized View of the Transcriptone

An experimental system for automatically partitioning GenBank sequences into a non-redundant set of gene-oriented clusters

Each UniGene cluster contains sequences that represent a unique gene, as well as related information such as the tissue types in which the gene has been expressed and map location.