Entrez Gene
Original Web Site: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene
With the sequencing and annotation of key genomes, having a gene-based view of the resultant information is useful. Entrez Gene has therefore been implemented to supply key connections in the nexus of map, sequence, expression, structure, function, citation, and homology data. Unique identifiers are assigned to genes with defining sequences, genes with known map positions, and genes inferred from phenotypic information. These gene identifiers are used throughout NCBI's databases and tracked through updates of annotation and related information. Entrez Gene covers genomes represented by NCBI Reference Sequences (or RefSeqs) and is integrated for indexing and query and retrieval from NCBI's Entrez and E-Utilities systems.
