Table 1. Categories of information in Entrez Gene.

Subcategory	Showna	Comments
Nomenclature
Gene symbols and full descriptions	Report, Table	Sources: External authorities, GenBank, Publications. ‘LOC’+GeneID designation assigned if none of the above officially accepted nomenclature has precedence
Protein names	Report, Table	Often same as the gene name, but may be edited to make orthologs' names uniform
Gene structure and sequence
Gene structure	Report, Table	Based on annotation of the Reference sequence
Reference sequences	Report, Table, Links	The accessions are shown in the report page; the sequences are retrieved from Nucleotide or Protein
Related sequences	Report, Links	Based on cDNA or protein comparison, best genomic placement and curation. Accessions are shown in the report page; sequences are retrieved from Nucleotide or Protein
Genomic position
By sequence	Report, Links	Genomic annotation
By independent maps	Links	Shared markers or reports of cytogenetic position
Citations
Not annotated	Links	Sources: external authorities, RefSeq curation
Annotated	Report, Links	Sources: external databases, GeneRIFs
Functional annotation
Domain content	Report, Links	Conserved Domain Database (CDD)
GO terms	Report	GO Consortium
Pathways and interactions	Report, Links	KEGG, HIV Interactions Database
Disease and other phenotypes	Report, Links	External authorities such as OMIM, RefSeq curation
Homology
By Gene	Links	HomoloGene
By Protein	Links	COG
Conserved segments	Links	Map Viewer
Expression
ESTs	Links	UniGene
External resources	Links	External resource is named and used to anchor a Link. The expression data are available at that source
Arrays	Links	GEO
Related information
Integrated by Gene staff	Links	May be displayed on report as well as from Links menu
External sources	Links	LinkOut choice in Links menu

^aWhere information is shown: Report, Graphic Display; Table, Gene Table Display; Links, Links menu.