External References
Ensembl genes, transcripts, and proteins are matched to sequences and information in other biological databases. The matches are referred to as external references, or Xrefs.
Xref sources for Ensembl genes include HGNC, UCSC, the Database of Aberrant 3prime splice sites, DBASS3, and OMIM
Xref sources for Ensembl transcripts (i.e. matches to Ensembl transcript and protein sequences) include UniProtKB, CCDS, EntrezGene, and NCBI RefSeq.
Please see the General identifiers view in the transcript tab for more IDs associated with a specific Ensembl transcript and/or protein.