MGI contains orthology information for mouse, human and other mammalian organisms. An orthology record shows the symbol, organism, chromosome, cM position, cytogenetic band, and accession ID for each gene in the set of orthologies. Available links to other resources appear as well (e.g., Entrez Gene, HGNC, UniProt, RGD).

Every orthology assertion is supported by one or more references. The display of an orthology reference includes the J number of the reference, a short format citation, gene symbol, and organism. See What's in a Mammalian Ortholology Query Results report? for more detail.

Orthology information is presented in other formats: comparative map and Orthology Map View.

The comparative map display relies on the Linkage Map application to build a graphic display of a map of a mouse chromosome (or chromosomal region) which includes orthologies from the comparison organisms. See, for example, the comparative map for a 2 cM region around the mouse gene Chrng showing human orthology.

The Orthology Map View displays the mouse genome as the consensus genetic map, with either human or rat orthologs labeled by chromosome of origin and displayed next to the corresponding segment of the mouse genome. The Orthology Map View is accessible from the Mammalian Orthology section of the All Search Tools page, or the Mammalian Orthology section of the Search menu.