The main Ensembl site www.ensembl.org is updated with the latest data on a monthly basis.
The Ensembl Archive sites have been set up so there is a stable link for at least two years to pages from a particular release (e.g. version 26 from November 2004) in Ensembl.
These links will be suitable for referring to Ensembl pages in publications.
A selection of older archives are being maintained, but the availability of these sites cannot be guaranteed.
The Archive Ensembl sites, (e.g. http://Nov2004.archive.ensembl.org), have the format: http://<three-letter-month><year>.archive.ensembl.org
In the lefthand (yellow) column of each current Ensembl page, there is a link called 'Stable archive link to this page', which links to the corresponding permanent page in the Ensembl Archive. A similar link on each archive page links back to the current site (i.e. www.ensembl.org). Note that prior to the site redesign in Version 32, return links from the archive were in the form of a graphical button at the foot of the page.
If you are looking at the MapView page for human chromosome 1 on the main Ensembl site in November 2004 when Ensembl 26 was the current version, the URL would be:
and the equivalent archived page URL would be:http://Nov2004.archive.ensembl.org/Homo_sapiens/mapview?chr=1