The Distributed Annotation System (DAS)
DAS is a specification of a protocol for requesting and returning annotation data for genomic regions. DAS allows sequence annotation to be stored in a decentralised manner, by multiple third-party annotators, and integrated on an as-needed basis by client-side software.
As of release 84, Ensembl no longer supports the DAS protocol. If you wish to make your data publicly accessible, we recommend creating a track hub, which provides a similar service to DAS but requires only a standard web server (or ftp site) and a few simple configuration files.
Information on how to create a track hub can be found at the UCSC Genome Browser website. The track hub format was created by the browser team at UCSC.