as data tracks annotating that sequence into the Genome Browser for display and analysis. The genome sequence is stored in the UCSC .2bit format and made available on the user’s remote web server, along with optional annotation data files stored in the same compressed binary formats supported by track data hubs. Track and assembly data hubs can be shared with others by providing the URL of the hub.txt file needed to load the hub. Hubs of general interest to the research community can be registered at UCSC for sharing on the Genome Browser website. We offer a growing collection of publicly shared track and assembly data hubs on the ‘Public Hubs’ tab on the Genome Browser Track Data Hubs web page (http://genome.ucsc.edu/cgi-bin/hgHubConnect), including data sets from the ENCODE AWG, the Roadmap Epigenomics Project (22) and the Blueprint Epigenome Project (30). For more information about creating and using assembly data hubs, refer to http://genomewiki.ucsc.edu/index.php/Assembly_Hubs and http://genome.ucsc.edu/goldenPath/help/hgTrackHubHelp.html.
