This site contains archived older assemblies of selected organisms from the UCSC Genome Browser database. To access the latest assemblies of these organisms, go to the UCSC Genome Browser.

Assemblies listed in the menu to the left may be viewed in the Genome Browser by clicking the corresponding link. Most datasets that predate mid-2002 are no longer available for browsing. Data downloads and liftOver files for all archived assemblies (including those without browsers) are available from the Downloads page on this server. Due to resource limitations, we are unable to provide Blat servers for archived releases.

Note that alignments of GenBank sequences will likely not work properly on this site, as the alignments are continuously updated and are not maintained here. Similarly, many links to UCSC and outside sites may fail as they age.

• Chromosome Reports
• Genome Map Plots

The sequence and annotation data displayed in the Genome Browser are freely available for any use with the following conditions:

• Genome sequence data use restrictions are noted within the species sections on the Credits page.
• Some annotation tracks contributed by external collaborators contain proprietary data that have specific use restrictions. To check for restrictions associated with a particular genome assembly, review the database/README.txt file in the assembly's downloads directory.

The UCSC, Ensembl, and NCBI browser and annotation groups have established a common set of minimum requirements for public display of genome data made available after Spring 2009, described here.

The Genome Browser and Blat software are free for academic, nonprofit, and personal use. A license is required for commercial use. See the Licenses page for more information.

Program-driven use of this software is limited to a maximum of one hit every 15 seconds and no more than 5,000 hits per day.

For assistance with questions or problems regarding the UCSC Genome Browser software, database, genome assemblies, or release cycles, see the FAQ.