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  About the UCSC Genome Bioinformatics Site

Welcome to the UCSC Genome Browser website. This site contains the reference sequence and working draft assemblies for a large collection of genomes. It also provides portals to the ENCODE and Neandertal projects.

We encourage you to explore these sequences with our tools. The Genome Browser zooms and scrolls over chromosomes, showing the work of annotators worldwide. The Gene Sorter shows expression, homology and other information on groups of genes that can be related in many ways. Blat quickly maps your sequence to the genome. The Table Browser provides convenient access to the underlying database. VisiGene lets you browse through a large collection of in situ mouse and frog images to examine expression patterns. Genome Graphs allows you to upload and display genome-wide data sets.

The UCSC Genome Browser is developed and maintained by the Genome Bioinformatics Group, a cross-departmental team within the Center for Biomolecular Science and Engineering (CBSE) at the University of California Santa Cruz (UCSC). If you have feedback or questions concerning the tools or data on this website, feel free to contact us on our public mailing list.

The Genome Browser project team relies on public funding to support our work. Donations are welcome -- we have many more ideas than our funding supports! Give to the UCSC Genome Browser

  NewsFollow GenomeBrowser on Twitter

To receive announcements of new genome assembly releases, new software features, updates and training seminars by email, subscribe to the genome-announce mailing list.


19 June 2014 - Conservation Track Released for Rat

We are pleased to announce the release of a new Conservation track based on the rat (RGSC 5.0/rn5) assembly. This track shows multiple alignments of 13 vertebrate species and measurements of evolutionary conservation using two methods (phastCons and phyloP) from the PHAST package for all species. The multiple alignments were generated using multiz and other tools in the UCSC/Penn State Bioinformatics comparative genomics alignment pipeline. Conserved elements identified by phastCons are also displayed in this track. For more details, visit the track description page.

With the release of this new conservation track for the rat (RGSC 5.0/rn5) assembly, we have changed the default rat browser on our website from rn4 to rn5. In general, the Genome Browser will continue to display whichever rat assembly you are already viewing, however, by default it will go to the rn5 assembly for users that haven't recently viewed a rat assembly. However, there are circumstances in which the assembly may switch to the newer version (for instance, if you reset your browser to the defaults). If you find yourself in a situation where some of your favorite browser tracks have "disappeared", you may want to check that you're viewing the right assembly.

We would like to thank Pauline Fujita, Matthew Speir, and Hiram Clawson for their efforts in creating this track.


30 May 2014 - New Human Variation Track Now Available

We are pleased to announce the release of the new Exome Variant Server (EVS) Variants track. The EVS, maintained by the Nickerson lab at the University of Washington, contains variant annotations for over 6,500 exomes that were sequenced as part of the NHLBI GO Exome Sequencing Project (ESP). This annotation includes information such as function, clinical association, dbSNP rsID, average sample read depth, and much more. You can find more information on how the data for this track was generated on the track description page.

We would like to acknowledge Tim Dreszer and Matthew Speir for their hard work in creating this track.


22 May 2014 - New Roadmap Epigenomics Integrative Analysis Hub now available: We are pleased to announce the addition of the Roadmap Epigenomics Integrative Analysis Hub to our list of publicly available track hubs. Read more

15 May 2014 - We're happy to announce the release of a new UCSC Genes track for the GRCh38/hg38 human Genome Browser. Read more


  Conditions of Use

The Genome Browser software, sequence and annotation data are freely available for use with these conditions. A license is required for commercial use of the software. For assistance with questions or problems regarding the UCSC Genome Browser software, database, genome assemblies, or release cycles, click here.

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.

The UCSC Genome Browser was created by the Genome Bioinformatics Group of UC Santa Cruz. Software Copyright (c) The Regents of the University of California. All rights reserved.