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.

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

We are pleased to announce the release of dbSNP build 131, available from on the human assembly (GRCh37/hg19). The dbSNP build 131 is available at NCBI. The SNPs (131) track contains 26,033,053 mappings of 23,445,889 reference SNPs that have been mapped to the reference genome by dbSNP. This is a significant increase from the provisional hg19 mappings of build 130 (18,404,149 mappings of 17,512,501 SNPs).

You will find the SNPs (131) track on the Human Feb. 2009 (GRCh37/hg19) browser in the "Variation and Repeats" group.

Many thanks to dbSNP at NCBI for the data. The track was produced at UCSC by Angie Hinrichs and Mary Goldman.

3 June 2010 - Updated Marmoset Genome Browser Available: We have released an updated Genome Browser for the marmoset, Callithrix jacchus. Read more.

12 May 2010 - Pig Genome Browser Released: We have released a Genome Browser for the pig, Sus scrofa. Read more.

6 May 2010 - UCSC Hosts Portal for Neandertal Sequence, Alignments, and Analyses: In conjunction with the publication of the paper Green et al. A Draft Sequence of the Neandertal Genome in the May 7 issue of Science, the UCSC Genome Browser project has released a public Neandertal portal that may be used to access the Neandertal sequence, alignments to the UCSC hg18 (NCBI Build 36) human reference assembly and the UCSC panTro2 (Chimpanzee Sequencing and Analysis Consortium v2.1) chimpanzee reference assembly, and several associated analyses. Read more.

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.