Gallus gallus Photo courtesy of Bill Payne, Michigan State University (NHGRI Press Photos)

The February 2004 chicken (Gallus gallus) v1.0 draft assembly was produced by the Genome Sequencing Center at the Washington University School of Medicine in St. Louis.

### Sample position queries

A genome position can be specified by the accession number of a sequenced genomic supercontig, an mRNA or EST, a chromosomal coordinate range, or keywords from the GenBank description of an mRNA. The following list shows examples of valid position queries for the chicken genome. See the User's Guide for more information.

Request: |  | Genome Browser Response:
--- | --- | ---
chrZ |  | Displays all of chromosome Z
chr3:1-1000000 |  | Displays first million bases of chr 3
chr3:1000000+2000 |  | Displays a region of chr 3 that spans 2000 bases, starting with position 1000000
Contig44 |  | Displays region of assembly for the supercontig with ID contig44
Contig44.48 |  | Displays region of assembly for the contig with ID contig44.48
BX950328 |  | Displays region of mRNA with GenBank accession number BX950328
BU335953 |  | Displays region of EST with GenBank accession BU335953 on chr Z
chr13_3.145 |  | Displays region of genome containing Genscan gene prediction chr13_3.145
CWNT-8C |  | Displays region of genome with gene symbol CWNT-8C
NM_204735 |  | Displays the region of genome with RefSeq identifier NM_204735
374180 |  | Displays the region of genome with Entrez Gene identifier 374180
ENSGALT00000023622 |  | Displays the region of genome with Ensembl identifier ENSGALT00000023622. NOTE: Due to space constraints, the Genome Browser displays abridged Ensembl identifiers, but the full ID name must be used in searches. For example, the ENSGALT00000023622 identifier displays as ENSGAL23622 in the Genome Browser.
pseudogene mRNA |  | Lists transcribed pseudogenes, but not cDNAs
homeobox caudal |  | Lists mRNAs for caudal homeobox genes
zinc finger |  | Lists many zinc finger mRNAs
kruppel zinc finger |  | Lists only kruppel-like zinc fingers
zhang |  | Lists mRNAs deposited by scientist named Zhang
Taguchi,T. |  | Lists mRNAs deposited by co-author T. Taguchi
Use this last format for author queries. Although GenBank requires the search format Taguchi T, internally it uses the format Taguchi,T..

### Assembly details

The genome has been sequenced to 6.63X coverage. Approximately 88% of the sequence has been anchored to chromosomes, which include autosomes 1-24, 26-28, and 32, and sex chromosomes W and Z. (In contrast to mammals, the female chicken is heterogametic (ZW) and the male is homogametic (ZZ).) The remaining unanchored contigs that could be localized to a chromosome have been concatenated into the virtual chromosomes "chr*_random", separated by gaps of 10,000 bp. Unanchored contigs that could not be localized to a chromosome have been concatenated into the virtual chromosome "chrUn", separated by gaps of 1,000 bp in order to reduce the total size of chrUn. The chicken mitochondrial sequence is also available as the virtual chromosome "chrM".

WARNING: This release of the G. gallus chrW contains some sequence that is not specific to chromosome W. A large portion of the chromosome was assigned to W based on the presence of W-specific repeats which, as it has now been shown, are not W-specific. Thus, the only portions of chrW which should currently be considered specific to W are:

- chrW:1-195,831
- chrW:4,895,452-4,916,845
- chrW_random (all)

Bulk downloads of the sequence and annotation data are available via the Genome Browser FTP server or the Downloads page. These data have specific conditions for use. The chicken browser annotation tracks were generated by UCSC and collaborators worldwide. See the Credits page for a detailed list of the organizations and individuals who contributed to the success of this release.