Ensembl 'FeatureView' displays all locations at which a particular biological feature like a protein, a mRNA, an EST or a microarray probe set has been annotated on the genome sequence assembly.
A chromosome ideogram at the top of the page views feature locations graphically, while a table at the bottom provides full details of individual matches in physical coordinates. In the chromosome ideogram red triangles indicate the location of mapped features. If a microarray probe maps to an exon of an Ensembl gene, the location of the gene is indicated by a blue triangle. Clicking on a triangle gives a pop-up menu which contains a link to ContigView.
Table columns are as follows: 'Genomic Location' shows the chromosome, basepairs, and strand (1 is forward and -1 is reverse) for the genomic sequence at the position of the match to the feature. 'Genomic length' shows the length of this sequence. 'Feature location' reveals the name of the feature and the length and position of the hit within the feature. 'Alignment length' shows the length of the hit of the feature to the assembly. 'Rel ori' reveals in which direction the feature aligns to the assembly (1 is forward and -1 is reverse, as above). '%id (%identity), score and p-value' are BLAST statistics.
Ensembl 'FeatureView' pages are generally linked from pop-up windows on Ensembl 'ContigView' pages. Pointing at a particular feature like a protein or an mRNA displays a pop-up window with a "View all hits" option.
Select a Feature
Following the "Select another feature" link provides a form, which allows selecting another biological feature for display. Accession numbers from UniProt, EMBL, RefSeq, UniGene and other databases, as well as microarray identifiers from all those arrays currently mapped to the genome sequence can be used to locate a feature.
Configure Display Options
Display options for the karyotype ideogram can be further adjusted. If features are annotated too densly, the chromsome ideograms could be stretched adjusting the "Height of the longest chromosome" option.
Ensembl 'KaryoView' allows for similar annotation of karyotype ideograms with custom data sets.
The search box at the top of the page allows you to search for any identifier present in Ensembl. For detailed instructions see the Ensembl 'TextView' page.