AmiGO Manual: Browse
The AmiGO term browser allows you to view and navigate the terms in the Gene Ontology.
Tree View
AmiGO presents the ontology as a tree structure; this view is available from the Browse link in the menu bar on each page, and in the Term Lineage section of the term details page.
An example of part of the GO tree under biological process is displayed below:
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<a href="#" title="View details of biological_process"> GO:0008150 : biological_process </a> <a href="#" title="View 131450 gene product associations to biological_process and/or its children">[131450] </a> <a class="img" href="#" title="Click for bar chart of gene product association distribution among biological_process"> 
</a>
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</a> <a href="#" title="View details of cellular process"> GO:0009987 : cellular process </a> <a href="#" title="View 78581 gene product associations to cellular process and/or its children">[78581] </a> - <a class="img" href="#" title="Open this node"> </a> <a href="#" title="View details of development"> GO:0007275 : development </a> <a href="#" title="View 14701 gene product associations to development and/or its children">[14701] </a>
- <a class="img" href="#" title="Open this node"> </a> <a href="#" title="View details of developmental maturation"> GO:0021700 : developmental maturation </a> <a href="#" title="View 219 gene product associations to developmental maturation and/or its children">[219] </a>
- <a class="img" href="#" title="Open this node"> </a> <a href="#" title="View details of growth"> GO:0040007 : growth </a> <a href="#" title="View 3448 gene product associations to growth and/or its children">[3448] </a>
- <a class="img" href="#" title="Open this node"> [[Image:icon-plus.png|open"> </a> [[Image:icon-is_a.gif|is_a relationship"> <a href="#" title="View details of interaction between organisms"> GO:0051704 : interaction between organisms </a> <a href="#" title="View 1530 gene product associations to interaction between organisms and/or its children">[1530] </a>
- <a class="img" href="#" title="Open this node"> </a> <a href="#" title="View details of physiological process"> GO:0007582 : physiological process </a> <a href="#" title="View 81592 gene product associations to physiological process and/or its children">[81592] </a>
- <a class="img" href="#" title="Close this node"> </a> <a href="#" title="View details of pigmentation"> GO:0043473 : pigmentation </a> <a href="#" title="View 122 gene product associations to pigmentation and/or its children">[122] </a> <a class="img" href="#" title="Click for bar chart of gene product association distribution among pigmentation"> </a>
- <a class="img" href="#" title="Close this node"> </a> <a href="#" title="View details of pigment accumulation"> GO:0043476 : pigment accumulation </a> <a href="#" title="View 4 gene product associations to pigment accumulation and/or its children">[4] </a> <a class="img" href="#" title="Click for bar chart of gene product association distribution among pigment accumulation"> </a>
<a href="#" title="View details of cellular pigment accumulation"> GO:0043482 : cellular pigment accumulation </a> <a href="#" title="View 0 gene product associations to cellular pigment accumulation">[0] </a>- <a class="img" href="#" title="Open this node"> </a> <a href="#" title="View details of pigment accumulation in response to UV light"> GO:0043478 : pigment accumulation in response to UV light </a> <a href="#" title="View 4 gene product associations to pigment accumulation in response to UV light and/or its children">[4] </a>
- <a class="img" href="#" title="Open this node"> </a> <a href="#" title="View details of pigment accumulation in tissues"> GO:0043480 : pigment accumulation in tissues </a> <a href="#" title="View 4 gene product associations to pigment accumulation in tissues and/or its children">[4] </a>
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<a href="#" title="View details of pigment metabolism during pigment accumulation"> GO:0043475 : pigment metabolism during pigment accumulation </a> <a href="#" title="View 0 gene product associations to pigment metabolism during pigment accumulation and/or its children">[0] </a>
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The tree structure holds information about GO terms and the relationships between them. Indentation is used to represent term parentage, with more specific terms - known as child terms or subclasses - being indented with respect to their parent terms. Terms with the same level of indentation are referred to as siblings.
Each line in the tree view contains the GO ID and the GO term name; clicking on the ID or name will open the <a href="help-term_details.shtml">Term Details</a> page, containing more information about the GO term.
Term lines in detail
GO:0043476 : pigment accumulation [4] 
The first icon on each line represents information about the children of the GO term. A 
icon means that the term has child term(s) which are not shown in the current view; to view the children, click the icon.
A icon means that the term has been selected and all of its children are shown in the tree (as pigmentation is in the tree shown above). The node can be collapsed, hiding the children of the term, by clicking the icon.
The 
icon means that the term is a leaf node which does not have children.
GO:0043476 : pigment accumulation [4]
The second icon represents the relationship of the term to its parent term. GO uses two relationships, is_a, represented by the icon, and part_of, represented by the 
icon.
The GO ID and the GO term name are followed by two additional pieces of information.
GO:0043476 : pigment accumulation [4]
The number in brackets after the term name represents the number of genes and gene products that have been annotated to that GO term and its children. Clicking on the number will take you to a full list of the genes and gene products that have been annotated to that GO term and its children.
If you have any filters active, the number displayed may change to reflect the filter. For example, selecting a filter to only look at genes or gene products from FlyBase will lower the number. For the evidence code and species filters, the numbers of genes associated to a term cannot be easily computed and AmiGO does not show a number.
GO:0043476 : pigment accumulation [4]
If a GO term is fully expanded (i.e. all its children GO terms are displayed), a bar chart icon will appear at the end of the line. Clicking on this icon will generate a <a href="help-barchart.shtml">bar chart</a> showing the distribution of genes and gene products associated with that GO term and its children.
Viewing Options
The links box gives users to view or save the tree they have created. Graphical View shows the tree as a graph using the GraphViz plug in, and users can then download a GraphViz dot file; Permalink provides a stable link to the tree. The tree can also be downloaded as GO RDF-XML or GO flat file format.
Filtering
The tree can be filtered by ontology to limit the display to the selected ontology or ontologies; the default is to display all ontologies.
The gene product counts displayed next to each term can be filtered to show the number of gene products from the selected data source(s). At present, evidence code and species filters are not available as the association count is difficult to calculate, and if you currently have these filters set, an additional checkbox will appear, allowing you to reset them.
Multiple options can be selected in both ontology and data source filters; select more than one option by control-clicking (apple-click on a Mac) the names. Click Set filters to set your display options. If no options are selected or you click Remove all filters, AmiGO will display all ontologies with full association counts.