Using Gene Ontology Classification Fields on MGI Query Forms
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The Gene Ontology classification area of an MGI query form presents a number of options for defining or refining a query.

You can:

Note: GO vocabularies are hierarchical. Consequently, a search returns gene records annotated not only to terms matching your query but also genes annotated to more detailed terms (related to your query term but not necessarily containing the text you enter). As an example,

  1. Click Browse Gene Ontology (GO).
  2. Enter trypsin in the Query box, and click Search to get the list of molecular function terms matching this query.
  3. Click trypsin activity.
    The system returns trypsin activity [GO:0004295] followed by the number of genes and annotations found.
  4. Repeat steps 2 and 3, using serine-type endopeptidase.
  5. Click serine-type endopeptidase activity.
    Note that the result is a greater number of number of genes and annotations (than in step 3) because it includes not only the subterm (or child), trypsin activity, but also annotations to all other types of serine-type endopeptidases as well as genes annotated to the term serine-type endopeptidase activity itself.