Although a standard GO annotation is simply a statement about the function of a gene product, there is a lot more to an annotation that just a GO term and a gene product. The Gene Association File (GAF), currently version 2.2, is a tab-deliminated file with 17 fields that record everything from the database of the identifier for the gene product to the curation group that created the annotation.
Find more information on GAF 2.2 at the GO website: GO Annotation File (GAF) format
You can grab GAFs for your organism here:
- Downloads page: Download Annotations | Gene Ontology Consortium
- current.geneontology.org : Directory index for http://current.geneontology.org/annotations
- Also find the GAF link on the QuickGO page:
