I want to use GO, but I don't know where to begin

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There are a number of possibilities for how researchers can make use the GO.

The Gene Ontology website (http://geneontology.org/) is a very good place to begin learning about our resources, how they are produced, and how we maintain them. It also illustrates how the research community most commonly makes use of these resources and how they can contribute. Exploring the items under the "Documentation" menu will provide you with a very informative overview.