Which biological domains are supported by GO?

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The current ontologies of the GO project are molecular function, biological process, and cellular component. The ontologies are developed to include all terms falling into these domains without consideration of whether the biological attribute is restricted to certain taxonomic groups. Therefore, biological processes that occur only in plants (e.g. photosynthesis) or mammals (e.g. lactation) are included. Other biological ontologies are discussed in the OBO web site .