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There are currently three gene ontologies, described in this table:
Molecular Function
Ontology
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the tasks performed by individual gene products; examples are transcription factor and DNA helicase
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Biological Process
Ontology
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broad biological goals, such as mitosis or purine metabolism, that are accomplished by ordered assemblies of molecular functions
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Cellular Component
Ontology
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subcellular structures, locations, and macromolecular complexes; examples include nucleus, telomere, and origin recognition complex
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