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An ontology is a controlled vocabulary of terms or concepts and a restricted set of relationships between those terms. Consistency is important!

Sequence Ontology

The Sequence Ontology (SO) defines the sequence features used in biological sequence annotation.

See https://github.com/The-Sequence-Ontology/SO-Ontologies

Gene Ontology

The Gene Ontology is a controlled vocabulary that connects each gene to one or more functions. There are three structured, independent sub-ontologies that describe gene products in a species-independent manner:

  • Cellular component: where does the product exhibit its effect?
  • Molecular function: how does the product work?
  • Biological process: what is the purpose of the product?