The Cell Ontology (CL) is a candidate OBO Foundry ontology for the representation of cell types. First described in 2005, the CL integrates cell types from the prokaryotic, fungal, and eukaryotic organisms. As a core component of the OBO Foundry, the CL merges information contained in species-specific anatomical ontologies as well as referencing other OBO Foundry ontologies such as the Protein Ontology (PR) for uniquely expressed biomarkers and the Gene Ontology (GO) for the biological processes a cell type participates in. The CL is under continuous revision to expand representation of cell types and to better integrate with other biomedical ontologies.

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