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Graph: Each OBO ontology is in its own named graph, with name http://purl.org/science/graph/obo/X where X is the abbreviated namespace name for the ontology (e.g. http://purl.org/science/graph/obo/GO for the Gene Ontology).
Files were downloaded 2008-09-19 or later.
A small number of ontologies have no .owl file or do not load correctly; these have been omitted.