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Modeling and application of vaccine adjuvants in the Vaccine Ontology (VO). (a) The hierarchical structure of vaccine adjuvants in VO. (b) All the vaccines that use this adjuvant. The usage information is obtained by a SPARQL query based on the logical definitions of vaccines. The website that contains this information is http://purl.obolibrary.org/obo/VO_0000884.
