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Brucella vaccine and gene co-citation network. All Brucella vaccine terms in VO were used. This co-citation network was generated without (A) or with (B) VO hierarchy. VO terms are shown in green and Brucella gene in red. The line depth between VO vaccine terms and Brucella gene symbols represents the relative number of documents with each pair of VO vaccine terms and Brucella genes are co-cited. The terms and edges in yellow were inferred from the VO hierarchy.
