OntoFox retrieval of the term ' homo sapiens ' from the NCBI Taxonomy Ontology (NCBITaxon). Input data can be entered via web-based forms (A) or text file upload (B). The output OWL file [Additional file 1] can be visualized using Protégé (C). All terms from 'homo sapiens' up to Eukaryota are retrieved. Synonyms used to annotate each term are also included.