<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>The NCBI_Taxon_ID property is used to establish correspondence between the NCI Thesaurus concept representing a taxon (species) and the NCBI/NLM Species Taxonomy ID assigned by the NCBI to that taxon.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>