<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Contains a Concept Unique Identifier for those concepts that appear in NCI Metathesaurus but not in the NLM UMLS.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>