<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A role used to represent that a normal tissue type will only be the type of origin in some cases of the disease. The domain and the range for this role are 'Disease, Disorder or Finding' and 'Anatomic Structure, System, or Substance', respectively.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>