Source:http://linkedlifedata.com/resource/umls/id/C1709693
NCI: A role used to assert a relationship between a procedure and an anatomy concept, specifically that a particular procedure is sometimes associated with the target anatomy. This role should be used when a more specific role cannot be asserted, including procedures targeting blood and other fluids. The domain and range for this role are 'Clinical or Research Activity' and 'Anatomic Structure, System, or Substance', respectively.