<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A role used to assert that an active ingredient of a drug or chemical agent influences a biological process. The role implies a direct association with a target biological molecule or complex involved in the process. The domain and range for this role are 'Drug, Food, Chemical or Biomedical Material' and 'Biological Process', respectively.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>