<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A heterogeneous antibody derived from a host organism, typically produced by immunization of a suitable mammal with an antigen which induces B-lymphocytes to produce IgG immunoglobulins specific for the antigen. The resulting collection of antibodies have specificity for different epitopes of the antigen.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>