using frozen tissue sections , a monoclonal antibody ( wi 691-13-17 ) known to detect an epitope common to all dr alloantigens on the beta ( light ) chain of dr antigens , and a two-step indirect immunoperoxidase technique , dr antigens were found on all metastatic lesions tested and on many primary tumors and their histogenetic precursors .
C0003316
epitope
C0003320
antigens