in contrast , immunoglobulin m purified from the serum of a cow injected 7 days previously with heat-killed b. abortus bound to the antigen by its fab portion , was not labile to edta treatment , cross-reacted extensively with y. enterocolitica serotype o:9 , and agglutinated various other bacterial antigens and normal erythrocytes .
C0003320
antigen
C0003321
bacterial