guinea pigs of inbred strain 2 and of a strain deficient in complement component 4 ( c4d ) responded to intradermal infection with treponema pallidum by production of antibodies to treponemal antigens , normal rabbit serum proteins , fibronectin , and creatine kinase and with formation of circulating immune complexes ( ic ) .
C0009516
complement component
C0056195
c4d