igm fraction of serum containing rf activity ( igm-rf ) , igm isolated from pooled normal human serum and have no rf activity ( igm-control ) , bovine serum albumin , and veronal buffered saline solutions were used in a c3b assay system consisting of aggregated human igg ( agghuigg ) coupled to sheep erythrocytes ( srbc ) with guinea pig and normal human serum complement .
C0229671
serum
C0009498
complement