using low concentrations of sera deficient in various complement ( c ) components and low concentrations of antibody no augmentation of immunostimulation was seen with clr-deficient human serum , c2-deficient human serum , c2,4-deficient human serum , c4-deficient guinea pig serum , c3-c9-depleted guinea pig serum ( by administration of cobra venom factor to animals ) , but stimulation was observed with c5-deficient human serum , c5-deficient mouse serum , and c6-deficient rabbit serum .
C0009498
complement
C0229671
serum