Specificity: Recognizes C2 from human plasma/serum. Epitope specificity differs from that of LS-C22277 and LS-C22278 as determined by inhibition ELISA. Reacts strongly with C2. Strong reaction is seen with human serum/plasma and no reaction is seen with serum from patients deficient in C2, when tested in sandwich ELISA with a polyclonal antibody against C2. In ELISA, reaction is also seen with C2 directly coated onto the microtiter well.