Based on antigen-binding assay, Western blotting, and/or ELISA, the antibody reacts with the light chains on rabbit IgG and with those common to other rabbit immunoglobulins. The antibody does not react with the heavy chain of rabbit IgG. The antibody has been tested by ELISA to ensure minimal cross-reaction with bovine, goat, armenian hamster, horse, human, mouse, rat and sheep immunoglobulins, but it may cross-react with immunoglobulins from other species.