This antibody is an isotype control for rabbit IgG immunoglobulins. The antibody can be used as a negative control in immunofluorescence and flow cytometry. The rabbit IgG is highly purified from the serum of non-immunized animals. No contamination is observed at a minimun protein concentration of 20 mg/ml when tested by immunoelectrophoresis against anti-whole serums, anti-immunoglobulins (class-specific), or anti-fragment-specific antisera.