MSD SULFO-TAG labeled anti-mouse antibody is a goat polyclonal antibody that binds to heavy and light chains of mouse IgG. This conjugated antibody reacts with all subtypes of mouse IgG that have been tested, including IgG1, IgG2a, IgG2b, and IgG3. MSD SULFO-TAG labeled anti-mouse antibody may be used as a secondary detection reagent to generate electrochemiluminescence in MESOSCALE DISCOVERY assays. It detects commercially available mouse antibodies in MDS assays without directly labeling them.