The Anti-Mouse IL-21R (Clone 4A9) - Purified in vivo GOLD™ Functional Grade - 50 mg Antibody from Leinco Technologies, Inc. is a Rat Monoclonal antibody to IL21, and Interleukin 21. This antibody recognizes Mouse antigen. The Anti-Mouse IL-21R (Clone 4A9) - Purified in vivo GOLD™ Functional Grade - 50 mg Antibody has been validated for the following applications: Precipitation, Blotting, In Vivo, Flow Cytometry, and Immunoprecipitation.