Innovative Research's Sheep Anti Rabbit Urokinase (uPA) Polyclonal Antiserum is a frozen liquid polyclonal antibody. It's whole serum, rich in polyclonal antibodies (primarily IgG & IgM), targeting the specified antigen, and includes host antibodies, various immunoglobulins, and other serum proteins. This product is suitable for analytic tools like ELISA kits and Western blot.