Stat1 Antibody Host:Rabbit Antibody Type:Polyclonal Species Reactivity:Human, mouse, rat Application:Western blot Western blotting (0.5-4 μg/ml). However, the optimal conditions should be determined individually. The antibody recognizes both alpha (91 kDa) and beta (84 kDa) subunits of STAT1 in samples from human, mouse, and rat origins.