Carboxypeptidase A2 (CPA2) Antibody Host:Rabbit Antibody Type:Polyclonal Species Reactivity:Human, mouse, rat Application:Western blot Western blotting (0.5-4 μg/ml). 3T3 cell lysate can be used as a positive control. However, the optimal concentrations should be determined individually. The antibody recognizes ~46 kDa CPA2 of human, mouse, and rat origins.