Claspin Antibody Host:Rabbit Antibody Type:Polyclonal Species Reactivity:Human Application:Western blot, Immunoprecipitation Western blotting (1:500 – 1:2000) and Immunoprecipitation. HeLa cell extract can be used as a positive control. However, the optimal concentrations should be determined individually. The antibody recognizes the Claspin of human origin. Reactivity to other species has not been tested.