Neurexin Antibody Host:Rabbit Antibody Type:Polyclonal Species Reactivity:Human, rat, Bovine Application:Western blot Western blotting (1:200-1000). However, the optimal concentrations should be determined individually. The antibody recognizes both alpha (~170 kDa) and beta (~50 kDa) isoforms of Neurexin in samples from human, rat, and bovine origins. Reactivity to other species has not been tested.