Expanded line of iso-IHC Core kits come with the components required for performing iso-IHC, except the substrate-chromogen system, which the user can select from the Core Kit Accessories. Users have the freedom to work with the chromogenic system of choice. The kit is suited for the immunohistochemical staining of mouse tissues using mouse primary antibodies. The procedure completely suppresses the strong background caused by the cross-reactivity of the anti-mouse antibody with endogenous immunoglobulins. The end result is high signal-to-noise ratios, with strong staining intensities and no background.