FluoTag®-X2 anti-Mouse Immunoglobulin Kappa Light Chain is a species-specific FluoTag® directed against the kappa light chain from Mouse. In our FluoTag-X2 series, two fluorophore molecules are site-specifically coupled to one individual FluoTag molecule. The reagent therefore targets four fluorophores to your primary Mouse antibody. Due to the monovalent binding, there are no primary and secondary antibody clusters formed, leading to better epitope accessibility and a more precise localization. Since our FluoTags are recombinantly expressed, there is no batch-to-batch variation.