There are four member of the KChiPs (Kv4 potassium channel interacting protein) family. They are all EF hand containingproteins required for the raffic of channel formingKv4 K+ subunits to the plasma membrane (3).KChiP1 is expressed predominantly in the brain, withrelative abundance in Purkinje cells of the cerebellum, thereticular nuclei, the medial habenular nuclei, thehippocampus and the striatum (4). It is expressed in asubpopulation of parvalbumin-positve neurons, suggesting itsfunctional relationship with the GABAergic inhibitoryneurons (4).