Protein expression of CACNA2D2 showing virtual absence of expression in the proband (II:1) and ~50% reduction in the parents (I:1 and I:2). The MRI of the proband showed marked cerebellar atrophy. CACNA2D2 is highly expressed in cerebellar Purkinje cells. Image modified from Pippuci and collaborators under a Creative Commons licence (http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0082154)