Purkinje CellsPurkinje FibersCerebellumCerebellar CortexMice, Neurologic MutantsDendritesCerebellar NucleiOlivary NucleusAction PotentialsCalbindinsNerve FibersAtaxiaS100 Calcium Binding Protein GSynapsesCerebellar AtaxiaMice, Inbred C57BLSpinocerebellar AtaxiasHeart Conduction SystemCalcium Channels, P-TypeNerve Tissue ProteinsMice, TransgenicPatch-Clamp TechniquesAnimals, NewbornElectric StimulationCerebellar DiseasesNeuronsExcitatory Amino Acid Transporter 4HarmalineNerve DegenerationLong-Term Synaptic Depression