<prompt> All of the following are neurologic channelopathies, except?Hypokalemic periodic paralysisEpisodic ataxiasFamilial hemiplegic migraineHuntingtons disease  <response>: Choice 1 and 3 are calcium channel defect. Choice 2 is potassium channel defect. Huntington disease is a disorder of trinucleotide repeats due to Huntington gene on chromosome 4. 