The “beyond ion channel diseases” group's (cluster 2) most common MeSH terms about 6 years ago were “progressive myoclonic epilepsies” (AAY: 2013.0), “CDKL5” (AAY: 2013.3), and “sequence deletion” (AAY: 2013.3). This evidence concerns the gene CDKL5 and progressive myoclonus epilepsy.