Suppression of HTT messenger RNA (mRNA) in Ciona intestinalis resulted in decreased motility; primary microglia from early postnatal HD mice are greatly impaired in their migration to chemotactic stimuli; compared to HTT(7Q/7Q) neuronal stem cells (NS), mutant Htt(140Q/140Q) and HTT knock‐out NS cells also showed significantly impaired motility (Kwan et al.,2012; Ritch et al.,2012; Idris, Thorndyke, & Brown, 2013). The gene discussed is HTT; the disease is Huntington disease.