ATXN1 and Tremor: We found that pan-neuronal expression of UAS-poly-CAG (a peptide consisting of 63 polyglutamine repeats) (Kazemi-Esfarjani and Benzer, 2002), UAS-mutant-ATXN1 [expanded polyglutamine repeat form of ataxin-1 (ATXN1), the causative gene for spinocerebellar ataxia 1] (Fernandez-Funez et al., 2000) and UAS-mutant-HTT [mutant expanded polyglutamine repeat form of huntingtin (HTT), the causative gene for Huntington's disease] (Barbaro et al., 2015) did not result in tremor (Fig. S1A).