Pluripotent stem cell lines from HD patients (iPSHD11, iPSHD22, iPSHD34) and healthy controls (iPSRG2L, endo-iPS12, hESM01) were cultured in mTeSR1 medium (Stemcell Technologies, Canada) on a Matrigel™ substrate (BD Biosciences, USA) as described by the manufacturer. Striatal neurons were differentiated and characterized as described previously[10 (link)]. Study was approved by local ethics committee.