SMN2 and proximal spinal muscular atrophy: We generated iPSCs from fibroblasts of a wild-type (WT) control and an SMA patientwith 2 SMN2 copies (termed SMA-1) using a non-integrating Sendai virus.We obtained an additional SMA iPSC line with three SMN2 copies (termedSMA-2) from Coriell Cell Repositories (Supplementary Fig. 1B).