SOD1 and amyotrophic lateral sclerosis: Figure 5—figure supplement 1 provides quantification of average cell density within hESC-derived forebrain and spinal neuroepithelial tissues for each experimental condition. Figure 5—figure supplement 2 shows a representative image and quantification of polarization foci/rosettes per forebrain tissue derived from D90A SOD1 mutant ALS-iPSCs. Scale bars are (B, F) 200 μm.