Other ALS studies have also shown neuroprotective deficits in SOD1 mutant hiPSC-astrocytes (Tyzack et al. 2017) and deleterious effects of conditioned media from C9orf72 mutant hiPSC-astrocytes on neurons (Birger et al. 2019). The gene discussed is C9orf72; the disease is amyotrophic lateral sclerosis.