GRN and frontotemporal dementia: To date, neuronal lines have been generated from iPSCs derived from FTD patients with heterozygous and homozygous GRN pathogenic variants, including p.A9D, p. S116X, p.T272SfsX, p.R493X, IVS1 + 5G>C [27,28,29,30,31], reviewed in [3,32].