C9orf72 and amyotrophic lateral sclerosis: These data suggest that while C9orf72 ALS/FTD iPSC-MG mono-cultures do exhibit C9orf72 pathobiological phenotypes as shown in C9orf72 ALS/FTD iPSC neurons, there are no microglial cytoplasmic inclusions of TDP-43 or ADAR2.