FUS and frontotemporal dementia: Neuropathologically, FTD can be characterized by the accumulation of different aggregates, such as TAR DNA‐binding protein 43 (TDP‐43) in 50% of cases, microtubule‐associated protein tau (MAPT) in 40% of cases, and fused in sarcoma (FUS) in another 5%–10% of cases.4