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Frequent TDP-43 dystrophic neurites (DNs) in the CA1 region of the brain with FTLD-TDP type A with GRN mutations (A, B). Sparse TDP-43 DNs in the CA1 region of the brain with FTLD-TDP type A without GRN mutations (C). Bar in A, 500 µm; bar in C, 20 µm for B and C.