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Amyotrophic lateral sclerosis (ALS) and frontotemporal lobe degeneration (FTLD) are two inter-related intractable diseases of motor neuron degeneration. Fused in sarcoma (FUS) is found in cytoplasmic accumulation of ALS and FTLD patients, which readily link the protein with the diseases. The RNA recognition motif (RRM) of FUS has the canonical α-β folds along with an unusual lysine-rich loop (KK-loop) between α1 and β2. This KK-loop is highly conserved among FET family proteins. Another contrasting feature of FUS RRM is the absence of c