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Structures of repeat expansion RNAs involved in neurodegenerative diseases. Among the repeats, rCCA, rAAG, rCAA, rUUG, rCUU, rUAA and rCCU do not form any higher-order structures; rCAU, rCCG, rCUA, rCUG, rUUA, rCAG, rAUG, rCGG and rUAG form hairpins; rAGG and rUGG repeats form G-quadruplexes.
