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RNA structures of different repeat tracts containing 60 repeats predicted using Mfold [32,33,34]. Predictions were made using default settings, and structures having the lowest free energy of formation are presented. (A) Hairpin structure predicted for the pure CAG repeat tract; (B) the (CAG)4(CAA)2 repeat tract; (C) the (CAG)3(CAA)2 tract; (D) the (CAG)3CAA tract; and (E) the (CAG)2CAA tract.
