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Representative folding of a random coil into an iM for oligos differing by loop length and position: (A) a reference structure (T1) where all loops contain one thymine (colored spheres); (B) first (green; Mod1 oligos), (C) central (blue; Mod2 oligos), and (D) third (yellow; Mod3 oligos) loops have 3-20 thymines.
