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The structures of the GG and CG pairs present in the crystal structure. A) The refined structures of the 1×1 nucleotide GG internal loops and the electron density that was refined; the electron density map is shown at 1.53σ. Each type of G–G pair is solvated by several water molecules. B) Refined structures of two loop-closing GC pairs; all GC pairs that close loops have the same standard Watson–Crick geometry.
