Figure 5.
The geometry of the 5′-end uridine. The torsion angles P–O5′ (α), O5′–C5′ (β), and C5′–C4′ (γ) are in gauche− (260°), gauche+ (64°), and trans (178°), respectively. As a result, the 5′-end uridines flip out of the tetraplex columns.
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