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Ribose–phosphate interactions in the phosphodiester backbone of the bulge of the box C/D K-turn. Parallel-eye stereoscopic view of the isolated bulge region showing two hydrogen bonds. That from the 2′-OH of L3 to the proS nonbridging O atom of the L1/L2 phosphate bridges across the tight turn of the bulge. The other is from the 2′-OH of L2 to the proS nonbridging O atom of the L2/L3 phosphate.
