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Structural comparisons of the complexes. (a) RNase A–U5P (yellow) and RNase A–UDP (green). (b) RNase A–U-2′-p (green) and RNase A–U5P (white). (c) RNase A–U-3′-p (green) and RNase A–U5P (white). (d) RNase A–UDP (green) and RNase A pdUppA-3′-p (yellow).
