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Superimposed structures of (A) the 2′,5′-ADP complex in the two RNase A molecules of the asymmetric unit (B) the RNase A–U-2′-p (gray) and the RNase A–U-3′-p complex structures (white), (C) the RNase A–U-3′-p (gray) and the K7A/R10A/K66A RNase A–U-3′-p (PDB entry 4RSK; white) complexes, (D) the RNase U–2′-p (gray) and the RNase A–2′CMP (PDB entry 1ROB; white), and (E) the RNase A–U-3′-p (gray) and the RNase A–3′CMP (PDB entry 1RPF; white) complexes.
