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Conformational states of A30 (K2 RNA). (A) “3 + 1” stacking scheme formed by adenines A29, A30, A44, and A33 in the bound RNA, A30 being in a syn/C2′ endo conformation. (B) “2 + 2” stacking scheme formed by adenines A29, A30, A44, and A33 during the trajectories of the unbound RNA, A30 being in a high-anti, anti/C3′ endo conformation.
