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Base triple in bound TAR. (Top) Positions of U23-A27-U38 in the starting structure. (Bottom) The same triple after 270 ps of molecular dynamics simulation. U38-A27 forms a Watson–Crick base pair; U23 is initially far from the pair, but gets closer and co-planar with U38-A27 during the simulation. Hydrogen bonding acceptor–donor distances are reported.
