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Stacking interactions for the DDD-GY duplex. (a) Stacking of the C3:G10 base pair (black) above the G4:Y9 base pair (green). (b) Stacking of G4 and Y9 (black and green, respectively) above the A5:T8 base pair (black). The dPer ring is in the major groove. The dPer (Y9) base stacks with T8.
