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The G·A pairs of the K-turn.
A. Parallel-eye stereographic image of the two G·A pairs of the box C/D K-turn [14], chosen as an example of an N3-type standard K-turn.
B. Both G·A pairs are trans G(sugar edge)·A(Hoogsteen edge) pairs bonded by hydrogen bonds from GN2 to AN7 and AN6 to GN3.
