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Figure 2.
Figure 2. The Cross-Strand Purine Stack(A) A cross-strand A
stack showing A104 from one strand in blue stacked on A73 of the
other strand in yellow. The position of the kink at the β and
γ angles of the yellow backbone is indicated.(B) Nucleotide
sequences of the six observed cross-strand A stacks ([42, 32, 39
and 11]) and the consensus for bulged and nonbulged A stacks.
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