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Loop connectivities and base pairing in the d[TTGGG-(TTAGGG)3A] quadruplex in K+ solution. (a) Edgewise T18-T19-A20 loop. (b) Edgewise T12-T13-A14 loop. (c) Double-chain-reversal T6-T7-A8 loop. (d) Reversed Watson-Crick T13•A24 pair. (e) Watson-Crick T1•A20 pair.
