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. 2004 Feb 11;32(3):1097–1102. doi: 10.1093/nar/gkh269

Figure 1.

Figure 1

Quadruplex columns in d(TGGGGT) crystals; left, the S1 structure in space group P1; right, the S2 structure in space group P21. Each quadruplex type is shown in a different color. A thymine tetrad is shown in black, with atoms as small spheres. It belongs to the red quadruplex. Ions are shown as yellow (Tl+) and pink (Na+) balls. Parallel columns are packed on the plane of the paper and form layers, which are stabilized by thymine interactions between neighbor columns. Layers parallel to the plane of the paper show no apparent contacts among themselves.