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The cross-eye stereo pictures into the major groove of the interdigitated zipper-like d(GGA)2 (top), d(GGGA)2 (middle) and 5′-d(GTA)/(AAG)-5′ (bottom) motifs in space-filling. One strand is colored in blue, while another in gray to clearly illustrate the cross-strand stacking feature. In the 5′-d(GTA)/(AAG)-5′ (bottom) motif, the 6N atom of the intercalated adenine is colored in light blue and the methyl carbon of the intercalated thymine in deep blue.
