Figure 2.

Overview of the d(CGA)-based parallel-stranded homoduplexes. The PyMOL graphics software was used for all figures (DeLano, 2002 ▸). (a) The asymmetric unit for GA(CGA)₅. The individual chains within each duplex (1–3) are labeled and colored accordingly. Duplex 1: chain A, cyan; chain B, blue. Duplex 2: chain C, green; chain D, yellow. Duplex 3: chain E, magenta; chain F, light pink. (b) 3′ to 5′ end stacking of duplex 1 and 2. The 3′ A17–A17 base pair of duplex 1 forms stacking interactions with the 5′ G1–G1 base pair of duplex 2 to form three tandem G/A stacking interactions. (c) The (CGA)₅TGA asymmetric unit. Each chain within duplex 4 is labeled and colored accordingly: chain A (salmon), chain B (gray).