Table 2.

Example of a triple superfamily

The cWW base triple superfamily comprises all geometric base triple families having two bases paired cWW and comprises the most instances. Instances are known for each triple family in the cWW superfamily. The cWW triple families are numbered as in column 1 in Table 1. The alternative names for each triple family are given in columns 2 and 3, and depend on the order in which the nucleotides in the triple are listed. The local strand orientations, parallel (P) or anti-parallel (A) are given in columns 4 through 6. Leontis/Westhof symbols are shown for representing the component base pairs of the triple in columns 7 and 8. In these symbols, circles denote Watson–Crick (W) edges, squares Hoogsteen (H) edges and triangles, Sugar (S) edges, while solid symbols indicate cis base pairs, and open symbols trans base pairs. Finally, column 9 provides schematic representations of each triple family using triangles to represent the bases. Base edges (W, H, S) are labeled with the corresponding symbols (small circles, squares and triangles).