
The consensus secondary structure of the A-wedge motif. The nucleotides directly involved in the formation of the wedge arrangement are circled. (N) Any nucleotide. The WC and GU base pairs within each helix are shown by the ellipses. The WC/GU and UG/WC identities correspond to the base pairs at the 0-level. The WC identities correspond to the base pairs at the −1-level. Additional explanations are given in the text.










