Figure 2

An example of the encoding of an RNA secondary structure into a Secondary Structure Descriptor (SSD). (a) RNA secondary structure representation with the two highlighted Non-Branching Structures (NBSs) (red one and blue one); (b) the extraction of the two NBSs; (c) mapping of the secondary structure in the dot-bracket notation (i.e., a 3-letter alphabet where dots represent unpaired bases, open-closed brackets "()" represent the paired bases) and the visualization of the two RSSPs that are a pair of the sub-sequence and the corresponding NBS; (d) the SSD composed of the two RSSPs.