PMC:1459172 / 6823-7514 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/1459172","sourcedb":"PMC","sourceid":"1459172","source_url":"https://www.ncbi.nlm.nih.gov/pmc/1459172","text":"The \"loops\" of S are planar faces of the unique planar embedding of the secondary structure graph (whose edges are the base pairs in S together with the backbone edges (i, i + 1), i = 1 ..., n - 1). Equivalently, the loops are the elements of the unique minimum cycle basis of the secondary structure graph [34]. The external loop consists of all those nucleotides that are not enclosed by a base pair in S. The standard energy model for RNA secondary structures associates an energy contribution to each loop L that depends on the loop type type(L) (hairpin loop, interior loop, bulge, stacked pair, or multi-branch loop) and the sequence of some or all of the nucleotides in the loop, x|L:","tracks":[]}