NoFold is an approach for characterizing and clustering RNA secondary structures without computational folding or alignment. It works by mapping each RNA sequence of interest to a structural feature space, where each coordinate within the space corresponds to the probabilistic similarity of the sequence to an empirically defined structure model (e.g. Rfam family covariance models).
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Middleton SA, Kim J.
NoFold: RNA structure clustering without folding or alignment.
RNA. 2014 Nov;20(11):1671-83. doi: 10.1261/rna.041913.113. Epub 2014 Sep 18. PMID: 25234928; PMCID: PMC4201820.