K2N (Knotted To Nested) a service to get from knotted to nested RNA structures. This site provides access to a variety of methods for pseudoknot removal.
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Sandra Smit, Kristian Rother, Jaap Heringa, and Rob Knight.
From knotted to nested RNA structures: a variety of computational methods for pseudoknot removal.
RNA (2008) 14(3):410-416.