Follow this link to a downoladable spreadsheet to allow you to take a substring of any RNA sequence. (Download is under the “File” Menu…)
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Bumping this post in case anyone needs to isolate part of a long sequence for Pseudoknot Detective. If a player is looking at a large structure in RNACentral, for example, and spots a possible pseudoknot, the sequence can be copied into this spreadsheet and snipped at desired base positions.