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Superimposition of the TteSAM-I and env87SAM-I/IV aptamer domains. (A) The TteSAM-I riboswitch structure (Protein Data Bank accession code 2GIS) is shown in orange, and the env87SAM-I/IV structure in blue. The conserved core between the two RNAs is emphasized in green. This core represents the bases used to align the structures. (B) 180° clockwise rotation of the aligned structures.
