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Szewczak AA, Ortoleva-Donnelly L, Ryder SP, Moncoeur E, Strobel SA. A minor groove RNA triple helix within the catalytic core of a group I intron. Nat. Struct. Biol. December 1998, 5 (12): 1037–42. PMID 9846872. doi:10.1038/4146.
Boudvillain M, de Lencastre A, Pyle AM. A tertiary interaction that links active-site domains to the 5' splice site of a group II intron. Nature. July 2000, 406 (6793): 315–8. PMID 10917534. doi:10.1038/35018589.
Gilbert SD, Rambo RP, Van Tyne D, Batey RT. Structure of the SAM-II riboswitch bound to S-adenosylmethionine. Nat. Struct. Mol. Biol. February 2008, 15 (2): 177–82. PMID 18204466. doi:10.1038/nsmb.1371.