1T4L:
reference: Structural basis for recognition of the AGNN tetraloop RNA fold by the double-stranded RNA-binding domain of Rnt1p RNase III., Wu H, Henras A, Chanfreau G, Feigon J, Proc Natl Acad Sci U S A 2004 Jun 1;101(22):8307-12. Epub 2004 May 18. PMID: 15150409

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