2W89:
reference: Crystal structure of the E. coli tRNA(Arg) aminoacyl stem isoacceptor RR-1660 at 2.0 A resolution., Eichert A, Perbandt M, Oberthur D, Schreiber A, Furste JP, Betzel C, Erdmann VA, Forster C, Biochem Biophys Res Commun. 2009 Jul 17;385(1):84-7. Epub 2009 May 6. PMID: 19426710

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