1KOD: Rna Aptamer Complexed With Citrulline, Nmr
reference: Structural basis of ligand discrimination by two related RNA aptamers resolved by NMR spectroscopy., Yang Y, Kochoyan M, Burgstaller P, Westhof E, Famulok M, Science 1996 May 31;272(5266):1343-7. PMID: 8650546

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