1NBK:
reference: Structural basis of the highly efficient trapping of the HIV Tat protein by an RNA aptamer., Matsugami A, Kobayashi S, Ouhashi K, Uesugi S, Yamamoto R, Taira K, Nishikawa S, Kumar PK, Katahira M, Structure (Camb) 2003 May;11(5):533-45. PMID: 12737819

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