1F6U:
reference: NMR structure of the HIV-1 nucleocapsid protein bound to stem-loop SL2 of the psi-RNA packaging signal. Implications for genome recognition., Amarasinghe GK, De Guzman RN, Turner RB, Chancellor KJ, Wu ZR, Summers MF, J Mol Biol 2000 Aug 11;301(2):491-511. PMID: 10926523

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