4NYZ:
reference: The crystal structure of a Cardiovirus RNA-dependent RNA polymerase reveals an unusual conformation of the polymerase active site., Vives-Adrian L, Lujan C, Oliva B, van der Linden L, Selisko B, Coutard B, Canard B, van Kuppeveld FJ, Ferrer-Orta C, Verdaguer N, J Virol. 2014 Mar 5. PMID: 24600002

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