2IJF:
reference: Crystal structure of poliovirus 3CD: virally-encoded protease and precursor to the RNA-dependent RNA polymerase., Marcotte LL, Wass AB, Gohara DW, Pathak HB, Arnold JJ, Filman DJ, Cameron CE, Hogle JM, J Virol. 2007 Jan 24;. PMID: 17251299

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