3IFU:
reference: Crystal structure of porcine reproductive and respiratory syndrome virus leader protease Nsp1alpha., Sun Y, Xue F, Guo Y, Ma M, Hao N, Zhang XC, Lou Z, Li X, Rao Z, J Virol. 2009 Nov;83(21):10931-40. Epub 2009 Aug 12. PMID: 19706710

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