3HW6:
reference: Nucleoside monophosphate complex structures of the endonuclease domain from the influenza virus polymerase PA subunit reveal the substrate binding site inside the catalytic center., Zhao C, Lou Z, Guo Y, Ma M, Chen Y, Liang S, Zhang L, Chen S, Li X, Liu Y, Bartlam M, Rao Z, J Virol. 2009 Sep;83(18):9024-30. Epub 2009 Jul 8. PMID: 19587036

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