3KD5:
reference: Phosphonoformic acid inhibits viral replication by trapping the closed form of the DNA polymerase., Zahn KE, Tchesnokov EP, Gotte M, Doublie S, J Biol Chem. 2011 Jul 15;286(28):25246-55. doi: 10.1074/jbc.M111.248864. Epub, 2011 May 12. PMID: 21566148

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