3CDU:
reference: The crystal structure of coxsackievirus B3 RNA-dependent RNA polymerase in complex with its protein primer VPg confirms the existence of a second VPg binding site on Picornaviridae polymerases., Gruez A, Selisko B, Roberts M, Bricogne G, Bussetta C, Jabafi I, Coutard B, De Palma AM, Neyts J, Canard B, J Virol. 2008 Oct;82(19):9577-90. Epub 2008 Jul 16. PMID: 18632861

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