4WYW:
reference: Multifunctionality of a picornavirus polymerase domain: nuclear localization signal and nucleotide recognition., Ferrer-Orta C, de la Higuera I, Caridi F, Sanchez-Aparicio MT, Moreno E, Perales C, Singh K, Sarafianos SG, Sobrino F, Domingo E, Verdaguer N, J Virol. 2015 Apr 22. pii: JVI.03283-14. PMID: 25903341

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