3RR5:
reference: ATP-dependent DNA ligase from Thermococcus sp. 1519 displays a new arrangement of the OB-fold domain., Petrova T, Bezsudnova EY, Boyko KM, Mardanov AV, Polyakov KM, Volkov VV, Kozin M, Ravin NV, Shabalin IG, Skryabin KG, Stekhanova TN, Kovalchuk MV, Popov VO, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Dec 1;68(Pt 12):1440-7., doi: 10.1107/S1744309112043394. Epub 2012 Nov 14. PMID: 23192021

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