2DTU:
reference: Structural and biochemical investigation of the role in proofreading of a beta hairpin loop found in the exonuclease domain of a replicative DNA polymerase of the B family., Hogg M, Aller P, Konigsberg W, Wallace SS, Doublie S, J Biol Chem. 2006 Nov 9;. PMID: 17098747

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