1XWL:
reference: Crystal structure of a thermostable Bacillus DNA polymerase I large fragment at 2.1 A resolution., Kiefer JR, Mao C, Hansen CJ, Basehore SL, Hogrefe HH, Braman JC, Beese LS, Structure 1997 Jan 15;5(1):95-108. PMID: 9016716

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