2RN2:
reference: Structural details of ribonuclease H from Escherichia coli as refined to an atomic resolution., Katayanagi K, Miyagawa M, Matsushima M, Ishikawa M, Kanaya S, Nakamura H, Ikehara M, Matsuzaki T, Morikawa K, J Mol Biol 1992 Feb 20;223(4):1029-52. PMID: 1311386

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