4IBN:
reference: Crystal structure of metagenome-derived LC9-RNase H1 with atypical DEDN active site motif., Nguyen TN, You DJ, Kanaya E, Koga Y, Kanaya S, FEBS Lett. 2013 May 2;587(9):1418-23. doi: 10.1016/j.febslet.2013.03.020. Epub, 2013 Mar 20. PMID: 23523920

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