3AA4: A52v E.Coli Rnase Hi
reference: Protein core adaptability: crystal structures of the cavity-filling variants of Escherichia coli RNase HI., Tanaka M, Chon H, Angkawidjaja C, Koga Y, Takano K, Kanaya S, Protein Pept Lett. 2010 Sep;17(9):1163-9. PMID: 20423323

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