6GHS:
reference: Crystal structure of the modification-dependent SRA-HNH endonuclease TagI., Kisiala M, Copelas A, Czapinska H, Xu SY, Bochtler M, Nucleic Acids Res. 2018 Sep 7. pii: 5091957. doi: 10.1093/nar/gky781. PMID: 30202937

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