4RZL:
reference: Structure-guided sequence specificity engineering of the modification-dependent restriction endonuclease LpnPI., Sasnauskas G, Zagorskaite E, Kauneckaite K, Tamulaitiene G, Siksnys V, Nucleic Acids Res. 2015 May 22. pii: gkv548. PMID: 26001968

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