2FQZ:
reference: Nucleotide flips determine the specificity of the Ecl18kI restriction endonuclease., Bochtler M, Szczepanowski RH, Tamulaitis G, Grazulis S, Czapinska H, Manakova E, Siksnys V, EMBO J. 2006 May 17;25(10):2219-29. Epub 2006 Apr 20. PMID: 16628220

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