1XO1:
reference: Mutagenesis of conserved lysine residues in bacteriophage T5 5'-3' exonuclease suggests separate mechanisms of endo-and exonucleolytic cleavage., Garforth SJ, Ceska TA, Suck D, Sayers JR, Proc Natl Acad Sci U S A 1999 Jan 5;96(1):38-43. PMID: 9874768

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