1IR6:
reference: The crystal structure of exonuclease RecJ bound to Mn2+ ion suggests how its characteristic motifs are involved in exonuclease activity., Yamagata A, Kakuta Y, Masui R, Fukuyama K, Proc Natl Acad Sci U S A 2002 Apr 30;99(9):5908-12. PMID: 11972066

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