1M08:
reference: The crystal structure of the nuclease domain of colicin E7 suggests a mechanism for binding to double-stranded DNA by the H-N-H endonucleases., Cheng YS, Hsia KC, Doudeva LG, Chak KF, Yuan HS, J Mol Biol 2002 Nov 22;324(2):227-36. PMID: 12441102

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