3VJ7:
reference: Identification of the catalytic residues of sequence-specific and histidine-free ribonuclease colicin E5., Inoue-Ito S, Yajima S, Fushinobu S, Nakamura S, Ogawa T, Hidaka M, Masaki H, J Biochem. 2012 Oct;152(4):365-72. Epub 2012 Jul 18. PMID: 22815490

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