3TCJ:
reference: Purification and crystallization of Vibrio fischeri CcdB and its complexes with fragments of gyrase and CcdA., De Jonge N, Buts L, Vangelooven J, Mine N, Van Melderen L, Wyns L, Loris R, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2007 Apr 1;63(Pt, 4):356-60. Epub 2007 Mar 30. PMID: 17401216

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