3QN2:
reference: Structure-based design of a disulfide-linked oligomeric form of the simian virus 40 (SV40) large T antigen DNA-binding domain., Meinke G, Phelan P, Fradet-Turcotte A, Archambault J, Bullock PA, Acta Crystallogr D Biol Crystallogr. 2011 Jun;67(Pt 6):560-7. Epub 2011 May 17. PMID: 21636896

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