1X9V:
reference: The C-terminal domain of the HIV-1 regulatory protein Vpr adopts an antiparallel dimeric structure in solution via its leucine-zipper-like domain., Bourbigot S, Beltz H, Denis J, Morellet N, Roques BP, Mely Y, Bouaziz S, Biochem J 2005 Apr 15;387(Pt 2):333-41. PMID: 15571493

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