1F9X:
reference: NMR structure and mutagenesis of the third Bir domain of the inhibitor of apoptosis protein XIAP., Sun C, Cai M, Meadows RP, Xu N, Gunasekera AH, Herrmann J, Wu JC, Fesik SW, J Biol Chem 2000 Oct 27;275(43):33777-81. PMID: 10934209

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