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(a) Schematic representation of the structure of the cIAP2 BIR3 domain. An experimentally achieved dimer constitutes the asymmetric unit. The N-termini bind in the peptide-binding pockets of the BIR domains, forming an extension of the central β-sheet. (b) Schematic representation of the NAIP BIR2-domain structure. The N-terminus, shown in yellow, binds in the peptide-binding pocket similarly as in the cIAP2 BIR3 structure.
