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Mitochondrial outer membrane permeabilization, which is a critical step in apoptosis, is initiated upon transmembrane insertion of the C‐terminal α‐helix (α9) of the proapoptotic Bcl‐2 family protein BAX. The isolated α9 fragment (residues 173–192) is also competent to disrupt model membranes, and the structures of its membrane‐associated oligomers are of interest in understanding the potential roles...