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Least-squares superpositions of the β-sandwich folds of XepA with the C2 domain of the α-toxin from C. perfringens (PDB entry 2wxt) in orange: (a) the N-terminal XepA domain in blue (r.m.s.d. on Cα atoms of 2.9 Å), (b) the C-terminal XepA domain in red (r.m.s.d. on Cα atoms of 3.0 Å).
