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Comparison of the structures of the pore-forming domains of colicins A, N, B, Ia, and E1. Each molecule is shown in two orientations: one approximately parallel to the hydrophobic hairpin (upper) and the other perpendicular to it (lower). The hydrophobic helices are red, whereas the other eight helices are blue. Helix numbers are shown explicitly for colicin A. The overall similarity in the folds of these molecules is apparent.
