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The heptamer of ?-hemolysin from Staphylococcus aureus has a mushroom-like shape and measures up to 100 Å in diameter and 100 Å in height. A membrane-spanning, solvent-accessible channel runs along the sevenfold axis and ranges from 14 Å to 46 Å in diameter. On the exterior of the 14-strand antiparallel ? barrel there is a hydrophobic belt approximately 30 Å in width that provides a surface complementary to the nonpolar portion of the lipid bilayer. The interfaces

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