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Hydrophobicity density ρ(d) as a function of distance d from the protein interior of the four transmembrane bundles of, 1C3W, 1C17, 1MSL, and 1K4d, and of the soluble proteins 1AKZ and 3PBG. The solid lines are the results of calculations for shells of 1 Å thickness. The dashed lines are for shells of 2 Å thickness.
