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Model of the dimerized K3 chains obtained from the combination of distance and angular information. After energy minimization, the [1-13C]Ala10-[3-19F]Ala10 and the [1-13C]Ala17-[3-19F]Ala14 interchain distances are 4.5 Å and 10.5 Å, respectively. The REDOR determined distances are 4.5 Å and 10.4 Å. The helices intersect at an approximate cross-angle of 20° (inset).
