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Analytical ultracentrifugation profile of ICP27-CTD. The sedimentation equilibrium analysis of ICP27-CTD is shown with experimental data in the top graph and the residuals of fit in the lower graph. The data were collected for three different concentrations of protein (0.8, 0.5, and 0.3 absorbance units) at 10,500, 12,700, and 15,500 rpm. The data are fit to a monomer-dimer model, showing that ICP27-CTD is capable of forming self-associating dimers even at low concentrations.
