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Scattering modeling fits for C3 in three buffers. A, the x-ray and neutron fits for C3 at 0.75–1.2 mg/ml in 137 mm NaCl buffer in light and heavy water are shown in blue and green, respectively. B, x-ray fit for C3 in 50 mm NaCl buffer in light water extrapolated to zero concentration. C, the best fit C3 structure is shown. For more details, see the legend to Fig. 8.
