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Sedimentation coefficient distribution analysis of p239 with different salt treatments in 4M urea. The salts and their concentrations are labeled in the panels. The assembly of p239 was activated by incubation with 0.3M (NH4)2SO4, 0.3M Na2SO4, 1.0M NaCl, or 1.0M NH4Cl, indicating the minimum ionic strength required for particle assembly.
