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Correlation among concentration parameters: (A) particle concentration measured by NTA (black circles) vs. protein concentration measured by BCA assay. (B) Protein concentration measured by BCA assay (blue circles), particle concentration measured by NTA (green circles), and z-averaged hydrodynamic diameter (red circles) vs. excess Rayleigh ratio, R ex ; The solid lines show a linear regression to data for BCA vs. R ex (blue line) and NTA vs. R ex (green line).
