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(a) Protein association rate (ka) as a function of protein concentration for gp2.5 in 5 mM salt (red diamond), 25 mM salt (green triangle) and 50 mM salt (blue circle). (b) Protein association rate (ka) as a function of protein concentration for gp2.5-Δ26C in 25 mM salt (green triangle), 50 mM salt (blue circle) and 100 mM salt (brown square). Lines are fit to the data using Equation (5). Dashed lines show the three-dimensional (3D) diffusion limit as discussed in the text (48).
