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The adsorption of BSA (a), FITC-BSA (b), and all cations from HBSS (c) on three samples. White scale bar = 200 μm. Together with the size distributions of BSA in different solutions from DLS measurements (d), the concentrations of Na+, Ca2+ are equal to their contents in HBSS. **p < 0.01, ***p < 0.001 (VS TNT, PMSTF).
