Figure 6.

Mean square displacement (MSD) of single HA molecules at different pH values. The data has been fit using the exponential function $MSD\propto t^{\beta }$ such that when $\beta =1$, normal diffusion is represented; when $\beta <1$, subdiffusion is represented; and when $\beta >1$, superdiffusion is represented. Individual exponents are presented in Table 2. The legend indicates pH values.