MSD profiles in cortex. Data collected using 60 (purple), 100 (blue), 200 (teal), and 1000 nm (lime) (a) PS-COOH and (b) PS-PEG NPs in the cortex region of 300μm-thick brain slices from P14 Sprague-Dawley rats. Data represent the precision-weighted geometric MSD averages over number of videos per slice (n=5) and number of slices per condition (n=3). Error bars at τ=0.1, 0.5, and 1 s represent 95% CIs. MSD values of 100 nm PSCOOH NPs (grey) in agarose gel is provided as a reference in all plots. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)