Size of QDs affects their uptake by microglia. A. Internalization of QDs of different sizes by microglia. Blue: DAPI. B. Size-dependent internalization of QDs by microglia was quantified by fluorescence intensity with Metamorph analyses. n = 23-39 cells from 5-6 independent images. ***, P < 0.001 by Tukey-Kramer posthoc test. Bars represent mean ± SEM. Scale bar, 20 μm.