Figure 6.

Direct observation of active transport of endocytosed Tat quantum dots (Tat-QDs) inside living cells. (a,b) Directed motion from the cell periphery to an intracellular region adjacent to the cell nucleus. The boxed red area in panel a is magnified in panel b. The white line represents the trajectory of the Tat-QD vesicle indicated by the red arrow. The green line shows the plasma membrane boundary of the cell. (c,d) Directed motion along cell-peripheral tracks. The boxed red area of panel c is magnified in panel d. The green line indicates the plasma membrane of the cell. Reproduced with permission from Reference 67.