Uptake kinetics of HeLa cells incubated at 37°C with gH625-c-prune (A–D), TAT-c-prune (E–H), and c-prune (I–L) for 10 (left panels) and 30 (right panels) minutes. Fluorescence (A, C, E, G, I, and K) and transmitted light (B, D, F, H, J, and L) images. Magnification bar: 20 μm.