Fig. 4. Microtubules. (A) Control or NPC fibroblasts were labeled with the indicated antibodies. (B and C) HeLa cells transfected with CD63–GFP were treated for 13 h with U18666A, and the drug remained present throughout the experiment. Cells were then treated for 1 h with nocodazole (B; U18 + Noc) and then re-incubated for 90 min without nocodazole (C; U18 + Post-Noc). Motility analysis was as in Figure 1. Bars: (A) 8 µm; (B and C) 4 µm.