Figure 10.

Confocal images of HeLa cells incubated with the FCD sensor (FCD, 50 µg mL⁻¹) and 100 µM of Cu²⁺ (A,D), and then treated with 75 µM (B,E) and 150 µM of S²⁻ (C,F). The overlay images confirm the signals are from in-cell FCDs, not interference.