Dose-response curves.

Dose-response curves of chelator 108 in the absence (○) and presence (●) of 20 μM (left) or 40 μM (right) deferoxamine. Symbols and bars represent experimental mean values of triplicate samples (± SEM). Sigmoidal fits to the experimental points are shown by solid lines, and the theoretical dose-response curves are shown by dashed lines (dose-additivity) and dotted lines (independent).