**Fig. 2.** Predicted kinetics of oxidation of P+ and cyt c on illumination of a population of supercoplexes in the presence of myxothiazol or stigmatellin. Cytochrome c oxidation shows a rapid onset (more so when stigmatellin is present), and the oxidation of P lags. Because of the statistic inhomogeneity, some P becomes oxidized earlier than expected from the calculated equilibrium constant. The "magic square" plot of fraction of P reduced v. fraction of c reduced shows the apparent equilibrium constants, which are similar. The solid lines show theoretic curves for homogeneous equilibrium constants of 10 and 100.