Time course experiments. 1 μM iAs was introduced into a reaction mixture containing 0 mM GSH (upper panels) or 1 mM GSH (lower panels). The red and green dots are data points taken from ; the curves are the result of model computations. The experimental measurements did not distinguish between arsenicals and arsenicals bound to GSH, so, likewise, the model curves represent the named arsenicals plus their GSH conjugates. For more detail, see the text.