Figure 6From: Mathematical modeling of the effects of glutathione on arsenic methylation The effect of the half-life of GSH. The reactions mixture starts with 20 mM GSH and 1 μM iAs. We assume the half-life of GSH in the mixture is 2.5 hours. The rates of the first methylation step, V 1, the second methylation step, V 2, and total methylation vary dramatically throughout an 8 hour period. For explanations, see the text.Back to article page