We have studied the effect of Mannich base acetate (MBA), an antioxidant, on growth of the yeast, as well as on the level of cAMP and Ca2+ uptake by them. We demonstrate that the antioxidant induced an increase in the level of cAMP in yeast cells and a decrease in Ca2+ uptake by the cells. The effect of the antioxidant depends on the level of Ca2+ in the growth medium.
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