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Uptake of [3H]cAMP by natural freshwater bacterioplankton in water samples from 22 April 2002. (A) Time course of [3H]cAMP uptake. (B) Inhibition of [3H]cAMP uptake by different concentrations of unlabeled cAMP. The curve fit was calculated with a Km for cAMP uptake of 1 nM, as described in the text.
