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Two-dimensional gel electrophoresis of proteins labeled with 32Pi in S49 mouse lymphoma cells revealed five phosphoproteins that were rapidly and reversibly dephosphorylated in response to elevation of cyclic AMP (cAMP). Under basal conditions, labeling of at least two of these proteins was limited by slow turnover of protein-bound phosphate. The rapid cAMP-mediated dephosphorylation of these species was attributable, therefore, to stimulation of a specific phosphoprotein phosphatase.
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Kiss et al. (1985) studied this question.
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