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Phospho-B56α is dephosphorylated by PP2A. Endogenous PP2A was immunoprecipitated from HeLa S3 cells and mixed with recombinant B56α phosphorylated by PKR in the presence or absence of 5 nM okadaic acid at 30°C for 20 min. The proteins were separated on an SDS-polyacrylamide gel, and an autoradiograph of the dried gel is shown.
