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Protein phosphatase 2A is the major enzyme that dephosphorylates the serine/threonine residues of proteins in the cytoplasm of animal cells. This phosphatase is most strongly inhibited by okadaic acid. Besides okadaic acid, several other toxins and antibiotics have been shown to inhibit protein phosphatase 2A, including microsystin-LR, calyculin-A, tautomycib, nodularin, cantharidine, and fostriecin...
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