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Protein phosphatase 2A (PP2A), a heterotrimeric serine/threonine-specific protein phosphatase, comprises a catalytic subunit and two distinct regulatory subunits, A and B. The primary sequence of the catalytic (C) subunit is highly conserved in evolution, and its function has been shown to be essential in yeast, Drosophila and mice. In many eukaryotes, the C subunit is encoded by at least two nearly...