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Background: Protein phosphatase type 2A (PP2A) is a protein serine/threonine phosphatase that controls fundamental cellular processes, including transcription, translation, metabolism, cell growth, apoptosis, and varied other signal transduction pathways (1-3). PP2A is comprised of a core enzyme, which is made up of catalytic C and regulatory A (PR65) subunits, and a secondary regulatory B subunit. This B subunit contains four different protein families. In response to EGF or insulin, it has been shown that Src phosphorylates PP2A at Tyr307, thereby inactivating PP2A (4).