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Inhibitor-2 (I2) ranks amongst the most ancient regulators of protein phosphatase-1 (PP1). It is a small, intrinsically disordered protein that was originally discovered as a potent inhibitor of PP1. However, later investigations also characterized I2 as an activator of PP1 as well as a chaperone for PP1 folding. Numerous studies disclosed the importance of I2 for diverse cellular processes but did not describe a unifying molecular principle of PP1 regulation. We have re-analyzed the literature on I2 in the light of current insights of
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