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Catalytic domains of the metalloenzymes protein phosphatases (PPP) 1, 2A and 2B (PP1, PP2A and PP2B, respectively) are homologous to ∼45%, with the residues in the enzymatic centers strictly conserved. PP1, PP2A and PP2B are abundant in cells and they dephosphorylate serine and/or threonine residues in a variety of proteins serving as cellular phospho switches. The active enzymes work as invariant...
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