This model is from the article:
Downregulation of PP2A(Cdc55) phosphatase by separase initiates mitotic exit in budding yeast.
Queralt E, Lehane C, Novak B, Uhlmann F. Cell.
2006 May 19;125(4):719-32. 16713564
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Protein phosphatase 2A (PP2A) is a family of conserved serine/threonine phosphatases involved in several essential aspects of cell growth and proliferation. PP2ACdc55 phosphatase has been extensively related to cell cycle events in budding yeast, however few PP2ACdc55 substrates have been identified...
