This paper uses microfluidics and Xenopus extracts to investigate the effects of mitotic feedbacks on the cell cycle period. It is shown that the inhibition of G2 regulatory positive feedback loops does not reduce the tunability of the cell cycle oscillations, while interference with PP2A phosphatase can completely block of the cell cycle. The experiments are well-conducted and the results should be of interest to researchers interested in the cell cycle, specifically in the regulation of mitosis.
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