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Morelli, Saul Ares, Patterning embryos with oscillations: structure, function and dynamics of the vertebrate segmentation clock, Development, 2012","review_link":"https://doi.org/10.1242/dev.063735","review_verified":"true","summary":"Embryos build their backbone segment by segment, timed by a genetic clock in each cell that ticks about half as fast in human cells as in mouse cells, daily clocks keep a 24-hour period whether warm or cold, and bacteria time their division so that cells stay the same size. 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