Exposure to atmospheric oxygen in the days after a mammal's birth causes its heart muscle cells to stop proliferating. The finding may explain why zebrafish, which live in a hypoxic environment, can regenerate their hearts as adults.
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Yutzey, K. Switched at birth. Nature 509, 572–573 (2014). https://doi.org/10.1038/509572a
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DOI: https://doi.org/10.1038/509572a