Proteins from ancestral bacteria have been modelled and reconstructed. Strikingly, the heat stability of these proteins parallels the temperatures of their ocean habitats, as determined from the geological record.
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Gouy, M., Chaussidon, M. Ancient bacteria liked it hot. Nature 451, 635–636 (2008). https://doi.org/10.1038/451635a
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DOI: https://doi.org/10.1038/451635a
