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Genetics re-establish the utility of 2-methylhopanes as cyanobacterial biomarkers before 750 million years ago - Nature Ecology & Evolution
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Fossilized lipids offer a rare glimpse into ancient ecosystems. 2-Methylhopanes in sedimentary rocks were once used to infer the importance of cyanobacteria as primary producers throughout geological history. However, the discovery of hopanoid C-2 methyltransferase (HpnP) in Alphaproteobacteria led to the downfall of this molecular proxy.
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