Current research suggests that more complex life-forms, including humans, evolved from a symbiosis event of Bacteria and another single-celled organism known as Archaea. However, evidence of a transition period in which the two organisms mixed where nowhere to be found. That is, until now. In the deep waters of the Black Sea, scientists found microbes that can make membrane lipids, a layer that surrounds a cell like a skin, of unexpected origin. Researchers from NIOZ and Utrecht University have published their findings in the prestigious ISME Journal.
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Source: Phys.org