Scientists have decoded the atomic structure of Photosystem I from a 3-billion-year-old cyanobacteria lineage, offering a unique look at early oxygen-producing photosynthesis. The ancient nanodevice, purified from Anthocerotibacter panamensis, shows a remarkably conserved three-leaf-clover architecture for light absorption despite billions of years of evolution. The findings suggest that the fundamental design for harnessing sunlight was established very early in the history of life on Earth, predating the evolution of more complex photosynthetic machinery.
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