Primitive Asgard Cells Show Life on the Brink of Complexity

An oak tree. The symbiotic fungus intertwined with its roots. A cardinal chirping from one of its branches. Our best clue yet to their shared ancestor might have arrived in electron microscope images that were unveiled in December. “Look!” said the microbiologist Christa Schleper, beaming as she held a printed, high-resolution image in front of her webcam at the University of Vienna.

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