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Genetic hints reveal the roots of the tree of life before the last universal common ancestor

Duplicated genes that appear in every branch of the tree of life can provide us with insight into the evolution that occurred ...
Phys.org

Looking back 3.8 billion years into the root of the 'Tree of Life'

The ribosome grew by accretion of new RNA onto old RNA in a process reminiscent of nested Russian dolls. The most ancient part of the ribosome contains small RNA fragments and is represented by the ...