New method solves centuries-old animal mystery

Most animal embryos contain three layers of cells that transform into every part of the body—from brains to bones to guts. Since the 19th century, biologists have been puzzling over which of these layers came first in animal evolution. We now have the answer, thanks to a powerful 21st-century technology developed at the Technion-Israel Institute of Technology and deciphering the secrets of evolution may have a side benefit in helping to understand cancer.

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