Now, the biologist William Ratcliff at the Georgia Institute of Technology and his colleagues report that over the course of nearly two years of evolution, they have induced unicellular yeasts to grow into multicellular clusters of immense size, going from microscopic to branching structures visible to the naked eye. The findings illustrate how such a transition can happen, and they imply intriguing future experiments to see whether these structures develop differentiation — whether cells start to play specialized roles in the drama of life lived together.
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