Origins of multicellularity: All in the family

One of the most pivotal steps in evolution -- the transition from unicellular to multicellular organisms -- may not have required as much retooling as commonly believed, scientists have found. A comparison of the genomes of the multicellular algae Volvox carteri and its closest unicellular relative Chlamydomonas reinhardtii revealed that multicellular organisms may have been able to build their more complex molecular machinery largely from the same list of parts that was already available to their unicellular ancestors.

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