EXPERIMENTAL SETUP. “Experimental evolution of multicellularity. We subjected the unicellular yeast Saccharomyces cerevisiae to an environment in which we expected multicellularity to be adaptive. We observed the rapid evolution of clustering genotypes that display a novel multicellular life history characterized by reproduction via multicellular propagules, a juvenile phase, and determinate growth.”
http://www.pnas.org/content/109/5/1595.full