Before revision: The evolution of animals involved a transition from a unicellular transcriptional regime to a transcriptional program supporting developmentally programmed somatic multicellularity. This transition was facilitated by an emergent gene repertoire devoted to developmental regulation, which involved gene family expansion and diversification as well as gene innovation.
After revision: The evolution of animals involved acquisition of an emergent gene repertoire devoted to developmental regulation, which involved gene family expansion and diversification as well as gene innovation.