These jellies can take differentiated cells backward and forward through time. Now scientists are studying them to see how they can “un-age”
Check out Maria Pia Miglietta’s research on life cycle evolution at Pennsylvania State University, and read her primary research article in Biological Invasions:
Miglietta M.P., Lessios H. (2009) A Silent Invasion. Biological Invasions 11 (4): 825-834.