Finally, it is interesting that symmetrization has evolved in organisms that also regenerate. Aurelia polyps are known to be capable of regenerating, as are the polyps of many other cnidar- ians. Did symmetrization evolve in parallel with regeneration, or is this a potentially competing mechanism? How common is it for an organism to have the ability to regenerate in one developmental life stage, and yet reorganize, rather than regenerate, at a differ- ent stage? How is the switch between these alternative self-repair mechanisms regulated? Further, might it be possible to induce a switch between these two strategies of self-repair? Understanding the evolutionary relationship between the fundamentals of sym- metrization and regeneration might give insights into the adaptive pressures that govern self-repair strategies in animals.