Movie S2.

Symmetrization facilitates maturation into adult medusae. The medusae were filmed 4 wk after amputation. The movies are in real time. Part 1: Medusa growing from symmetrized pentamer. Part 2: An abnormal medusa from ephyrae that do not symmetrize. The movie can also be viewed through the following YouTube link: www.youtube.com/watch?v=lQdx-rwvPFM&feature=youtu.be.