Have you heard of the immortal jellyfish? The Turritopsis nutricula jellyfish is an amazing creature! It has the remarkable ability to regenerate its cells in times of crisis and grow again, thus making some scientists say it is immortal! How does it do it? Well, if the jellyfish finds itself under extreme stress, for example is starving or injured, it attaches itself to something in an area where the ocean water is warm and transforms itself in to a blob (bunch of cells, not unlike the embryo phase of a human fetus) and from there, the “embryo” starts the differentiation stage (again!) where the cells transform in to all the elements needed to from a new jellyfish, literally re-growing and being reborn again!
But since all the jellyfish’s cells already had a purpose in the body the differentiation stage is actually called Transdifferentiation stage where adult, mature cells, transform into a different kinds of cells. Scientists are studying the immortal jellyfish very closely, hoping of applying what they learn from them to issues such as human aging and illness.