Geneticists have revealed the secret of the "immortal" jellyfish.

It may help people fight aging. Spanish scientists have deciphered the genome of the "immortal" jellyfish - Turritopsis dohrnii. She is able to reverse the aging process, repeatedly returning to the larval stage. Mutations have been found in the T. dohrnii genome that allow it to do this. They are responsible for regenerating DNA and preventing the destruction of telomeres, the protective caps at the ends of chromosomes that shorten with age in humans.