The axolotl, a smiling Mexican amphibian, is the largest genome ever sequenced. It has 32 billion base pairs, ten times the size of human genome. The axolotl has been bred and studied in laboratories for over 150 years and is endangered in the wild. The axolotl is an extremely interesting organism: it regenerates damaged organs, regrows amputated limbs with all bones, muscles, and nerves, and even heals wounds without scar tissue. The amazing thing about its ability to heal and regrow is that it will do so with the new organs or limbs functioning just like they did before. For example, a crushed spinal cord can function again normally like it was never crushed. This animal was the first salamander genome to ever be sequenced. It took so long to be done because it has many repetitive parts in its genome. This genome sequencing is just the beginning of their studies, but a huge advance in science because it has the potential to answer many questions. The genes involved in regeneration are being identified and studied.
original scientific study: