cloning the dead (discovery)

scientist have frozen mice for 16 years and discovered that they were able to clone pups. they found out that the egg cells and the stem cells do not get damaged at all. scientist think that if they were able to find away to bring the extinct animals back to life like the mammoth, frozen feline, or frozen fish back to life. the experiment that did on the mice was that they would use brain cells to bring them back from the dead and they did but the mouse would go directly to adult hood.