In real life, scientists have been working toward tissue regeneration for years, and a recent report says that scientists "may be one step closer to regenerating tissue like salamanders or newts do." Via the Ivanhoe Newswire, we learn that scientists at the Stanford University School of Medicine have been investigating "run-of-the-mill muscle cells" to see whether they can be induced to re-enter the cell cycle and "begin proliferating." They've had some limited success with the muscle tissue in mice, and want to see if the new techniques work with other cell types.
Here's hoping the scientists find success with their research and will use it to the greater good of mankind. As opposed to, say, doing what Tommy Lee Jones does to that weapons dealer in Men in Black: blow his head off because it will grow right back.