This could be scary

Imagine, mice that can replace missing parts.

If they find out what enables them to do that, then they'll be able to translate it into human consumption. No one needs to die anymore. People can regrow damaged organs and limbs. Think about how it will be when you have people in their hundereds (age wize). Population explosion, financial trouble, insurance? I don't want to think of the potential problems that would (in my opinion) outweigh the good.