Did you hear about the new technology the US military has developed? They can regrow limbs and organs using a process called nanoscaffolding. How cool is that? It's not so different from how you use stakes to encourage an ivy to grow all over the side of a building. They stick these nanopolymers as a scaffold which are just there as a guide for your own cells to grow. I'm not sure how they encourage the cells to grow but maybe they naturally want to and just lacked the scaffolding until now.
So far only relatively simple things like fingers and bladders have been regrown but who knows what will be possible with version 2.0? And since it was the US military, who knows what is still all secret and classified and for James Bond's eyes only?
We live in a crazy world.