ANIMALS - How Octopus Arms Regenerate With Ease

Like a starfish, an octopus can regrow lost arms. Unlike a starfish, a severed octopus arm does not regrow another octopus. But the biological secrets inside their arm regeneration feat do hold the promise of learning more about how we might better regenerate our own diseased or lost tissue. If not whole limbs, at least perhaps fresh nerves or organ segments.
http://blogs.scientificamerican.com/octopus-chronicles/2013/08/28/how-