20211219 : regrowing
As far as I know, the bits that we (humans) regenerate are hair, nails and skin. They are strictly not regeneration as its just replenishment of dead cells by more dead cells. Some animals regenerate small and simple things like tails, etc. The only animal (known to man), that regenerates and entire limb if severed, is the Salamander. Skin, Bones, muscles, nervous system, etc - the whole works. A lot of research is being done with the salamander (for a very long time) to understand this. It hasn't gone far yet... For something to grow, for the 1st time, every cell knows what to do because of the DNA. Its a sort of biological reference/ Blue print of what to build. Once done, if there has to be a regrowth, the DNA has the reference, but does the brain instruct what to do? When part of the brain is damaged (due to stroke or trauma or something else), what happens? We are not regrowing anything, but the brain has to reconnect neurons in a different path to do the same thing. There is ...