From Wound Healing to Regeneration
uni-heidelberg.de
uni-heidelberg.de
He has some astonishing vids up on YouTube.
-- https://as.tufts.edu/biology/levin-lab/resources/software
Immature humans can regenerate fingers severed back to the first joint if not stitched up, producing a complete fingernail and (different!) fingerprint.
It should be entirely possible to change the way our bodies work to re-enable this regeneration, though it would probably come at some cost. However, since we're no longer primitive cave dwellers without modern medical care, who had to constantly worry about infection killing them, that cost can probably be easily mitigated.