Comment by Terr_

Tangentially: There's interesting research out there indicating that cellular repair is guided and promoted by the local electrical fields from surrounding tissues.

For example: "Treating Scars After Burns With Pulsed Electric Fields in the Rat Model" - https://academic.oup.com/jbcr/article-abstract/45/6/1553/772...

I wonder if we (or at least, our descendants) will figure out limb regrowth before we figure out functional immortality.