as a gift to all the disabled veterans (and comic book fans), scientists have found a single gene that when disabled, allows for regen to occur in mice. where normally scar tissue forms, the cells become like embryonic stem cells and heal completely with no scar like salamanders that lose their tail.
there must be some evolutionary reason why this powerful trait was lost in most animals. if the reason is that cancer is more likely to develop, then this treatment might be limited in the future to the severely injured. most ppl wouldn’t want to trade a scar for cancer or other genetic anomaly.
but if it’s due to the high energy costs of rebuilding body parts as an adult, then this could change our way of life. this could be the lazarus pit of our day. no scars, no lost limbs, being able to rebuild organs, grow new skin, etc.