I have also used genetic code to repair my epidermis with a fibrous tissue after injury. It keeps moisture in and pathogens out.

This but a scratch

Genetic code enables me to understand that reference.

Future humans will be part human, part lizard, part zebra fish, and seveal other species. We will regrow teeth, heart, and limbs. Sometimes we might accidentally grow a tail.

We do already...sometimes. Vestigial tail

To a certain extent. Often times the regenerated "tails" are fatty stubs.