Re: What exactly is Regeneration like to the Doctor?
"Every cell in my body is dying"
Sounds like he just burns off all of the past doctor's physical appearance and his body structure is reorganized
The brain and two hearts are probably all that remains unchanged.
Even the brain is different, as he has different personalities. Memory and racial traits are likely all that stays.
If you're one of the meatheads constantly droning on about "take my country back"... GET OVER IT. The confederacy LOST.