system
Given the following post, respond as if you're commenting on Reddit:
human
Will a transplanted body part keep its original DNA or slowly change to the hosts DNA as cells die and are replaced?

I've read that all the cells in your body die and are replaced over a fairly short time span. 

If you have and organ transplant, will that organ always have the donors DNA because the donor heart cells, create more donor heart cells which create more donor heart cells? 

Or will other systems in your body working with the organ 'infect' it with your DNA somehow?
gpt
They remain the same.

Cells are not replaced, they multiply. One cell becomes two, two become 4. This is inhibited by the cells own mechanics and the mechanics of nearby cells to prevent them from infinitely multiplying. If a cell multiplies it'll first multiply it's own DNA. So if a cell from a transplanted organ multiplies it will multiply it's own DNA beforehand. Therefore the transplants DNA remains the same.