I am looking for other answers, but I was wondering if it removes skin cells on the way out.
Answer:
Yes, it is very possible to get DNA samples from feces. When we defecate, cells are slothed off along with our feces. Therefore, our skin cells can be extracted easily. Yes, you will have other DNA mixed in, but simple testing will be able to exclude the other cells.By looking under a microscope, and running some procedures you can separate the skin cells from the other cells. Then you would lyse these cells, treat with endonucleases and then you can run them on a gel.It's a little more complicated than getting normal skin cells but it is possible.Good luck!
I would think it wouldn't be desirable, because you would have the potential for DNA from the food you eat to be mixed in with your own DNA. I'm not sure how you would be able to separate one from the other.
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