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I've often wondered if human hair is some how a slightly different organism. But I guess it has the same DNA as the spit from our mouth so I guess not.

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Human hair, no. But the mixed-up hairs of this paradoxical being, very much so:

https://www.taxonomyaustralia.org.au/post/what-on-earth-is-m...

Hair, as in the main shaft outside of the follicle, is mostly keratin and doesn't contain any DNA at all.

It does contain DNA.

https://nij.ojp.gov/funding/awards/15pnij-23-gg-04209-dnax

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