The Wikipedia article on prions and other sources seem to only talk about variants of PrP protein.

I think I remember a previous version of Wikipedia saying something about another protein able to form a prion.

I know there are prion-like proteins, but for this question, I want proteins that are able to form true prions. It does not matter if the protein does not form prions in humans specifically, but does in other organisms.

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    – tyersome
    Oct 23 '21 at 19:49
  • 1
    $\begingroup$ @tyersome I tried searching, but it just ends up with a bunch of information of PrP, because there does not seem to be much interest in the others or how many there are. $\endgroup$ Oct 23 '21 at 20:42
  • $\begingroup$ No time to write a real answer but for the diversity see ncbi.nlm.nih.gov/pmc/articles/PMC5131755 The 2nd prion thing you might have heard of may have to do with Alzheimer's ucsf.edu/news/2019/05/414326/… I think it's still controversial. $\endgroup$
    – Fizz
    Oct 23 '21 at 23:29
  • $\begingroup$ @Fizz I think it was Doppel protein which I remember, which is called Prion protein 2. It is similar and takes a bigger role in PrP null mice. No idea why researchers didn't try knocking it out too. en.wikipedia.org/wiki/PRND $\endgroup$ Oct 26 '21 at 13:45

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