Are there any natural proteins or cells (or anything) made by the human body with spikes like those of Covid-19?

I know that there have been no serious side effects reported from the Covid-19 vaccine, but I am wondering what theoretical interference might occur if the immune system started attacking any similarly-spiked thing that it found.

  • The immune system doesn't recognize foreign invaders based on their outward shape; it recognizes them based on the presence of a specific protein.
    – Carey Gregory
    Apr 3, 2021 at 0:03
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    @CareyGregory Ok, let me broaden the question then to "Are there any natural proteins made by the human body which are similar to the Covid-19 spike protein?"
    – bobuhito
    Apr 3, 2021 at 1:40
  • Sure, by all means edit your question to be more along those lines. I think that will make it a better question. And if it doesn't get answered here, you might try Biology.SE because the answer will depend on the fine points of how the immune system recognizes proteins and just how "similar" they have to be. But don't cross-post. Just try one site at a time.
    – Carey Gregory
    Apr 3, 2021 at 4:32


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