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A tweet from Twitterverse: 

The amazing miracle called immune system.

Any evolutionary biologist here who can tell when it appeared in evolution?

RT @SamIAm2021MD@twitter.com

I am blown away by this COVID vaccine video, one of the coolest things I have seen in a long time

馃惁馃敆: twitter.com/SamIAm2021MD/statu

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