Tuftsin

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What Wikipedia says

Tuftsin is a tetrapeptide (Thr-Lys-Pro-Arg, TKPR) located in the Fc-domain of the heavy chain of immunoglobulin G (residues 289-292). It has an immunostimulatory effect. It is named for Tufts University where it was first discovered in 1983.

Excerpt from the Wikipedia article “Tuftsin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Fvasconcellos 15:26, 19 April 2007 (UTC), Public domain, via Wikimedia Commons.