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Selank is a synthetic heptapeptide, built from the natural immune-signaling peptide tuftsin with a short three-amino-acid tail added on. It is best known in research for its role in studies of neurotransmitter signaling, stress adaptation, and immune modulation.
It comes from work at the Russian Academy of Sciences and has a growing research base, with studies exploring how its tuftsin-based design shapes brain and immune signaling pathways.