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[Glossary](/glossary)/ Tuftsin 

Research 

# Tuftsin

## Definition

A tetrapeptide naturally produced by the spleen that stimulates immune cell activity.

## Why It Matters

Selank is a synthetic analog of tuftsin, making this peptide relevant to understanding Selank's mechanism.

## Related Terms

[Analog](/glossary/analog)[Immune Response](/glossary/immune-response)

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