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Epithalon Tetrapeptide studied in immune function, telomerase activity, and pineal regulation. View research notes → Selank Synthetic anxiolytic peptide studied in immune modulation alongside cognitive effects. View research notes → Test Peptide Selank (also called TP-7) is a synthetic heptapeptide derived from tuftsin, a naturally occurring tetrapeptide fragment of immunoglobulin G involved in immune regulation. View research notes → Semax Semax is a synthetic heptapeptide built from the N-terminal fragment of adrenocorticotropic hormone (ACTH), specifically residues 4 through 7, extended with a Pro-Gly-Pro tripeptide to improve metabolic stability. View research notes →