Selank derived from Tuftsin by adding three amino acids
Selank is a seven amino acid peptide derived from Tuftsin, a naturally occurring four amino acid fragment of human immunoglobulin G (IgG). Researchers at the Institute of Molecular Genetics at the Russian Academy of Sciences in the 1990s extended Tuftsin by three amino acids to improve stability and blood-brain barrier penetration. The result retained Tuftsin's immune modulating properties while gaining anxiolytic effects.