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Selank is a synthetic seven-amino-acid peptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, built from tuftsin with a Pro-Gly-Pro tail added.1 It was developed in Russia and is not named in Australia's Poisons Standard.2
This profile describes the compound as a laboratory chemical: identity, structure, analytical checks, handling and regulation. Titan Peptides supplies it for laboratory and research use only; it is not for human consumption.
Selank is a heptapeptide designed at the Institute of Molecular Genetics of the Russian Academy of Sciences, in cooperation with the Zakusov Research Institute of Pharmacology in Moscow. Its first four residues are tuftsin (Thr-Lys-Pro-Arg), a naturally occurring fragment of the heavy chain of human immunoglobulin G. The developers extended tuftsin at its C-terminus with three further amino acids, Pro-Gly-Pro, to make the molecule more resistant to breakdown by peptidases.
That Pro-Gly-Pro tail is the same "glyproline" unit found on Semax, its sister compound from the same institute. The two peptides are often mentioned together, but they are built on different parent molecules; see our Semax compound profile.
Chemical identifiers below are as listed by PubChem. Values are for the free peptide; salt forms such as selank acetate have a higher mass per mole.1
| Property | Selank |
|---|---|
| Class | Synthetic heptapeptide; tuftsin analogue with a C-terminal Pro-Gly-Pro |
| Sequence (one-letter) | TKPRPGP |
| Sequence (three-letter) | Thr-Lys-Pro-Arg-Pro-Gly-Pro |
| Molecular formula | C33H57N11O9 |
| Molar mass | 751.9 g/mol |
| CAS number | 129954-34-3 |
| PubChem CID | 11765600 |
| Other names | TP-7 |
| Origin | Institute of Molecular Genetics (Russian Academy of Sciences) with the Zakusov Research Institute of Pharmacology, Moscow |
Selank's sequence, TKPRPGP, carries a lysine and an arginine and no acidic side chains, so it counts as a basic peptide. For basic peptides, supplier guidance suggests starting with a small amount of an acidic solvent such as dilute acetic acid and then diluting to the working concentration; our reconstitution guide uses Selank as its worked example. Selank has none of the residues most prone to oxidation (methionine, cysteine, tryptophan), but routine peptide storage still applies: keep the sealed vial dry, dark and at −20 °C or colder, bring it to room temperature in a desiccator before opening, and split a stock into single-use frozen aliquots. See storing lyophilised and reconstituted peptides.
Selank is not named in the June 2026 Poisons Standard (SUSMP No. 48).2 Whether a product is regulated as a therapeutic good depends on how it is supplied and presented; see our guide are research peptides legal in Australia?. Selank is not an approved therapeutic good in Australia.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. Its first four residues are tuftsin, a fragment of human immunoglobulin G, and a Pro-Gly-Pro tail was added to make it more resistant to peptidases. It was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences.
PubChem lists Selank under CAS number 129954-34-3 and CID 11765600, with the synonym TP-7. For the free peptide it gives the molecular formula C33H57N11O9 and a molar mass of 751.9 g/mol; salt forms such as selank acetate weigh more per mole.
Both are heptapeptides ending in Pro-Gly-Pro, but their parent sequences are unrelated. Selank builds on tuftsin, a fragment of immunoglobulin G; Semax builds on ACTH(4-7), a hormone fragment. Selank carries no methionine, so it is less prone to oxidation than Semax.
Selank does not appear by name in the June 2026 Poisons Standard. The Therapeutic Goods Act 1989 defines therapeutic goods partly by presentation, so goods likely to be taken as being for therapeutic use are caught whatever their label says. Research-grade Selank is not an approved therapeutic good.
A chemical profile of Semax (Met-Glu-His-Phe-Pro-Gly-Pro): how the ACTH(4-7) fragment and the glyproline tail make up the molecule, why it has two names, its identifiers, oxidation-prone methionine and status.
What bacteriostatic water actually contains, how it compares with sterile water, when benzyl alcohol can interfere, and how to reconstitute a lyophilised peptide and calculate stock concentrations.
A plain-English primer on research peptides: what a peptide is, how peptides are built one amino acid at a time on a resin bead, why they arrive as a freeze-dried powder, and what "research use only" does and does not mean.
