A practical reference on Selank: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-07-07 and is reviewed periodically as new material appears.
Selank is a synthetic heptapeptide developed in Russia during the 1990s. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences designed it as a stabilized analog of tuftsin, a naturally occurring immunomodulatory tetrapeptide. The compound has been studied primarily for its reported anxiolytic and nootropic effects. It remains largely unknown in Western pharmacology and is not approved as a medicine by major regulators such as the FDA or the EMA.
The primary structure of Selank is Thr-Lys-Pro-Arg-Pro-Gly-Pro, corresponding to the molecular formula C33H57N11O9 and a monoisotopic mass of roughly 751.9 daltons. The N-terminal threonine and the arginine residue in the fourth position are shared with tuftsin, which carries the sequence Thr-Lys-Pro-Arg. The three additional residues at the C-terminus, Pro-Gly-Pro, extend the chain and are associated with greater resistance to enzymatic degradation. This extension also separates Selank from the shorter parent peptide.
Naming conventions place Selank in the same research family as Semax, another Russian-developed peptide investigated for cognitive effects. The two compounds share a lineage but differ in sequence and in the biological systems proposed as their targets. Semax descends from ACTH fragments, whereas Selank descends from tuftsin. Publications sometimes identify Selank by its full peptide sequence or by laboratory codes rather than one uniform trade name. Because replication outside Russia is limited, reports on its properties are best read alongside the study design and the purity of the material tested.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed as a stabilized analogue of tuftsin, a naturally occurring tetrapeptide fragment derived from the immunoglobulin heavy chain. The additional Pro-Gly-Pro segment at the carboxyl terminus is intended to slow enzymatic cleavage. The compound is usually described in the literature as a synthetic peptide with anxiolytic and cognitive-related activity, a label that reflects a research context rather than an approved therapeutic category.
Most published work on selank originates from a small number of research groups in the Russian Federation. A large share of that record appears in Russian-language journals, which limits access for readers who rely on English-indexed databases. Independent replication by laboratories outside the original research network is sparse in publicly available sources. This concentration of origin and language is a frequently noted feature when the compound is summarized in broader reviews of synthetic peptides.
Reported pharmacological effects center on reduced anxiety-like behavior in animal models and on measures of memory and learning. Proposed contributing mechanisms include modulation of GABAergic signaling, shifts in monoamine turnover, and changes in the activity of enzymes that degrade neuropeptides. Effects on the expression of genes linked to neuroplasticity have also been described. No single molecular target is widely accepted, and whether the behavioral findings arise from one pathway or several remains an open question.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic heptapeptide | Stabilized analog of tuftsin |
| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Single-letter form: TKPRPGP |
| Molecular formula | C33H57N11O9 | Monoisotopic mass about 751.9 Da |
| Appearance | White to off-white powder | Typically supplied as lyophilized solid |
| Solubility | Freely soluble in water | Also soluble in common polar solvents |
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. Its four N-terminal residues reproduce tuftsin, a tetrapeptide fragment of the immunoglobulin heavy chain, while the C-terminal Pro-Gly-Pro extension is a synthetic addition. The peptide has a molecular mass near 752 daltons and carries a net positive charge at physiological pH because of the arginine and lysine side chains. Published indexes list it under the name Selank and the sequence abbreviation TKPRPGP. Solid-phase peptide synthesis is the standard production route for research quantities.
Development took place at the Institute of Molecular Genetics of the Russian Academy of Sciences, where a series of short peptides were designed in the 1980s and 1990s. Selank was selected from variants of tuftsin that showed resistance to plasma peptidases. Russian regulatory approval covers it as an anxiolytic agent given intranasally. Outside that market the compound is normally handled as a research chemical rather than a medicine, and no widely recognised international pharmacopoeial monograph exists. The name Selank is a coined trade designation rather than a systematic chemical name.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences as a structural analogue of tuftsin, a naturally occurring tetrapeptide fragment of the immunoglobulin heavy chain. The added Pro-Gly-Pro tail was intended to slow enzymatic degradation and extend biological activity. In Russia it is registered as an anxiolytic nasal preparation, while regulators elsewhere have not approved it for clinical use.
Proposed mechanisms centre on modulation of the GABAergic system, with reports of altered expression of genes related to GABA-A receptor subunits and changed monoamine turnover. Some studies describe inhibition of enkephalinase, the enzyme that degrades endogenous enkephalins, which may prolong opioid peptide signalling. Effects on brain-derived neurotrophic factor and on cytokine expression have also been reported. These findings come largely from animal models and small human studies, and the precise primary target remains unresolved.
Based on this, Tanzi has proposed that Alzheimer’s pathology - amyloid plaques, tau-tangles, and neuroinflammation - evolved as an orchestrated host defense system for the brain In other studies, Tanzi and his trainee, Zhongcong Xie, published several seminal papers providing the first evidence that the widely used general inhalant anesthetic, isoflurane, induces Abeta generation, apoptosis, and neurodegeneration in the mouse brain and post-operative CSF of patients. This has gradually led to a dramatic reduction in the clinical use of isoflurane in the operating room, especially in elderly patients and Alzheimer's patients. Music In musical pursuits, Tanzi has served as a studio keyboard player for Joe Perry and Aerosmith. He also co-wrote the tribute song to Alzheimer's patients called "Remember Me", performed by singer Chris Mann. He plays keyboards on the albums: Aerosmith: Music from Another Dimension by Aerosmith and Joe Perry's Switzerland Manifesto and Switzerland Manifesto MKII He has also performed with the legendary opera star, Renee Fleming.
Other polypeptides and proteins such as amylin and the β amyloid peptide do not have a simple consensus sequence and are thought to aggregate through the sequence segments enriched with hydrophobic residues, or residues with high propensity to form β-sheet structure. Among the hydrophobic residues, aromatic amino-acids are found to have the highest amyloidogenic propensity. Cross-polymerization (fibrils of one polypeptide sequence causing other fibrils of another sequence to form) is observed in vitro and possibly in vivo. This phenomenon is important, since it would explain interspecies prion propagation and differential rates of prion propagation, as well as a statistical link between Alzheimer's and type 2 diabetes. In general, the more similar the peptide sequence the more efficient cross-polymerization is, though entirely dissimilar sequences can cross-polymerize and highly similar sequences can even be "blockers" that prevent polymerization.
Contraction of the diaphragm (an upwardly domed sheet of muscle that separates the thoracic cavity from the abdominal cavity) and of the intercostal muscles (which lift up the ribs) increases the volume of the thoracic cavity. Because of this increased volume, the lungs (which comprise elastic connective tissue) begin to inflate. Air, usually, enters from the nose. From the nose, air travels into the trachea (the largest of airways) into the two main bronchi, which branch into progressively narrower secondary and tertiary bronchi, which in turn branch into numerous smaller tubes known as the bronchioles, which in turn open into the alveoli. The process of "respiration" is used to describe three distinct but related processes in the human body: cellular respiration, physiological respiration, and ventilation (or, breathing).
Sources: en.wikipedia.org
== Structure and variations == The amino acid sequence is reasonably highly conserved among mammalian species, with the native human sequence being YQPPSTNKNTKSQRRKGSTFEERK or Tyr‑Gln‑Pro‑Pro‑Ser‑Thr‑Asn‑Lys‑Asn‑Thr‑Lys‑Ser‑Gln‑Arg‑Arg‑Lys‑Gly‑Ser‑Thr‑Phe‑Glu‑Glu‑Arg‑Lys. However, there are also several other splice variants of IGF-1 aside from MGF. Multiple forms of MGF are used in scientific research such as the native mouse or rat form which have several amino acid changes, or a consensus sequence mainly based on the human sequence but with the arginine changed to histidine at position 23 and sometimes other substitutions, to more closely resemble the rodent version. Since mechano growth factor is rapidly metabolised in vivo, synthetic versions often use two or more unnatural D-amino acids in the central "QRRK" domain at positions 13-16 to improve metabolic stability, the tyrosine residue may also be PEGylated in these peptides.
There is some difficulty over the correct name of the capital. Early despatches contain reference to both Port Stanley and Stanley. Port Stanley was accepted by the Naming Commission set up in 1943 to consider the names then being included on the War Office maps. Local opinion differs on the matter, but there is no doubt that Stanley is now common usage and has been for some considerable time. The capital is defined as Stanley in the Interpretation and General Law Ordinance. In the circumstances I would advise that the correct name for the capital is Stanley.
Trump repeatedly called some immigrants subhuman, stating they are "not human", "not people", and "animals", who will "rape, pillage, thieve, plunder and kill" American citizens, that they are "stone-cold killers", "monsters", "vile animals", "savages", and "predators" that will "walk into your kitchen, they'll cut your throat", and "grab young girls and slice them up right in front of their parents". Other rhetoric includes false statements that foreign leaders are deliberately emptying insane asylums to send "prisoners, murderers, drug dealers, mental patients, terrorists" across the southern border as migrants, that they are "building an army" of "fighting age" men to attack Americans "from within", and are the "enemy from within" who are ruining the "fabric" of the country. Since fall 2023, Trump claimed that immigrants are "poisoning the blood of our country", which drew comparisons to racial hygiene rhetoric used by white supremacists and Adolf Hitler. In the 20 rallies that occurred after Trump's debate with Harris, Politico cited experts who found that Trump's rhetoric strongly echoed authoritarian and Nazi ideology; Trump made claims that immigrants are genetically predisposed to commit crimes and have "bad genes".
Sources: en.wikipedia.org
Selank is a synthetic heptapeptide designed as a stabilized analog of the natural tetrapeptide tuftsin. It has been investigated mainly for anxiolytic and cognitive effects. It is not an approved pharmaceutical in most countries.
It was developed in Russia, at the Institute of Molecular Genetics of the Russian Academy of Sciences, during the 1990s. Most published research originates from Russian institutions. Independent international replication remains limited.
Tuftsin is a natural tetrapeptide with the sequence Thr-Lys-Pro-Arg that participates in immune signaling. Selank extends that sequence with Pro-Gly-Pro at the C-terminus. The added residues are linked to greater resistance to enzymatic breakdown.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, designed as a metabolically stabilized analogue of the endogenous tetrapeptide tuftsin. It has been studied mainly against anxiety-related and cognitive endpoints rather than as an approved medicine in most jurisdictions.