heptapeptide comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-01-27. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| 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 |
Enzymatic stability motivates the extra three residues at the carboxyl end. Native tuftsin is cleaved quickly by circulating aminopeptidases and carboxypeptidases, which limits its duration of action and its usefulness as a tool compound. Extending the chain with proline-rich segments is a common design tactic because proline constrains the backbone and slows proteolysis. The same Pro-Gly-Pro motif appears in other Russian-developed peptides of the era. Whether the full seven-residue chain is required for activity, or whether it acts mainly as a prodrug releasing tuftsin, remains unresolved.
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.
Published clinical evidence is limited. Most controlled trials were conducted in Russia, enrolled modest numbers of participants, and appeared in Russian-language journals, which restricts independent verification. Reported outcomes include lower anxiety scores, improved attention and memory measures, and changes in fatigue ratings. Reviews written in English note methodological limitations such as small samples and inconsistent endpoints. Whether the compound produces clinically meaningful benefit relative to established anxiolytics is therefore an open question rather than an established finding.
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.
Solubility behavior is a practical concern for handling. Selank dissolves readily in water and in common aqueous buffers, which simplifies preparation of working solutions. The choice of solvent, ionic strength, and pH can influence aggregation over time, particularly at higher concentrations. Aqueous solutions are typically sterile-filtered before use. Because stability depends on several variables, storage and handling notes should be treated as general guidance rather than fixed rules, and specific values are best confirmed against a certificate of analysis for each batch.
Characterization of Selank in a laboratory setting relies on standard peptide methods. Reverse-phase high-performance liquid chromatography separates the target from related impurities and provides a purity figure, commonly reported as 95 percent or higher. Mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, confirms the molecular mass and helps detect truncation or modification. Amino acid analysis can verify composition when a sequence-level check is needed. These techniques together establish identity and purity for a given lot.
Lyophilized Selank, the dry powder form, is generally stored frozen at minus 20 degrees Celsius or colder for long-term keeping. The solid is hygroscopic and should stay sealed, dry, and protected from light. Once dissolved, the peptide is less stable and is usually held refrigerated at 2 to 8 degrees Celsius for short periods. Repeated freezing and thawing is avoided because it can promote aggregation and loss of activity. Buffers and pH choice also affect how long a solution remains usable.
The electronic properties of the substituents (alkyl groups enhance the basicity, aryl groups diminish it). The degree of solvation of the protonated amine, which includes steric hindrance by the groups on nitrogen.
=== Polymer chemistry === Although MS-based analyses of polymers have largely been performed using single-stage MS, tandem MS has also been used to characterize polymer components. CID is the most common method of dissociation used, but ETD has been used as a complementary method. Unique bond cleavages resulting from ETD supply valuable diagnostic information.
Das RC, Heath EC (1980). "Dolichyldiphosphoryloligosaccharide--protein oligosaccharyltransferase; solubilization, purification, and properties". Proc. Natl. Acad. Sci. U.S.A. 77 (7): 3811–5. Bibcode:1980PNAS...77.3811D. doi:10.1073/pnas.77.7.3811. PMC 349716. PMID 6933437.
=== Drugs === Chlorphenamine, a first-generation alkylamine antihistamine Creatine phosphate, a chemical used to store phosphates in the body Cyclophosphamide, a medication to suppress the immune system
(2026) reconstruct the environment of Pleistocene gazelles and Persian fallow deer from the Mughr el-Hamamah site (Jordan) on the basis of isotopic analysis of their teeth, interpret their findings as indicative of conditions that were favorable for human occupations during a humid phase of the Last Glacial cycle, and estimate that the hunting area of Early Upper Paleolithic humans from the site covered ∼36 square kilometers. García-Morato et al. (2026) review the fossil record of small-bodied mammals from Middle to Later Stone Age sites in South Africa, and report evidence of impact of site-specific ecological factors on the composition of the studied assemblages. Sawada et al. (2026) interpret burned bone fragments from the terminal Paleolithic strafa from the Fukui Cave (Japan) as more likely to be evidence of human exploitation of medium-sized artiodactyls than evidene of exploitation of large mammals that became extinct in the Pleistocene. Evidence indicating that deposition of sediments preserving bones of mammals (mostly mammoths) at The Mammoth Site (South Dakota, United States) happened during Marine Isotope Stages 6 and 7 is presented by Mahan et al. (2026). Pym et al. (2026) reconstruct changes of late Pleistocene megafaunal populations from the Isthmus of Panama on the basis of the study of spores of coprophilous fungi from sediments of the La Yeguada lake, providing evidence of three distinct phases of decline and recovery coinciding with shifts in vegetation composition. Asevedo et al.
Sources: en.wikipedia.org
There are many types of treatment for the perichondral hematoma that can lead to cauliflower ear, but the current body of research is unable to identify a single best treatment or protocol. There is definitive evidence that the drainage of this hematoma is better for the prevention of cauliflower deformity when compared to conservative treatment, but the use of bandages and/or splinting after drainage requires more research. Because an acute hematoma can lead to cauliflower ear, prompt evacuation of the blood can prevent permanent deformity. There are many described techniques for the drainage of blood in the acute stage to prevent hematoma, including aspiration and drainage, incision and drainage, use of continuous suction devices and placing a wick. After the blood has been drained, the prevention of re-accumulation becomes the most pressing issue. This has been achieved with many techniques including: direct pressure dressings, in and out mattress sutures, buttons placed on sutures, thermoplastic splints, sutured cotton balls, and absorbable mattress sutures. The use of simple drainage becomes less useful after six hours from the injury and when there is recurrent trauma. In these cases it has been suggested that open surgical treatment is more effective in returning the cosmetic appearance and prevention of recurrence. The outer ear is prone to infections, so antibiotics are usually prescribed. Pressure can be applied by bandaging which helps the skin and the cartilage to reconnect.
==== Labour and Employment, 2026-2028 ==== Lad is Inducted as Labour and Employment Minister of DK Shivakumar's Cabinet after reconstitution of Karnataka in 2026. He is also entrusted with responsibility of overseeing Dharwad District as In charge Minister.
We grew up internationally. My father thought of himself first and foremost as a Frenchman, and spent a few weeks every year with the elder children at Chambord, his main property on the Loire. I once asked him how we should describe ourselves. He replied, "We are French princes who reigned in Italy." In fact, of the twenty-four children only three including me, were actually born in Italy. At the age of ten, Zita was sent to a boarding school at Zanberg in Upper Bavaria, where there was a strict regime of study and religious instruction. She was summoned home in the autumn of 1907 at the death of her father. Her maternal grandmother sent Zita and her sister Francesca to a convent on the Isle of Wight to complete their education. Brought up as devout Catholics, the Parma children regularly undertook good works for the poor. In Schwarzau the family turned surplus cloth into clothes. Zita and Francesca personally distributed food, clothing, and medicines to the needy in Pianore. Three of Zita's sisters became nuns and, for a time, she considered following the same path. Zita went through a period of poor health and was sent for the traditional cure at a European spa for two years.
All pages with titles beginning with GR All pages with titles beginning with gr All pages with titles containing g-r All pages with titles containing GR GRS (disambiguation) Ghost Rider (disambiguation) JR (disambiguation) RG (disambiguation) G (disambiguation) R (disambiguation) GR1 (disambiguation)
Maintaining potential control in in situ measurements preserves the electrochemical environment at the electrode–electrolyte interface, thereby keeping the double layer and ongoing electron-transfer reactions intact at a given electrode potential.
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.