Everything below concerns Lyophilisation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-07-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
Reported activity for Selank centers on anxiolytic and nootropic effects. Russian clinical reports describe use in anxiety and in cognitive or attention-related complaints. Most of this evidence comes from studies conducted by the same research groups that developed the peptide. Independent replication in other countries remains limited, and no major Western regulatory agency has approved the compound for any indication. The gap between local reports and external verification is a recurring point in discussions of the peptide.
Tuftsin, the parent structure, is a naturally occurring immunomodulatory tetrapeptide released from the Fc region of immunoglobulin G by spleen enzymes. Selank extends this four-residue sequence with three additional amino acids. The stated rationale is that the added tail slows enzymatic breakdown and may influence receptor interactions. How the full heptapeptide behaves at the molecular level is not firmly established, and proposed mechanisms often involve indirect modulation of neurotransmitter or immune signaling rather than a single defined target.
Selank is a synthetic heptapeptide developed in Russia. Its sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, a seven-residue chain built around the natural tetrapeptide tuftsin. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences first described the compound in the mid-1990s. The design combined the tuftsin core with an added Pro-Gly-Pro tail, a modification intended to extend the molecule's stability in biological fluids. Published work on the peptide has appeared mainly in Russian-language journals.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, written TKPRPGP in one-letter notation. Its structure consists of the immunomodulatory tetrapeptide tuftsin, Thr-Lys-Pro-Arg, extended at the carboxyl terminus by a Pro-Gly-Pro segment. The molecular formula is commonly given as C33H57N11O9, corresponding to a monoisotopic mass near 751.4 Da and an average molecular mass near 751.9 Da. All seven residues are proteinogenic amino acids, and the molecule carries no modified side chains or non-natural linkages.
The compound was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences during the 1980s and 1990s. The stated design goal was to retain the immunomodulatory and central nervous system activity attributed to tuftsin while improving resistance to enzymatic breakdown. Adding a proline-rich tail to the short parent peptide was a deliberate strategy, because proline residues restrict the conformations available to many peptidases. The same laboratory produced Semax, an ACTH fragment analog, and both compounds were developed in parallel as short, enzymatically stabilized peptides intended for intranasal use.
Selank is not a naturally occurring peptide and has no known endogenous counterpart in human physiology. Russian-language sources frequently call it TP-7, while English-language sources use the name Selank almost exclusively. Database indexing is uneven, partly because early reports appeared in regional journals that are not widely cataloged. Some summaries describe the material as a tuftsin analog and others as a synthetic heptapeptide; the labels overlap rather than conflict. Citing the primary sequence resolves ambiguity more reliably than the research or trade name alone.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Modeled on tuftsin |
| Amino acid sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Seven residues |
| Approximate molecular mass | Around 750 Da | Depends on counter-ion and hydration |
| Common forms | Lyophilized powder | Also described as aqueous solution |
| Primary origin of research | Russian laboratories | Mid-1990s onward |
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.
Dry powder is normally held at -20 degrees Celsius or lower, in a sealed container with desiccant and protection from light. Reconstituted solutions are usually kept at 2 to 8 degrees Celsius for short periods and frozen for longer ones. Proline residues at several positions are generally associated with some resistance to peptidase attack, but chemical stability still declines at neutral to alkaline pH and at elevated temperature. Exact shelf-life figures are product-specific and are not standardised across suppliers.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, with mass spectrometry used to confirm molecular mass and sequence information. Amino acid analysis and peptide mapping may supplement these methods. Certified reference standards are scarce, and many commercial lots are sold as research chemicals without a pharmacopoeial monograph. Regulatory treatment differs by country: Selank is a registered prescription medicine in Russia, while in the European Union and the United States it is not an approved drug and may fall under research-chemical or unapproved-product frameworks.
Outside its country of origin the compound is generally handled as a research chemical rather than an approved medicine. No regulatory approval from the United States Food and Drug Administration or the European Medicines Agency has been granted for human use. Identity and purity are normally checked by reverse-phase high-performance liquid chromatography, with mass spectrometry used to confirm the molecular mass. Lyophilised material is stored cold and desiccated, and repeated freeze-thaw cycles are avoided.
Published work on this peptide almost always uses intranasal delivery, with drops or a spray applied to the nasal mucosa. Some animal experiments have used subcutaneous or intraperitoneal injection, and a smaller number have compared routes directly. Oral administration is not a focus of the literature, because short peptides of this size are broken down by digestive enzymes and cross intestinal barriers poorly. How much of an intranasal dose reaches the bloodstream intact in humans remains an open question.
Animal studies have examined behaviour in tests of anxiety, memory retention and stress response, and several report changes in neurotrophic or neurotransmitter-related markers. The human evidence base is much smaller, consisting mainly of short trials conducted in Russia with limited reporting in English-language journals. Sample sizes are modest and outcome measures vary between studies, so the findings are best described as preliminary. Independent replication under modern trial standards has not been widely reported.
== Works cited == Bose, Romen (2010). The End of the War: Singapore's Liberation and the Aftermath of the Second World War. Singapore: Marshall Cavendish. ISBN 978-981-261-066-9. Legg, Frank (1965). The Gordon Bennett Story: From Gallipoli to Singapore. Sydney, New South Wales: Angus & Robertson. OCLC 3193299. Miksic, John N. (2013). Singapore & the Silk Road of the Sea, 1300–1800. Singapore: NUS Press. ISBN 978-9971-69-558-3. Smith, Colin (2006). Singapore Burning: Heroism and Surrender in World War II. Penguin military history. London: Penguin Books. ISBN 978-0-14-101036-6. Toland, John (1970). The Rising Sun: The Decline and Fall of the Japanese Empire, 1936–1945. New York, NY: Random House. LCCN 77-117669. OL 25646706M. Wigmore, Lionel (1957). The Japanese Thrust. Canberra: Australian War Memorial.
Solar purpura (also known as actinic purpura and senile purpura) is a skin condition characterized by large, sharply outlined, 1- to 5-cm, dark purplish-red bruises (purpura) appearing on the dorsa of the forearms and less often the hands. The condition is most common in elderly people of European descent. It is caused by sun-induced damage to the connective tissue of the skin. No treatment is necessary. The lesions typically fade over a period of up to three weeks.
(SC) subcutaneous (most applicable to real bites): 0.32 mg/kg, 0.28 mg/kg. (IV) intravenous: 0.25 mg/kg, 0.011 mg/kg. (IP) intraperitoneal: 0.30 mg/kg (average), 0.941 mg/kg. 0.05 mg/kg (the last quote does not make it clear if it is either intravenous or intraperitoneal). It is estimated that only 10 to 15 mg will kill a human adult; however, its bites deliver about 120 mg of venom on average, although they may deliver up to 400 mg of venom in a single bite. Severe neurotoxicity invariably ensues rapidly. This is because of several factors, including the high potency of the venom, and the unusual composition of synergistic toxins contained within the venom, which bring on severe symptoms of envenomation and death much faster than any other snake venom. In addition, the snake itself possesses the most advanced, evolved, and efficient venom delivery apparatus among all venomous snakes, and the most advanced and evolved dentition of all elapids. Black mambas possess the longest fangs of any elapid, which average around 13.1 millimeters (0.52 in), but may grow as long as 22 millimeters (0.87 in). Another feature that distinguishes the dentition and venom delivery apparatus of this species from all other elapids, as well as other species of venomous snake including those of the family Viperidae, is that the fangs are positioned well forward at the most anterior position possible in its mouth – right up in the front of the upper jaw.
Sources: en.wikipedia.org
== Spectrometric analysis == The digested protein can be analyzed with different types of mass spectrometers such as ESI-TOF or MALDI-TOF. MALDI-TOF is often the preferred instrument because it allows a high sample throughput and several proteins can be analyzed in a single experiment, if complemented by MS/MS analysis.
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The vibrator was invented in the late 19th century as a medical instrument for pain relief and the treatment of various ailments. Sometimes described as a massager, the vibrator is used on the body to produce sexual stimulation. Several clinical studies have found vibrators to be an effective solution for Erectile Dysfunction. Examples of FDA registered vibrators for erectile dysfunction include MV.Health's Tenuto and Reflexonic's Viberect.
Sources: en.wikipedia.org
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== Side effects == An overdose of bisoprolol can lead to fatigue, hypotension, hypoglycemia, bronchospasms, and bradycardia. Bronchospasms and hypoglycemia occur because at high doses, the drug can be an antagonist for β2 adrenergic receptors located in the lungs and liver. Bronchospasm occurs due to the blockage of β2 receptors in the lungs. Hypoglycemia occurs due to decreased stimulation of glycogenolysis and gluconeogenesis in the liver via β2 receptors. There have been no reported cases of clinically evident drug-induced liver injury associated with bisoprolol.
Hazard research is published: researchers report gas stoves disperse nitrogen dioxide – associated with respiratory conditions such as asthma – at unsafe levels also outside kitchens for hours (3 May), a study reported large amounts of microplastic in brains with concentrations being much larger in samples from 2024 compared to 2016 (6 May), an experimental study finds GPT-4-based large language model-powered conversational search increases selective exposure compared to conventional Web search (11 May), a study indicates fish oil omega-3 supplements, widely taken due to associations of high omega-3 levels and good health or cognition, might be a substantial risk factor for atrial fibrillation and stroke except for those who took these already having atrial fibrillation (21 May), and researchers report continued transmission of bird flu within dairy cattle and show that their raw milk can infect mice (24 May).
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Sources: en.wikipedia.org
Selank is a synthetic peptide made of seven amino acids. It is modeled on tuftsin, a natural tetrapeptide, with an added three-residue tail. It is not a small-molecule drug.
It originates from research in Russia, associated with the Institute of Molecular Genetics of the Russian Academy of Sciences. The first descriptions date to the mid-1990s. Most published studies come from Russian laboratories.
No, Selank itself does not occur naturally. Its backbone is based on tuftsin, which is produced in the body, but the seven-residue version is a synthetic construct. It is supplied as a manufactured peptide.
The sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, written TKPRPGP in one-letter code. It combines the tetrapeptide tuftsin with a carboxyl-terminal Pro-Gly-Pro extension. This full sequence identifies the molecule more precisely than the research name.