GABA-A receptor is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-09-13. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Clinical evidence comes mainly from small studies conducted in Russia, several of which were open-label or lacked robust blinding. Reported outcomes include lower anxiety scores, changes in attention measures, and effects on asthenic states following illness. Sample sizes are typically in the tens of participants, and independent replication outside the region is scarce. Reviews published in English generally note the limited methodological quality of the underlying trials. Whether the compound produces clinically meaningful effects under rigorous conditions remains unresolved.
Proposed mechanisms center on modulation of the GABA system, but no single molecular target has been confirmed. Rodent studies report changes in GABA-A receptor expression and in the turnover of serotonin, dopamine, and norepinephrine in several brain regions. Increases in brain-derived neurotrophic factor and its receptor have also been described after repeated administration. These findings come largely from animal models, and the degree to which they describe human neurochemistry remains an open question. The mechanism is best characterized as multi-system and not fully resolved.
Pharmacokinetic data are limited. Like most short peptides, Selank is vulnerable to plasma and tissue peptidases, and its measured half-life in circulation is short, on a minutes scale. The Pro-Gly-Pro tail slows this degradation but does not eliminate it. Intranasal administration is the route described in most reports, with absorption through the nasal mucosa and a hypothesized path into the central nervous system that avoids the blood-brain barrier. Direct measurements of human brain exposure are unavailable, so distribution claims rest on inference from animal work.
| 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 |
The compound has a calculated molecular weight near 751.9 daltons and carries a net positive charge at physiological pH because of its arginine residue. It dissolves freely in water and in common aqueous buffers, and typically appears as a white or off-white lyophilized powder. The amide backbone makes the molecule susceptible to peptidases, which limits oral use and favors intranasal or parenteral routes. Nomenclature in the literature varies: the substance is also described by the sequence abbreviation TP-7 and by a Russian trade designation.
Regulatory status differs sharply by region. Selank holds a Russian marketing authorization, where it is supplied mainly as nasal drops, while authorities elsewhere have not approved it for medical use. Material sold internationally is therefore usually labeled as a research chemical rather than a medicine. Peer-reviewed publications come predominantly from Russian laboratories, and sample sizes are generally small. Whether the compound produces comparable effects under independent, well-controlled replication remains an open question that the broader literature has not settled.
Selank is a synthetic heptapeptide developed in Russia as a structural analogue of tuftsin, a naturally occurring immunomodulatory tetrapeptide. Its sequence, Thr-Lys-Pro-Arg-Pro-Gly-Pro, keeps the tuftsin core at the N-terminus and appends a Pro-Gly-Pro tail. Researchers at the Institute of Molecular Genetics in Moscow synthesized the compound during the 1990s while searching for peptides with combined anxiolytic and immunomodulatory activity. The added tail was intended to resist enzymatic cleavage and prolong the molecule's presence in circulation.
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.
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.
If two vertices have the same mass difference of one or several amino acids, a directed edge will be applied. The SeqMS algorithm, Lutefisk algorithm, Sherenga algorithm are some examples of this type.
== Competitors == Major competitors in the United States include the United States Postal Service (USPS), FedEx, and Amazon Logistics, along with regional carriers such as OnTrac, and LSO (formerly Lonestar Overnight). In addition to these domestic carriers, UPS competes with a variety of international operators, including SF Express, Canada Post (and its subsidiary Purolator), TransForce, Deutsche Post (and its subsidiary DHL), La Poste (France) (and its subsidiary Chronopost), Royal Mail, Japan Post Service, and many other regional carriers, national postal services and air cargo handlers. Historically, the bulk of competition for UPS came from inexpensive ground-based delivery services, such as Parcel Post (USPS) or Choice Logistics. In 1998, FedEx expanded into ground parcel delivery through its acquisition of RPS (formerly Roadway Package System), rebranding it as FedEx Ground in 2000. In 2003, DHL acquired Airborne Express, expanding its operations in the United States. In response to the expansion of FedEx and DHL, UPS partnered with the US Postal Service to offer UPS Mail Innovations, a program that allows UPS to pick up mail and packages weighing under one pound separately from the main ground network and transfer them to a USPS center, or destination delivery unit (DDU), for final distribution. This process is also known as zone skipping, long used by parcel consolidators.
=== World War I === During World War I, Military commanders required vast quantities of cheap, high-calorie food to feed their millions of soldiers. As a result, demand for canned food skyrocketed; canned food would not spoil during long transport and could endure harsh conditions in the trenches. Throughout the war, British soldiers generally subsisted on low-quality canned food, such as pork and beans, British bully beef, canned sausages, and Maconochie's stew. However, by 1916, widespread dissatisfaction and increasing complaints about the poor quality of most canned food distributed to soldiers, resulted in armies seeking better-quality food to improve morale, and soon, complete meals-in-a-can began to appear. In 1917, the French Army began issuing canned French cuisine such as coq au vin, beef bourguignon, French onion soup, and leek soup, while the Italian Army experimented with canned spaghetti with Bolognese sauce, ravioli, minestrone and pasta e fagioli. Following the war, companies that had supplied canned food to the military, began to improve the quality of their goods for civilian sale.
The Australian Wagyu Association is the largest breed association outside Japan. Both fullblood and Wagyu-cross cattle are farmed in Australia for domestic and overseas markets, including China, Denmark, France, Germany, Hong Kong, Indonesia, Singapore, Taiwan, the United Kingdom and the United States. Australian Wagyu cattle are grain fed for the last 300–500 days of production. Wagyu bred in Western Australia's Margaret River region often have red wine added to their feed as well.
Exhumation, or disinterment, is the act of digging something up, especially a corpse. This is most often done to relocate a body to a different burial spot; families may make this decision to locate the deceased in a more pertinent or convenient place. In shared family burial sites (e.g. a married couple), if the previously deceased person has been buried for an insufficient period of time, the second body may be buried elsewhere until it is safe to relocate it to the shared grave. Exhumation of human remains occur for a number of other reasons, including body identification or as part of a criminal investigation. If an individual dies in suspicious circumstances, police may request exhumation to determine the cause of death. Exhumations may also occur via grave robbery or as an act of desecration. In rare, historical cases (e.g. Pope Formosus or Oliver Cromwell), a body may be exhumed for posthumous execution, dissection, or gibbeting. Notable individuals may be exhumed to answer historical questions. Exhumation by archaeologists enables the study of remains, as with many ancient Egyptian mummies that have been put on public display. In most jurisdictions, a legal exhumation usually requires a court order or permission by the next of kin of the deceased. U.S. law allows disinterment "only for the most compelling of reasons" and with the permission of close relatives and the cemetery official. Also in many countries, permits are required by some governing agency to legally conduct a disinterment.
Sources: en.wikipedia.org
==== New album: Criminal Migraine (2026–present) ==== On August 17, 2026, Ice-T released a new double album, Criminal Migraine, for digital download independently through his website. This is Ice's first new rap album in 20 years, since Gangsta Rap was released in 2006. The new album is not available on any streaming service and features guest appearances by Treach, Smoothe Da Hustler, CJ Mac and Ras Kass.
== SG == sg – (s) Sango language (ISO 639-1 code) Sg – (s) Seaborgium SG (s) Senegal (FIPS 10-4 country code) Singapore (ISO 3166 digram) Snow Grains (METAR Code) (i) Study Group SGC (i) Server Gated Cryptography (p) Stargate Command SGD – (s) Singapore dollar (ISO 4217 currency code) SGML – (i) Standard Generalized Markup Language SGP – (s) Singapore (ISO 3166 trigram) SGS (s) South Georgia and the South Sandwich Islands (ISO 3166 trigram) (i) Svalbard Ground Station (Landsat) Société Générale de Surveillance
== Frequency of use == Globally around 85 million units of red blood cells are transfused in a given year. The global demand is much higher and there is an unmet need for safe blood for transfusion in many low- and middle-income countries. In the United States, blood transfusions were performed nearly 3 million times during hospitalizations in 2011, making it the most common procedure performed. The rate of hospitalizations with a blood transfusion nearly doubled from 1997, from a rate of 40 stays to 95 stays per 10,000 population. It was the most common procedure performed for patients 45 years of age and older in 2011, and among the top five most common for patients between the ages of 1 and 44 years. According to the New York Times: "Changes in medicine have eliminated the need for millions of blood transfusions, which is good news for patients getting procedures like coronary bypasses and other procedures that once required a lot of blood." And, "Blood bank revenue is falling, and the decline may reach $1.5 billion a year this year [2014] from a high of $5 billion in 2008." In 2014, the Red Cross was predicting job losses as high as 12,000 within the next three to five years, roughly a quarter of the total in the industry. As of 2019, the trend of declining transfusions appeared to be stabilizing, with 10,852,000 RBC units transfused in the United States.
==== Immune suppressants ==== The steroid prednisone might also be used to achieve a better result, but it can lead to the worsening of symptoms and takes weeks to achieve its maximal effectiveness. Research suggests that up to 15% of people with myasthenia gravis do not positively respond to immune suppressants. Due to the myriad symptoms that steroid treatments can cause, it is not the preferred method of treatment. Other immune suppressing medications may also be used including rituximab,azathioprine and especially mycophenolate. Nipocalimab (Imaavy) was approved for medical use in the United States in April 2025.
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.
Reports describe effects on GABA-A receptor expression, monoamine turnover, and neurotrophic factor levels. These are proposed mechanisms drawn mainly from animal models. No single molecular target has been established.