If you have been reading about Pro-Gly-Pro and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-01-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Measuring peptide exposure inside the brain is technically difficult. Selank is degraded rapidly in plasma, and assays must separate intact peptide from fragments, which favors targeted mass spectrometry over immunoassays alone. Reported half-lives are short, on the order of minutes, so effects observed hours later are attributed to downstream signaling rather than to the parent compound. Blood-brain barrier permeability is debated and rarely quantified directly. Gaps include absent dose-response characterization, inconsistent reporting of purity, and almost no pharmacokinetic data from human participants.
Selank is studied chiefly as an animal-model anxiolytic with proposed secondary effects on memory and immune signaling. Reported mechanisms include modulation of the GABA-A receptor complex, inhibition of enkephalin-degrading enzymes, and shifts in monoamine turnover within limbic structures. Some experiments describe increased expression of brain-derived neurotrophic factor in the hippocampus after repeated dosing. No single molecular target has been confirmed, and the peptide does not bind any receptor with the selectivity typical of a conventional small-molecule drug. Mechanism therefore remains a set of hypotheses rather than an established pathway.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C33H57N11O9 | Derived from the seven-residue sequence |
| Molecular weight | About 751.9 g/mol | Average mass; the monoisotopic value is slightly lower |
| Residue count | Seven amino acids | Thr-Lys-Pro-Arg-Pro-Gly-Pro |
| Parent compound | Tuftsin (Thr-Lys-Pro-Arg) | Selank extends tuftsin at the C-terminus |
| Compound class | Synthetic short peptide | Studied in a research setting; not a licensed drug in most markets |
Naming for this compound is not fully standardised in English sources. The spelling Selanc appears in some transliterations, and catalogue entries may instead list the peptide sequence itself as the identifier. Reference material sometimes groups it with other short synthetic peptides studied for behavioural effects, which can create confusion when citations are compared. Distinguishing the exact sequence from related tuftsin analogues is therefore a practical first step when reviewing any dataset or specification sheet.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, frequently abbreviated as TKPRPGP. It was designed as a structural analogue of tuftsin, a naturally occurring tetrapeptide released by enzymatic cleavage of the immunoglobulin heavy chain. The two additional proline residues at the C-terminal end extend the parent chain and change how the molecule behaves in solution. The free peptide has a calculated molecular mass of approximately 751.9 g/mol and is generally supplied as a lyophilised white to off-white powder.
Development work on the compound began in the 1980s and 1990s at the Institute of Molecular Genetics in Moscow, within the same research programme that produced the peptide Semax. Early investigators sought a tuftsin derivative with improved resistance to enzymatic breakdown and with activity in the central nervous system after peripheral administration. Most of the primary literature from this period was published in Russian, a factor that still shapes how easily the findings can be checked by outside groups.
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.
The crests and frills of some dinosaurs, like the marginocephalians, theropods and lambeosaurines, may have been too fragile to be used for active defense, and so they were likely used for sexual or aggressive displays, though little is known about dinosaur mating and territorialism. Head wounds from bites suggest that theropods, at least, engaged in active aggressive confrontations.
==== Including Restore Britain prior to formation ==== In June 2025, former Reform MP Rupert Lowe launched a political organisation called "Restore Britain", advocating a harder line on immigration than Reform UK. Find Out Now were asked by the organisation to poll on a hypothetical new party led by Lowe. In February 2026, Lowe announced that Restore Britain would become a political party.
A minor figure in the British Union of Fascists (BUF) at the time, Hamm moved to the Falkland Islands in 1939 to work as a teacher. He was arrested there (under Defence Regulation 18B) in 1940 for encouraging fascist views among his pupils and his BUF membership and later transferred to a prison camp in South Africa.
=== Composition and selectivity === Condensate components are usually divided into scaffolds, which drive phase separation, and clients, which do not phase separate on their own but can still be recruited into the dense phase. Client recruitment depends on the number of available binding sites as well as the valency and affinity of the client, so changes in scaffold stoichiometry can alter the composition of the condensate. Partitioning is also influenced by physical factors that are distinct from specific binding. Because condensates consist of dense networks of intrinsically disordered regions (IDRs), inserting a molecule restricts the conformational freedom of the surrounding chains, resulting in an entropic penalty that increases with particle size. Calculations combined with coarse-grained modelling show that the free energy of insertion increases with both IDR density and particle size, and becomes dependent on particle surface area once the particle is larger than the network mesh size. At typical IDR concentrations, particles as small as 4 nm in diameter can be almost entirely excluded, with approximately 97% exclusion in the absence of favourable interactions with condensate components.
The formylation reaction is proposed to occur through a direct transfer reaction in which the amine group of GAR nucleophilically attacks N10-formyl-THF creating a tetrahedral intermediate. As the α-amino group of GAR is relatively reactive, deprotonation of the nucleophile is proposed to occur by solvent. In the active site, Asn 106, His 108, and Asp 144 are positioned to assist with formyl transfer. However, mutagenesis studies have indicated that these residues are not individually essential for catalysis, as only mutations of two or more residues inhibit the enzyme. Based on the structure the negatively charged Asp144 is believed to increase the pKa of His108, allowing the protonated imidazolium group of His108 to enhances the electrophilicity of the N10-formyl-THF formyl group. Additionally, His108 and Asn106 are believed to stabilize the oxyanion formed in the transition state.
Sources: en.wikipedia.org
There, they joined former presidents Bill Clinton and Jimmy Carter. Alongside the 2014 United States–Africa Leaders Summit, Bush, Michelle Obama, the State Department, and the George W. Bush Institute hosted a daylong forum on education and health with the spouses of the African leaders attending the summit. Bush urged African leaders to avoid discriminatory laws that make the treatment of HIV/AIDS more difficult. On November 2, Bush spoke at an event to 200 business and civic leaders at the George W. Bush Presidential Library and Museum to raise awareness of the upcoming Museum of the Bible in Washington, D.C. On November 11, Bush published a biography of his father titled 41: A Portrait of My Father. In an interview published by Israel Hayom magazine on June 12, 2015, Bush said that "boots on the ground" would be needed to defeat the Islamic State of Iraq and the Levant (ISIS). He added that people had said during his presidency that he should withdraw American troops from Iraq, but he chose the opposite, sending 30,000 more troops to defeat Al Qaeda in Iraq, and that they indeed were defeated. Bush was also asked about Iran but declined to answer, stating that any answer he gives would be interpreted as undermining Obama. During the early stages of the 2016 Republican presidential primaries, Bush spoke and campaigned for his brother Jeb Bush at a South Carolina rally. However, the party's nomination eventually went to Donald Trump, whom Bush refused to endorse. Furthermore, he did not attend the party's convention.
=== Stockpiling and sourcing of drugs === A 2017 study found that four U.S. states that allow capital punishment are stockpiling lethal-injection drugs that are in short supply and may be needed for life-saving medical procedures elsewhere. The federal level also involves the stockpiling of lethal-injection drugs, raising questions about their source. At least one alleged supplier, Absolute Standards, is neither registered with the FDA, nor registered as a controlled substances manufacturer with the DEA, and has seen investigations over its alleged involvement.
Although the general abstraction can be this simple one must remember that the detalis of this type of processes are highly complex and only recently better understood. Another general pattern observed is that, although remodeling is an inherently microscopical phenomena, there are emergent function and order that arises from the interaction single remodeling agents. The most common way in which this happen is due to single cells trying to reach a local homeostasis, and by doing so actually give rise to a macroscopic function (optimization, healing etc.) and more generally functional structural changes. One very good example of this is the case of fibroblasts in collagen matrix. The remodeling in this case, as explained in the reference, is due to the alignment of the collagen fibers with the principal directions of stress actuated by the fibroblasts. The interesting part is that they do so in such a way as to reach a "stress homeostasis": although the tissue is forced in tension they perceive none, but only after they have remodeled the neighboring as to create an effective stress shield by reinforcing the material where needed. When the tissue is relaxed again, they find themselves in an unnaturally stressed position and change their surroundings trying to reach again a zero stress state (the original one). In reaching such dynamic equilibrium fibroblasts further cooperate by disposing themselves in lines. In this way it's easier to "shield" themselves (as it is more efficient to build houses one right next to the other).
=== Role of metabolism in cancer === The role of PI-3-kinase in anabolic signaling by insulin, IGF-1, and other growth factors makes a straightforward link between metabolism and cancer, especially in light of the discovery that the PIK3CA gene encoding PI-3-kinase is an oncogene. In recent years Cantley and colleagues have made additional links between metabolic regulation and oncogenic transformation with their discovery that the M2 isoform of pyruvate kinase is associated with cancer. This discovery provides a molecular basis for understanding the Warburg effect. Cantley is now a major player in the resurgence of the importance of the Warburg effect in the process of oncogenesis.
Coaxil (BG, CR, CZ, EE, HU, LT, LV, PL, RO, RU, SK UA) Salymbra (EE) Stablon (AR, AT, BR, FR, HK, IN, ID, MY, MX, PK, PT, SG, SK, TH, TT, TR, VE) Tatinol (CN) Tianeurax (DE) Tynept (IN) Zinosal (ES) Tianesal (PL)
Sources: en.wikipedia.org
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.
Tuftsin contains four residues, while selank carries an additional Pro-Gly-Pro segment at the carboxyl end. That extension is intended to reduce enzymatic cleavage. Comparative pharmacokinetic data in humans remain limited.
No single receptor target is widely accepted as the definitive mediator of the reported effects. Proposed contributors include GABAergic modulation, shifts in monoamine turnover, and altered neuropeptide degradation. The mechanism is treated in the literature as unresolved.
Intranasal administration predominates in both animal and human research because it avoids hepatic first-pass metabolism. Injectable and intraperitoneal routes appear in animal work mainly for comparison.