Everything below concerns Regulatory peptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-01-29. 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 |
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.
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.
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.
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.
Concurrently, entrenched systemic instability across sub-Saharan Africa—manifested in brutal internal power struggles like the Sudanese Civil War, which displaced millions and triggered catastrophic humanitarian crises—and the explosive regional spillover of the Israel–Hamas war in the Middle East collectively underscore a new paradigm where localized conflicts rapidly become major tests of global diplomatic resilience, international law, and resource security. The rapid convergence of the 21st-century artificial intelligence boom with consumer hardware has systematically democratized lethality, introducing unprecedented threats to human life across global battlefields. Historically, electronic warfare (EW) served as a primary defense by jamming the radio control signals between a human pilot and a drone. However, the integration of lightweight, commercial machine learning chips has effectively rendered traditional jamming obsolete. In modern high-intensity theaters, military and non-state entities alike are deploying mass-produced, off-the-shelf First-Person View (FPV) hobby quadcopters equipped with modular AI edge-computing packages. These systems use basic computer vision algorithms to execute "last-mile" autonomous targeting; if a drone loses its communications link, the onboard AI dynamically sifts through visual feeds, independently locks onto human silhouettes or vehicles, and guides the munition to its target without human intervention.
=== Microfibrilated cellulose === Micro cellulose (MFC) is a type of nanocellulose that is more heterogeneous than cellulose nanofibers or nanocrystals as it contains a mixture of nano- and micro-scale particles. The term is sometimes misused to refer to cellulose nanofibers instead.
The White Liberation Movement (Afrikaans: Blanke Bevrydingsbeweging, abbreviated BBB) was a South African neo-Nazi organisation which became infamous after being banned under the Apartheid regime, the first right-wing organisation to be banned as such. It regarded itself as the most far-right organisation in South Africa.
response element Any short sequence of DNA that serves some function related to the activity of a protein or other biomolecule, especially a sequence within a promoter region that is able to bind specific transcription factors in order to regulate transcription of specific genes.
== History == Azvudine was first found in literature in a patent filed by Chang Jun-biao of Zhengzhou University. It received its current name in 2009, when researchers at Roche independently discovered it as a Hep C RNA polymerase inhibitor in vitro. In the following years, Chinese scientists tested it in vitro for a number of targets, most importantly HBV (human and duck) and HTLV-1, two viruses with a reverse transcriptase. It was first proposed as an HIV treatment in 2011, when in vitro tests by the Chang group provided positive results. In 2014, its oral pharmokinetics in rats was elucidated. A phase II study (NCT04109183) was finished in March 2019 by Genuine Biotech. In August 2020, the Chang group found that the substance inhibits vif in vitro. In the same month, China's drug regulator (NMPA) decided to fast-track the approval process, labelling it a first-in-class medication. In July 2021, NMPA granted conditional approval for HIV-1. It was included in the 2021 HIV treatment recommendnation by the Chinese Medical Association and Chinese CDC, published October that year. Curiously, no full results of the trial have been made available for this study in any journal detailing the experiment design as of December 2022. Parts of the results are shown on the drug monograph as well as a 2022 slides deck produced by Genuine for the NHSA available on the latter's website. Azvudine was found to inhibit some coronaviruses in vitro around 2020, leading to an interest in its use in COVID.
Sources: en.wikipedia.org
Argiopine: contains 2,4-dihydroxyphenylacetic acid. It is also named Arg-636. Argiopinines: (4-hydroxyindol-3-yl) acetic acid is carried as the chromophore. These molecules are: Arg-630, Arg-658, Arg-659, Arg-744, Arg-759. Pseudoargiopinines: They contain a (indol-3-yl) acetic acid. This group is composed of: Arg-373, Arg-728, Arg-743.
(Feb 2011) found that, "The increase in zeaxanthin appears to surpass the decrease in violaxanthin in spinach" and commented that the discrepancy could be explained by "a synthesis of zeaxanthin from beta-carotene", however they noted further study is required to explore this hypothesis.
==== PINK1, PARK7, PRKN ==== PINK1 (PARK6), PARK7 (DJ-1), and PRKN (PARK2, PARKIN) are all involved in mitochondrial activity. Mutations in these genes may cause mitochondrial dysfunction, an element of both idiopathic and familial PD. In addition, the PRKN gene encodes E3 ubiquitin ligase, which is involved in degradation of damaged proteins by ubiquitin. Many different PRKN-related mutations occur, leading to loss of protein or to protein-related loss of function. PRKN is the most common cause of autosomal-recessive PD, accounting for nearly 50% of typical early-onset parkinsonism. PRKN mutations account for 77% of juvenile PD cases. PINK1 encodes PTEN-induced putative kinase 1, and is the second-most common cause of autosomal-recessive PD. The PARK7 gene is located on chromosome 1p36 and encodes the DJ-1 protein. The DJ-1 protein is involved in cellular sensing of oxidative stress. DJ-1 related PD is rare, occurring in 0.4% - 1% of patients with early-onset PD.
=== Effect on Tumour Cells === Cancer-associated fibroblasts negatively influence the outcome of oncological diseases. These cells create a stromal niche for cancer cells and especially cancer stem cells, where they employ both paracrine and direct cell-contact to maintain stemness in cancer stem cells. In turn, this enables these cancer stem cells to escape chemotherapy and radiotherapy, while the cancer-associated fibroblasts also create an environment that allows cancer cells to escape the action anti-tumour immunity. In turn, this promotes the cancer process through tumour growth and also fosters angiogenesis, metastasis and immune evasion. CAF express various cytokines and factors, which activate and contribute to pathways favouring tumorigenesis. They may disrupt normal cell functions, such as cell cycle regulation and cell death, or signal to specific types of cells to mobilize and activate their pro-tumour actions. Furthermore, it has been found that the effect of CAF on neoplastic cells is unique to the type of tumour cells. Cytokine release from CAFs have been linked to breast carcinomas through the metabolism and production of androgen synthesis enzymes. Furthermore, on the topic of the progression of breast cancer, CAFs induces the release growth factors such as FGF and HGF which in turn induces the hyperproliferation of epithelial cells of the breast. EMT and ECM reorganisation are further mechanisms by which the CAFs induce cancer. FSP1, which is secreted by CAFs, promotes tumours through another method - by altering the tumour microenvironment (TME).
This does not replace the refrigeration system but facilitates cooling down of the external machinery. Containers stowed on the exposed upper deck are air-cooled, while those under deck are water-cooled. The water cooling design allows additional refrigerated containers under deck, as water can be used to dissipate the high amount of heat they generate. This system draws fresh water from the ship's water supply, which in turn transfers the heat through heat exchangers to the abundantly available sea water.
Sources: en.wikipedia.org
The term "computer virus" may be used as an overarching phrase to include all types of true viruses, malware, including computer worms, Trojan horses, most rootkits, spyware, dishonest adware and other malicious and unwanted software (though all are technically unique), and proves to be quite financially lucrative for criminal organizations, offering greater opportunities for fraud and extortion whilst increasing security, secrecy and anonymity. Worms may be utilized by organized crime groups to exploit security vulnerabilities (duplicating itself automatically across other computers a given network), while a Trojan horse is a program that appears harmless but hides malicious functions (such as retrieval of stored confidential data, corruption of information, or interception of transmissions). Worms and Trojan horses, like viruses, may harm a computer system's data or performance. Applying the Internet model of organized crime, the proliferation of computer viruses and other malicious software promotes a sense of detachment between the perpetrator (whether that be the criminal organization or another individual) and the victim; this may help to explain vast increases in cyber-crime such as these for the purpose of ideological crime or terrorism. In mid July 2010, security experts discovered a malicious software program that had infiltrated factory computers and had spread to plants around the world. It is considered "the first attack on critical industrial infrastructure that sits at the foundation of modern economies," notes the New York Times.
110 (7): 955–963. doi:10.1172/JCI15918. PMC 151154. PMID 12370273. Weening, Jan J.; d'Agati, Vivette D.; Schwartz, Melvin M.; Seshan, Surya V.; Alpers, Charles E.; Appel, Gerald B.; Balow, James E.; Bruijn, J.A.N. A.; Cook, Terence; Ferrario, Franco; Fogo, Agnes B.; Ginzler, Ellen M.; Hebert, L.E.E.; Hill, Gary; Hill, Prue; Jennette, J. Charles; Kong, Norella C.; Lesavre, Philippe; Lockshin, Michael; Looi, Lai-Meng; Makino, Hirofumi; Moura, Luiz A.; Nagata, Michio; International Society of Nephrology Working Group on the Classification of Lupus Nephritis; Renal Pathology Society Working Group on the Classification of Lupus Nephritis (2004). "The classification of glomerulonephritis in systemic lupus erythematosus revisited". Kidney International. 65 (2): 521–530. doi:10.1111/j.1523-1755.2004.00443.x. hdl:20.500.12648/8230. PMID 14717922. d'Agati, Vivette D.; Fogo, Agnes B.; Bruijn, Jan A.; Jennette, J.Charles (2004). "Pathologic classification of focal segmental glomerulosclerosis: A working proposal". American Journal of Kidney Diseases. 43 (2): 368–382. doi:10.1053/j.ajkd.2003.10.024. PMID 14750104. Jennette, J. C.; Falk, R. J.; Bacon, P. A.; Basu, N.; Cid, M. C.; Ferrario, F.; Flores-Suarez, L. F.; Gross, W. L.; Guillevin, L.; Hagen, E. C.; Hoffman, G. S.; Jayne, D. R.; Kallenberg, C. G. M.; Lamprecht, P.; Langford, C. A.; Luqmani, R. A.; Mahr, A. D.; Matteson, E. L.; Merkel, P. A.; Ozen, S.; Pusey, C. D.; Rasmussen, N.; Rees, A. J.; Scott, D. G. I.; Specks, U.; Stone, J. H.; Takahashi, K.; Watts, R. A. (2013).
==== Maturation and export ==== The localization of some of the Pvd proteins in the periplasm and the outer membrane (such as PvdN, PvdO, PvdP, and PvdQ) have been interpreted to suggest that portions of the maturation of pyoverdine takes place in this location, perhaps after being transported into the periplasm by PvdE, which is homologous to ABC type exporters. How completely matured pyoverdine is exported from the cell remains unclear. Once completely matured, pyoverdine is exported from the periplasm by PvdRT-OpmQ efflux pump.
Unlike gelatine, gulaman sets at room temperature and is uniquely thermo-reversible. If melted at higher temperatures, it can revert to its original shape once cooled down. Carrageenan jelly also sets more firmly than agar and lacks agar's occasionally unpleasant smell during cooking. The use of carrageenan as a gelatine substitute has spread to other parts of the world, particularly in cuisines with dietary restrictions against gelatine, like kosher and halal cooking. It has also been used in prepackaged Jello shots to make them shelf stable at room temperatures. Konjac is a gelling agent used in many Asian foods, including the popular konnyaku fruit jelly candies.
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.