Selank raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-01-27. Anything still debated is marked as such rather than presented as settled.
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.
Quality assessment of Selank samples typically combines purity determination with identity confirmation and counter-ion analysis. Purity is usually reported as a percentage by chromatographic area, with values above 95 percent often quoted for research-grade material. Water content and residual solvents are checked in lyophilized batches because they affect both stability and accurate mass determination. A reported purity figure does not by itself establish that a sample is the intended sequence, so orthogonal methods are needed to rule out sequence isomers or truncation products.
Characterization of Selank in laboratory settings relies on standard peptide analytical techniques. Reverse-phase high-performance liquid chromatography separates the peptide from related impurities and degradation products, while mass spectrometry confirms molecular identity through accurate mass measurement. Amino acid analysis and peptide sequencing verify the primary structure when reference material is unavailable. Because Selank is a short chain, fragmentation-based analysis produces a diagnostic ion pattern that supports confident identification.
Peptide stability depends strongly on temperature, moisture, and pH. Lyophilized Selank is generally most stable when stored cold and dry, with freezer temperatures commonly used for long-term storage. In solution, the compound is susceptible to hydrolysis and to microbial growth if it is not handled aseptically. The C-terminal proline-rich extension appears to slow enzymatic cleavage relative to tuftsin, though quantitative degradation rates vary with the matrix and the conditions tested. Published stability data specific to Selank remain sparse.
| 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 |
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.
Laboratory work relies on standard behavioral paradigms. Rodents are tested in the elevated plus maze, open field, and passive avoidance tasks, with outcomes compared against diazepam or vehicle controls. Intranasal dosing is used most often because it bypasses first-pass metabolism, though intraperitoneal and intravenous routes also appear in published protocols. Biochemical endpoints include tissue BDNF concentrations, cytokine levels, and monoamine metabolites. Human data are limited to small Russian trials reporting reduced anxiety scores; most were not prospectively registered, and few employed independent outcome assessment.
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.
Food and Drug Administration (FDA) also assigned it to a Schedule I classification, and the International Olympic Committee banned it as a potential doping agent. Anecdotal reports concerning ibogaine's effects appeared in the early 1960s. Its anti-addictive properties were discovered accidentally by Howard Lotsof in 1962, at the age of 19, when he and five friends—all heroin addicts—noted subjective reduction of their craving and withdrawal symptoms while taking it. Further anecdotal observation convinced Lotsof of its potential usefulness in treating substance addictions. He contracted with a Belgian company to produce ibogaine in tablet form with the name Endabuse for clinical trials in the Netherlands, and was awarded a United States patent for the product in 1985. The first objective, placebo-controlled evidence of ibogaine's ability to attenuate opioid withdrawal in rats, was published by Dzoljic et al. in 1988. Diminution of morphine self-administration was reported in preclinical studies by Glick et al. in 1991. Cappendijk et al. demonstrated reduction in cocaine self-administration in rats in 1993, and Rezvani reported reduced alcohol dependence in three strains of "alcohol-preferring" rats in 1995. As the use of ibogaine spread, its administration varied widely; some groups administered it systematically using well-developed methods and medical personnel, while others employed haphazard and possibly dangerous methodology. Lotsof and his colleagues, committed to the traditional administration of ibogaine, developed treatment regimens themselves.
== Spin-off characters == Leslian Marie Gold (レスリー星人マリー・ゴールド, Resurī Seijin Marī Gōrudo): An S.P.D. officer from Planet Leslie with the power to temporarily stop time who serves as Deka Gold (デカゴールド, Deka Gōrudo) and appears exclusively in the film Tokusou Sentai Dekaranger The Movie: Full Blast Action. While working undercover as a nightclub singer to investigate the Gas Drinkers' attack on Leslie, she encounters and falls in love with Ban. Marie Gold is portrayed by Chiharu Niiyama (新山 千春, Niiyama Chiharu) while her singing voice is provided by Sae (小枝). Kight Reidlich (カイト・レイドリッヒ, Kaito Reidorihhi): The corrupt chief of the Space Police's Galactic District Police Bureau who appears exclusively in the direct-to-video anniversary special Tokusou Sentai Dekaranger: 10 Years After. Two years prior, Kruger discovered Reidlich had been selling confidential information to the space mafia Qurlian Family (キルリアンファミリー, Kirurian Famirī), but the latter captured him and used his Master License's Mirage Dimension to pose as Kruger and frame him for killing the Qurlians and their Clementian hostage. However, the hostage's daughter Carrie witnessed everything and seeks the Dekarangers' help in stopping Reidlich in the present. After the Dekarangers expose him and rescue Kruger, Reidlich sacrifices his underlings, Assam Asimov and Mugi Grafton, to power his Neo Hyper Muscle Gear and overwhelm the Dekarangers, only to be deleted by them and Deka Master. Kight Reidlich is voiced by Rikiya Koyama (小山 力也, Koyama Rikiya).
Danish politicians have called for closing the US consulate in Greenland over its role in undermining Danish sovereignty. Former Danish foreign minister Per Stig Møller said Trump's behaviour has destroyed the US relationship with Denmark and compared it to German demands on Polish territory in the 1930s. Former Danish European Commissioner Margrethe Vestager called Trump's threats an existential threat for NATO and Europe. Rasmus Jarlov stated in an interview that a US military invasion of Greenland would constitute a war, with Denmark and the US fighting each other. Former Danish prime minister and NATO secretary general Anders Fogh Rasmussen said the US actions are widely seen as a betrayal in Denmark. Rasmussen emphasised that Greenland is not for sale, that Greenlanders don't want to become part of the US, and that the only way for the US to take it would be to invade the Kingdom of Denmark and destroy NATO. He said Denmark has no other choice than to defend its territory, and that non-resistance is not an option. He further said that Trump is "the biggest threat to world peace." He said Trump speaks like a gangster in his threats against Greenland. He also stated that time for "flattering Trump" was over while suggesting hard economic actions by Europe. He also suggested the establishment of a "European NATO" without the US.
==== Activation ==== Macrophages can achieve different activation phenotypes through interactions with different subsets of T helper cells, such as TH1 and TH2. Although there is a broad spectrum of macrophage activation phenotypes, there are two major phenotypes that are commonly acknowledged. They are the classically activated macrophages, or M1 macrophages, and the alternatively activated macrophages, or M2 macrophages. M1 macrophages are proinflammatory, while M2 macrophages are mostly anti-inflammatory.
Ptaquiloside is a norsesquiterpene glucoside produced by bracken ferns (majorly Pteridium aquilinum) during metabolism. It is identified to be the main carcinogen of the ferns and to be responsible for their biological effects, such as haemorrhagic disease and bright blindness in livestock and oesophageal, gastric cancer in humans. Ptaquiloside has an unstable chemical structure and acts as a DNA alkylating agent under physiological conditions. It was first isolated and characterized by Yamada and co-workers in 1983. The pure form ptaquiloside is a colorless amorphous compound. It is readily soluble in water and fairly soluble in ethyl acetate. Except in the plants, ptaquiloside has been detected in the milk and meat of affected livestock, as well as in the underground water and dry soil around bracken fern vegetation. The prevalence of ptaquiloside in daily sources along with its carcinogenic effects make it an increasing biological hazard in modern days.
Sources: en.wikipedia.org
== Religious figures == Samuel Provoost (1758), third Presiding Bishop of the American Episcopal Church John Beardsley (1761), Church of England clergyman in Canada; chaplain of the Loyal American Regiment Benjamin Moore (King's 1768), second bishop of the Episcopal Diocese of New York and president of Columbia College Philip Frederick Mayer (1799), Lutheran clergyman; founder of the Pennsylvania Bible Society, the first of its kind in the U.S. Henry Onderdonk (1805), second Episcopal bishop of Pennsylvania Jackson Kemper (1809), first missionary bishop of the Episcopal Church in the United States Benjamin Treadwell Onderdonk (1809), fourth bishop of the Episcopal Diocese of New York Richard Fish Cadle (1813), Episcopalian priest and first superior of Nashotah House Manton Eastburn (1817), fourth bishop of the Episcopal Diocese of Massachusetts Henry John Whitehouse (1821), second bishop of the Episcopal Diocese of Chicago George Washington Bethune* (1823), theologian and preacher John Chester Backus* (1830), Presbyterian minister Morgan Dix (1848), priest, theologian, rector of Trinity Church William Edmond Armitage (1849), second bishop of the Episcopal Diocese of Milwaukee George Franklin Seymour (1850), first bishop of the Episcopal Diocese of Springfield James DeKoven (1851), leader of the Anglo-Catholic movement in the Episcopal Church Marvin Vincent (1854), Presbyterian minister and professor at the Union Theological Seminary in the City of New York Daniel S.
Biologic debridement has the added benefit of being bactericidal since larvae will ingest bacteria as well as devitalized tissue. Despite the safety and effectiveness of this method, its applications are often limited due to patient's negative feelings towards larvae which are commonly associated with poor hygiene and perishable food.
== Operations == As of 2025, KEZAD Group’s infrastructure and services span 12 economic zones across Abu Dhabi, Al Ain and Al Dhafra Region, as well as an industrial and logistics zone in East Port Said, Egypt, covering a total area of 570 sq km. KEZAD Group’s platform supports over 2,300 businesses across 17 economic sectors, including logistics, automotive, food and beverages, pharmaceuticals, metals, chemicals, packaging, and clean energy industries.
Aggregate widths can be determined by CP/MAS NMR developed by Innventia AB, Sweden, which also has been demonstrated to work for nanocellulose (enzymatic pre-treatment). An average width of 17 nm has been measured with the NMR-method, which corresponds well with SEM and TEM. Using TEM, values of 15 nm have been reported for nanocellulose from carboxymethylated pulp. However, thinner fibrils can also be detected. Wågberg et al. reported fibril widths of 5–15 nm for a nanocellulose with a charge density of about 0.5 meq./g. The group of Isogai reported fibril widths of 3–5 nm for TEMPO-oxidized cellulose having a charge density of 1.5 meq./g. Pulp chemistry has a significant influence on nanocellulose microstructure. Carboxymethylation increases the numbers of charged groups on the fibril surfaces, making the fibrils easier to liberate and results in smaller and more uniform fibril widths (5–15 nm) compared to enzymatically pre-treated nanocellulose, where the fibril widths were 10–30 nm.
The growing academic interest in well-being is also reflected in the political sphere, challenging the gross domestic product as the main indicator of national success. As a result, indices to track, compare, and promote the well-being of populations have been established at both national and international levels. Examples include the World Happiness Report, the OECD Better Life Index, Bhutan's Gross National Happiness, and the UK Measures of National Well-being. Following this trend, policymakers are relying on well-being metrics and related factors to inform their decision-making processes. For instance, they may use the WELLBY scale to quantify how policy decisions influence the well-being of large populations. The study of well-being also affects the field of law, where considerations about how to protect and promote well-being can influence legislation. Sociologists examine the relation between well-being and social phenomena, such as race, socioeconomic status, and education. They use both subjective and objective metrics, with some studies dedicated to well-being in general, while others focus on specific domains, such as work, family, and housing, or on particular demographic groups, such as employees or the elderly. Anthropologists are interested in the concept of well-being in different cultures. They seek to understand what people at different times and places associate with a good life, such as the culture-specific norms, values, and practices for achieving personal well-being.
Sources: en.wikipedia.org
Initially, Macleod and Banting were particularly reluctant to patent their process for insulin on grounds of medical ethics. However, concerns remained that a private third-party would hijack and monopolize the research (as Eli Lilly and Company had hinted), and that safe distribution would be difficult to guarantee without capacity for quality control. To this end, Edward Calvin Kendall gave valuable advice. He had isolated thyroxin at the Mayo Clinic in 1914 and patented the process through an arrangement between himself, the brothers Mayo, and the University of Minnesota, transferring the patent to the public university. On 12 April, Banting, Best, Collip, Macleod, and FitzGerald wrote jointly to the president of the University of Toronto to propose a similar arrangement with the aim of assigning a patent to the Board of Governors of the university. The letter emphasized that:The patent would not be used for any other purpose than to prevent the taking out of a patent by other persons. When the details of the method of preparation are published anyone would be free to prepare the extract, but no one could secure a profitable monopoly.The assignment to the University of Toronto Board of Governors was completed on 15 January 1923, for the token payment of $1.00. The arrangement was congratulated in The World's Work in 1923 as "a step forward in medical ethics". It has also received much media attention in the 2010s regarding the issue of healthcare and drug affordability.
==== Systemic criminality ==== It is often said that all or most users sustain their addiction via crime, however academic Mark Hunter shows that the majority work for extremely low pay, often for other poor people.
Compactituberculate - The dome-shaped tops of the shell units form a dense covering of nodes on the surface of the eggshell. This type of ornamentation is most commonly seen in megaloolithids. Sagenotuberculate - The nodes and ridges form a netlike pattern interspersed with pits and grooves. Dispersituberculate - Scattered nodes. This ornamentation is seen on the poles of elongated eggs, which may have allowed accumulations CO2 at the poles to escape between the nodes. Lineartuberculate - Ridges, and chains of ridges and nodes form lines parallel to the long axis of the egg. Ramotuberculate - Irregular chains of nodes, typically found as a transition between the lineartuberculate midsection and dispersituberculate ends of elongated eggs. Anastomotuberculate - Ridges similar to lineartuberculate, but instead form wavy, branching, or anastomosing patterns resembling the water ripple marks in sand.
As a result of the Sino-Soviet split, tensions along the Chinese–Soviet border reached their peak in 1969, when the Soviet planned to launch a large-scale nuclear strike against China. United States President Richard Nixon intervened, and decided to use the conflict to shift the balance of power towards the West in the Cold War through a policy of rapproachment with China, which began with his 1972 visit to China and culminated in 1979 with the signing of the Joint Communiqué on the Establishment of Diplomatic Relations by President Carter and Chinese Communist Party leader Deng Xiaoping.
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.
The most common approach combines reverse-phase liquid chromatography with mass spectrometry. Chromatography separates the components while mass spectrometry confirms the molecular mass. Peptide sequencing or tandem mass analysis can further verify the amino acid order.