This is a working overview of Tuftsin analogue, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-08-28 and is reviewed periodically as new material appears.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Peptide sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Seven residues; tuftsin plus a Pro-Gly-Pro tail |
| Molecular formula | C33H57N11O9 | Commonly reported value for the free peptide |
| Monoisotopic mass | Roughly 751.4 Da | Average molecular mass near 751.9 Da |
| Appearance | White to off-white powder | Typically supplied as a lyophilized solid |
| Solubility class | Freely soluble in water | Also dissolves in saline and other polar solvents |
Handling follows standard practice for research peptides. Material is weighed in a low-humidity environment because the powder absorbs atmospheric moisture. Purity is reported as the percentage area of the main peak in a chromatogram, with specifications commonly set at 95 percent or higher; values below that threshold indicate the presence of truncated or modified species. Residual trifluoroacetate from purification is often present and may affect mass balance. Certificates of analysis should state the analytical method, the column and gradient used, and the lot-specific retention time so that results can be compared across suppliers.
Identity and purity of selank are established with reversed-phase high-performance liquid chromatography coupled to mass spectrometry. The peptide elutes from C18 columns with acetonitrile gradients in water containing trifluoroacetic acid or formic acid, and detection is usually performed by ultraviolet absorbance near 214 nm. Electrospray ionization in positive mode gives a doubly protonated ion near m/z 377, consistent with a mass of about 752 Da. Amino acid analysis or tandem mass spectrometry of fragment ions confirms the sequence. Because the molecule has no aromatic residues, it lacks a usable 280 nm chromophore, so low-wavelength detection or mass spectrometry is required.
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.
Cesium atoms was subsequently used to show that single atoms of an element could be counted if its resonance ionization was performed in a counter in which an electron could be detected for an atom in its ground state. Subsequently, advanced techniques categorized under resonance ionization mass spectrometry (RIMS) were used to generate the relative abundance of various ion types by coupling the RIS lasers to magnetic sector, quadrupole, or time-of-flight (TOF) mass spectrometers. The field of resonance ionization spectroscopy (RIS) has largely been shaped by the formal and informal communications heralding its discovery. Research papers on RIS have heavily relied on self-citation from inception, a trend which climaxed three years later with the founding of a company to commercialize the technique.
=== Repulsion forces === Because nuclei are all positively charged, they strongly repel one another. Normally, in the absence of a catalyst such as a muon, very high kinetic energies are required to overcome this charged repulsion. Extrapolating from known fusion rates, the rate for uncatalyzed fusion at room-temperature energy would be 50 orders of magnitude lower than needed to account for the reported excess heat. In muon-catalyzed fusion there are more fusions because the presence of the muon causes deuterium nuclei to be 207 times closer than in ordinary deuterium gas. But deuterium nuclei inside a palladium lattice are further apart than in deuterium gas, and there should be fewer fusion reactions, not more. Paneth and Peters in the 1920s already knew that palladium can absorb up to 900 times its own volume of hydrogen gas, storing it at several thousands of times the atmospheric pressure. This led them to believe that they could increase the nuclear fusion rate by simply loading palladium rods with hydrogen gas. Tandberg then tried the same experiment but used electrolysis to make palladium absorb more deuterium and force the deuterium further together inside the rods, thus anticipating the main elements of Fleischmann and Pons' experiment. They all hoped that pairs of hydrogen nuclei would fuse together to form helium, which at the time was needed in Germany to fill zeppelins, but no evidence of helium or of increased fusion rate was ever found.
Undeterred, Aditya returns to India and has Ajay's proxy killed with the excuse of self-defence and announces that they will display Ajay's corpse to the media. Vinod's accomplices, cornered and with no other options, turn against him; to save themselves, they have Ajay secretly returned to India and killed. At Ajay's wake, however, it is revealed Ajay is not Vinod's son but that of feared mafia boss Hariharan "Hari" Chopra, who is responsible for the massacre of 17 policemen in Mumbai. While in London, Hari learns of Ajay's murder. Vowing revenge, he secretly enters India via the Bangladesh–India border. Fearing for his life, Vinod contacts Aditya's daughter, Valli, and warns her that Aditya is in danger. Hari later stabs Vinod for his inability to protect Ajay, targets Aditya and Valli, and arranges a gruesome car accident. Aditya survives the attack, but Valli is diagnosed with a subdural hematoma, and her doctor tells her she has only two hours to live. Valli records a video for Aditya and dies. In his grief over her death, Aditya turns violent. Believing Vinod to be responsible for the car accident, Aditya barges into his residence but learns of his murder. Enraged and confused, Aditya sets out to discover the truth behind Valli's death and kills numerous gangsters in the process. Present: Hari's goons ambush Aditya and his subordinates. Although they survive the attack, they suspend Aditya for his rash behaviour. About to give up, he discovers Valli's video, in which she reveals Vinod's earlier warning and encourages Aditya to persevere with his investigation.
=== Predators === This species is preyed upon by jumping spiders of the Salticidae family. Some of these spiders simply leap into the webs of their prey and attack them. Others employ a certain strategy known as mimicry in order to trick P. phalangioides and capture them. A jumping spider whose aggressive mimicry behavior towards P. phalangioides has been well studied is the species Portia fimbriata. During mimicry, the jumping spider produces certain specialized vibrations near the edge of the webs of P. phalangioides. These vibrations cause the webs of P. phalangioides to oscillate in such a way that they mimic the oscillations that would be produced when a form of prey gets stuck in the web. The jumping spider will then continue on with these vibrations for very long durations of time, up to three days in some instances. P. phalangioides often assume that this is an indication that they have caught some sort of prey and will move toward the host of the vibrations. At this point, the jumping spider is in an optimal position to leap onto and attack P. phalangioides, thus subduing them in many instances. In addition to employing mimicry, these jumping spiders are also particularly good at preventing P. phalangioides from inducing their whirling defense mechanism, which tends to be an effective way for P. phalangioides spiders to defend themselves from predators.
Sources: en.wikipedia.org
==== Long-term antiviral immunity ==== After viral infection in rodents, type I IFNs promote SeV clearance and speed up the migration and maturation of dendritic cells. However, soon after viral infection, animals efficiently generate cytotoxic T cells independently of type I IFN signaling and clear the virus from their lungs. Moreover, even the animals that are unresponsive to type I IFN develop long-term anti-SeV immunity in a form of memory response that includes generation of CD8+ T cells and neutralizing antibodies. This memory response can protect animals against further challenge with a lethal dose of virus.
The environment of the migrating cell can affect its speed, persistence and direction of migration by stimulating it. The extracellular matrix (ECM) provides not only the structural and biochemical support, but also plays a major role in regulating cell behavior. Different ECM proteins (such as collagen, elastin, fibronectin, laminin, and others) allow cells to adhere and migrate, while forming focal adhesions in the front and disassembling them in the back. Using these adhesion sites, cells also sense the mechanical properties of the ECM. Cells can be guided by a gradient of those proteins (haptotaxis) or a gradient of soluble substrates in the liquid phase surrounding the cell (chemotaxis). Cells sense the substrate through their receptors and migrate toward the concentration (or the opposite direction). Another form of stimulation can be rigidity gradients of the ECM (durotaxis).
=== Firestone recall and legal mandates === The Firestone recall in the late 1990s (which was linked to more than 100 deaths from rollovers following tire tread-separation), pushed the United States Congress to legislate the TREAD Act. The Act mandated the use of a suitable TPMS technology in all light motor vehicles (under 10,000 lb (4,500 kg)), to help alert drivers of under-inflation events. This act affects all U.S. light motor vehicles sold after September 1, 2007. Phase-in started in October 2005 at 20%, and reached 100% for models produced after September 2007. In the United States, as of 2008 and the European Union, as of November 1, 2012, all new passenger car models (M1) released must be equipped with a TPMS. From November 1, 2014, all new passenger cars sold in the European Union must be equipped with a TPMS. For N1 vehicles (trucks up to 3.5 tonnes), TPMS are not mandatory, but if a TPMS is fitted, it must comply with the regulation. On July 13, 2010, the South Korean Ministry of Land, Transport and Maritime Affairs announced a pending partial-revision to the Korea Motor Vehicle Safety Standards (KMVSS), specifying that "TPMS shall be installed to passenger vehicles and vehicles of GVW 3.5 tons or less, ... [effective] on January 1, 2013 for new models and on June 30, 2014 for existing models". Japan is expected to adopt European Union legislation approximately one year after European Union implementation. Further countries to make TPMS mandatory include Russia, Indonesia, the Philippines, Israel, Malaysia and Turkey.
While a majority of young Americans of the late 2010s held politically left-leaning views, Generation Z has been shifting towards the right since 2020. But most members of Generation Z are more interested in advancing their careers than pursuing idealistic political causes. Moreover, there is a significant sex gap, with implications for families, politics, and society at large. As voters, members Generation Z do not align themselves closely with either major political parties; their top issue is the economy. As consumers, Generation Z's actual purchases do not reflect their environmental ideals. Members of Generation Z, especially women, are also less likely to be religious than older cohorts. Although American youth culture has become highly fragmented by the start of the early twenty-first century, a product of growing individualism, nostalgia is a major feature of youth culture in the 2010s and 2020s.
== Role of the clinical data manager in a clinical trial == Job profile acceptable in CDM: clinical researcher, clinical research associate, clinical research coordinator etc. The clinical data manager plays a key role in the setup and conduct of a clinical trial. The data collected during a clinical trial form the basis of subsequent safety and efficacy analysis which in turn drive decision making on product development in the pharmaceutical industry. The clinical data manager is involved in early discussions about data collection options and then oversees development of data collection tools based on the clinical trial protocol. Once subject enrollment begins, the data manager ensures that data are collected, validated, complete, and consistent. The clinical data manager liaises with other data providers (e.g. a central laboratory processing blood samples collected) and ensures that such data are transmitted securely and are consistent with other data collected in the clinical trial. At the completion of the clinical trial, the clinical data manager ensures that all data expected to be captured have been accounted for and that all data management activities are complete. At this stage, the data are declared final (terminology varies, but common descriptions are "Database Lock", “Data Lock” and "Database Freeze"), and the clinical data manager transfers data for statistical analysis.
Sources: en.wikipedia.org
Plasma desorption ionization mass spectrometry (PDMS), also called fission fragment ionization, is a mass spectrometry technique in which ionization of material in a solid sample is accomplished by bombarding it with ionic or neutral atoms formed as a result of the nuclear fission of a suitable nuclide, typically the californium isotope 252Cf.
== Medical uses == In the EU, migalastat is indicated for the long-term treatment of people aged 16 years of age and older with a confirmed diagnosis of Fabry disease (alpha-galactosidase A deficiency) and who have an amenable mutation. In the US, migalastat is indicated for the treatment of adults with a confirmed diagnosis of Fabry disease and an amenable galactosidase alpha gene (GLA) variant based on in vitro assay data. An "amenable" mutation is one that leads to misfolding of the enzyme, but otherwise would not significantly impair its function. Based on an in vitro test, Amicus Therapeutics has published a list of 269 amenable and nearly 600 non-amenable mutations. About 35 to 50% of people with Fabry have an amenable mutation.
A permanent routine of exercise, eating healthily, and, during periods of being overweight, consuming the same number or fewer calories than used will prevent and help fight obesity. A single pound of fat yields approximately 3500 calories of energy (32 000 kJ energy per kilogram of fat), and weight loss is achieved by reducing energy intake, or increasing energy expenditure, thus achieving a negative balance. Adjunctive therapies which may be prescribed by a physician are orlistat or sibutramine, although the latter has been associated with increased cardiovascular events and strokes and has been withdrawn from the market in the US, the UK, the EU, Australia, Canada, Hong Kong, and Thailand. A 2006 study published in the International Journal of Sport Nutrition and Exercise Metabolism suggests that combining cardiovascular (aerobic) exercise with resistance training is more effective than cardiovascular training alone in getting rid of abdominal fat. An additional benefit to exercising is that it reduces stress and insulin levels, which reduce the presence of cortisol, a hormone that leads to more belly fat deposits and leptin resistance. Age-related increases in central adiposity are strongly linked to a progressive decline in basal metabolic rate and loss of lean body mass in adult males. To effectively reduce visceral fat and maintain metabolic health, structured physical activity combining both aerobic and resistance training is recommended.
=== Wet chemistry === The most common methods for nanoparticle synthesis fall under the category of wet chemistry, or the nucleation of particles within a solution. This nucleation occurs when a silver ion complex, usually AgNO3 or AgClO4, is reduced to colloidal Ag in the presence of a reducing agent. When the concentration increases enough, dissolved metallic silver ions bind together to form a stable surface. The surface is energetically unfavorable when the cluster is small, because the energy gained by decreasing the concentration of dissolved particles is not as high as the energy lost from creating a new surface. When the cluster reaches a certain size, known as the critical radius, it becomes energetically favorable, and thus stable enough to continue to grow. This nucleus then remains in the system and grows as more silver atoms diffuse through the solution and attach to the surface When the dissolved concentration of atomic silver decreases enough, it is no longer possible for enough atoms to bind together to form a stable nucleus. At this nucleation threshold, new nanoparticles stop being formed, and the remaining dissolved silver is absorbed by diffusion into the growing nanoparticles in the solution. As the particles grow, other molecules in the solution diffuse and attach to the surface. This process stabilizes the surface energy of the particle and blocks new silver ions from reaching the surface. The attachment of these capping/stabilizing agents slows and eventually stops the growth of the particle.
Prakash and Kamal Hinduja, as well as their son Ajay and his wife Namrata, who are members of Britain's richest family, are convicted and sent to prison for exploiting staff brought from India to work in their Geneva villa. 22 June Thousands of people join the "Restore Nature Now" march through central London to Parliament Square, demanding action on the UK's declining wildlife. The UK Health Security Agency (UKHSA) and Met Office issue a yellow heat health alert for most of England, to come into force from the morning of Monday 24 June and remain in place until the afternoon of Thursday 27 June. Following criticism from other party leaders over his comments about Putin, Nigel Farage pens an op-ed in The Telegraph in which he says he has never been an "apologist or supporter" of Putin, but that "if you poke the Russian bear with a stick, don't be surprised if he responds". 23 June Flights from Manchester Airport's Terminals 1 and 2 are cancelled following a "major" power cut. 2024 United Kingdom general election date betting controversy: The Sunday Times reports that Nick Mason, the Conservative Party's chief data officer, has become the fourth person to face investigation by the Gambling Commission for betting on the date of the election. BBC News reports that the Gambling Commission's investigation involves more people than those already named. 24 June Princess Anne is taken to hospital with a head injury thought to have been caused by a horse. The UK records its hottest temperature of 2024 so far, with 28.3 °C recorded at Wisley in Surrey.
Sources: en.wikipedia.org
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.
No peptide with this exact sequence has been identified as an endogenous substance. It is a laboratory-designed analog of tuftsin, a naturally occurring immunomodulatory tetrapeptide. The Pro-Gly-Pro extension has no known natural source.
Proline introduces conformational constraints that make a peptide less accessible to common peptidases. This is a standard stabilization strategy in peptide design. The added residues also increase the distance between the active tuftsin portion and typical cleavage sites.
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.