Everything below concerns Selank. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-04-29. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Regulatory treatment varies by jurisdiction. In Russia the compound is a registered prescription product, while in the European Union and the United States it is generally handled as a research chemical without a marketing authorization. Suppliers therefore operate outside pharmaceutical oversight, and buyers rely on supplier documentation for purity and identity claims. Chain of custody and third-party testing are the main verification tools. Analysts note that the absence of a pharmacopoeial monograph for research-grade material limits standardization across vendors.
Purity assessment relies mainly on reverse-phase high-performance liquid chromatography with ultraviolet detection. Because the peptide lacks a strong chromophore, detection often uses backbone absorbance near 214 nm. Identity is confirmed by mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, comparing the measured mass against the expected value. Amino acid analysis can verify composition after acid hydrolysis. Diastereomer content and residual counterions are reported less often, although both can influence biological assays.
Lyophilized material is generally stable for extended periods when kept dry at or below minus twenty degrees Celsius. Working solutions are less stable, and common practice is to aliquot and freeze them so that repeated freeze-thaw cycles are avoided. Aqueous solutions are sensitive to pH extremes and to microbial growth, so short-term storage at refrigerator temperature is typical. Oxidation and hydrolysis are the principal degradation routes. Reconstitution with sterile water or a mild buffer is standard, and solutions should be protected from light.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Tuftsin analogue |
| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Single-letter form: TKPRPGP |
| Molecular formula | C33H57N11O9 | Calculated for the free peptide |
| Molecular weight | About 751.9 g/mol | Derived from the sequence |
| Appearance | White to off-white powder | Typical lyophilised form |
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.
Enzymatic stability motivates the extra three residues at the carboxyl end. Native tuftsin is cleaved quickly by circulating aminopeptidases and carboxypeptidases, which limits its duration of action and its usefulness as a tool compound. Extending the chain with proline-rich segments is a common design tactic because proline constrains the backbone and slows proteolysis. The same Pro-Gly-Pro motif appears in other Russian-developed peptides of the era. Whether the full seven-residue chain is required for activity, or whether it acts mainly as a prodrug releasing tuftsin, remains unresolved.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. Its four N-terminal residues reproduce tuftsin, a tetrapeptide fragment of the immunoglobulin heavy chain, while the C-terminal Pro-Gly-Pro extension is a synthetic addition. The peptide has a molecular mass near 752 daltons and carries a net positive charge at physiological pH because of the arginine and lysine side chains. Published indexes list it under the name Selank and the sequence abbreviation TKPRPGP. Solid-phase peptide synthesis is the standard production route for research quantities.
== Methods == Forensic chemists rely on a multitude of instruments to identify unknown substances found at a scene. Different methods can be used to determine the identity of the same substance, and it is up to the examiner to determine which method will produce the best results. Factors that forensic chemists might consider when performing an examination are the length of time a specific instrument will take to examine a substance and the destructive nature of that instrument. They prefer using nondestructive methods first, to preserve the evidence for further examination. Nondestructive techniques can also be used to narrow down the possibilities, making it more likely that the correct method will be used the first time when a destructive method is used.
==== Countries and cultures ==== Systematic differences affected the perception of mental health across countries. East Asian countries are heavily influenced by cultural beliefs, associating mental health issues with weakness. Confucian values, practiced in South Korea, express values of self-control and maintaining "face." This value discourages East Asian individuals from seeking help when experiencing psychological distress out of fear of shaming one's family. Being heavily underfunded, East Asia has increased mental health awareness by implementing public educational programs and introducing mental health services to children in schools. Varying across the country, Japan lacks proper hospitalization and limited local community services, while Singapore promotes general healthcare, reducing the stigma across cultures. In African nations, the stigmatization of mental health viewed through a cultural lens and the prioritization of physical health issues cause neglect of health services. Insufficient financial resources and an extensive shortage of specialized caretakers cause concern for individuals with mental health conditions. Diseases such as AIDS, malaria, and Ebola attract health services attention due to the population impact. In hopes of reducing the spread of diseases, psychological disorders remain unaddressed. African nations undergo systematic challenges such as policy gaps and inadequate resources with trained professionals. International organizations collaborate with African governments to implement public programs created by local communities.
=== Modern pharmacology === For most of the 19th century, drugs were not highly effective, leading Oliver Wendell Holmes Sr. to famously comment in 1842 that "if all medicines in the world were thrown into the sea, it would be all the better for mankind and all the worse for the fishes". During the First World War, Alexis Carrel and Henry Dakin developed the Carrel-Dakin method of treating wounds with an irrigation, Dakin's solution, a germicide which helped prevent gangrene. In the inter-war period, the first anti-bacterial agents such as the sulpha antibiotics were developed. The Second World War saw the introduction of widespread and effective antimicrobial therapy with the development and mass production of penicillin antibiotics, made possible by the pressures of the war and the collaboration of British scientists with the American pharmaceutical industry. Medicines commonly used by the late 1920s included aspirin, codeine, and morphine for pain; digitalis, nitroglycerin, and quinine for heart disorders, and insulin for diabetes. Other drugs included antitoxins, a few biological vaccines, and a few synthetic drugs. In the 1930s, antibiotics emerged: first sulfa drugs, then penicillin and other antibiotics. Drugs increasingly became "the center of medical practice". In the 1950s, other drugs emerged including corticosteroids for inflammation, rauvolfia alkaloids as tranquilizers and antihypertensives, antihistamines for nasal allergies, xanthines for asthma, and typical antipsychotics for psychosis. As of 2007, thousands of approved drugs have been developed.
== Partnerships == The company entered into a co-marketing and sales agreement with Thermo Fisher Scientific in November 2024 to promote the integration of Seer’s Proteograph system with Thermo Fisher’s Orbitrap mass spectrometers. In June 2025, Seer announced a collaboration with Korea University and major Korean cancer centers, including Seoul National University Hospital and Samsung Medical Center. The partnership will support a large-scale plasma proteomics study aimed at identifying blood-based biomarkers for cancers in young adults. The study will utilize Seer’s Proteograph platform and a mass spectrometer from Thermo Fisher Scientific to analyze over 20,000 plasma samples.
NIHFW conducts training program for healthcare professionals including in-service training. It also conducts the Foundation Training Program (FTP) for the newly joined Central Health Service (CHS) officers. NIHFW also conducts post-graduate education courses such as MD in Community Health Administration (CHA), Post-graduate Diploma in Health Administration (DHA), Post-graduate Diploma in Public Health Management (PGDPHM), Masters of Public Health (MPH) and Ph.D. Programme. NIHFW also hosts National Cold-Chain and Vaccine Management Resource Centre for capacity building of Cold-Chain technicians involved in Universal Immunization Programme (UIP).
Sources: en.wikipedia.org
==== F ==== Dried fig – is used in food products such as fig rolls. Traditional dried fruit – are types of dried fruits that are either sun-dried, such as raisins and dried figs, or dehydrated in wind tunnels and other dryers, such as dried plums (prunes), apricots, and peaches.
The eye is most sensitive to damage by UV in the lower UVC band at 265–275 nm. Radiation of this wavelength is almost absent from sunlight at the surface of the Earth but is emitted by artificial sources such as the electrical arcs employed in arc welding. Unprotected exposure to these sources can cause "welder's flash" or "arc eye" (photokeratitis) and can lead to cataracts, pterygium and pinguecula formation. To a lesser extent, UVB in sunlight from 310 to 280 nm also causes photokeratitis ("snow blindness"), and the cornea, the lens, and the retina can be damaged. Protective eyewear is beneficial to those exposed to ultraviolet radiation. Since light can reach the eyes from the sides, full-coverage eye protection is usually warranted if there is an increased risk of exposure, as in high-altitude mountaineering. Mountaineers are exposed to higher-than-ordinary levels of UV radiation, both because there is less atmospheric filtering and because of reflection from snow and ice. Ordinary, untreated eyeglasses give some protection. Most plastic lenses give more protection than glass lenses, because, as noted above, glass is transparent to UVA and the common acrylic plastic used for lenses is less so. Some plastic lens materials, such as polycarbonate, inherently block most UV.
=== Media === The Spectator opined that "In any discipline, we seek only to discover who is the fastest, or the strongest, the most accurate or the most coordinated. What's absolutely crucial, at least as far as retaining spectator interest goes, is that the advantage is natural." The Daily Telegraph's sports writer commented that "Remarkably it seems a more fleshed-out idea than the European Super League". Cyclist wondered who would be willing to sponsor the event, noting that as of late July 2023, no sponsors were mentioned on TEG's website. Writing for The Globe and Mail, Alex Cyr said, "I will admit, I am incredibly curious to see an 'enhanced' person running faster than Usain Bolt, or swimming better than Michael Phelps. But I would not want to be that person, and I bet that neither will the serious athletes who have so far managed to avoid doping infractions." The Independent said that while the sporting world has been mostly dismissive, "D'Souza is intelligent and well-connected, and he has brought down big targets before. So when he says it's going to happen, he is deadly serious." The Sydney Morning Herald's sport columnist said that "the Enhanced Games are a dangerous, iniquitous concept." Outsports criticized D'Souza's use of LGBTQ language like "coming out" to describe athletes openly using performance-enhancing drugs. D'Souza is an out gay man. OutKick's writer said in February 2025 "Humans LOVE modern gladiators accomplishing feats that none of us ever could. The Olympics can still have non-tainted records ...
== Adverse effects == Neonatal circumcision is generally a safe, low-risk procedure when done by an experienced practitioner. The most common acute complications are excessive bleeding, infection and the removal of either too much or too little foreskin. These complications occur in approximately 0.13% of procedures, with bleeding being the most common acute complication in the United States. Minor complications are reported to occur in approximately 3.8%. Severe complications are rare. A specific complication rate is difficult to determine due to inconsistencies in classification. Complication rates are greater when the procedure is performed by an inexperienced operator, in unsterile conditions, and older patient age. In patients circumcised after the neonatal period and into adolescence, minor complication rates rise from approximately 1.5% in neonates to about 6% in adolescents. This increase is believed to be a result of increased foreskin vascularity. Significant acute complications happen rarely, occurring in about 1 in 500 newborn procedures in the United States. Severe to catastrophic complications, including death, are so rare that they are reported only as individual case reports. Where a Plastibell device is used, the most common complication is the retention of the device occurring in around 3.5% of procedures. Other possible complications include buried penis, chordee, phimosis, skin bridges, urethral fistulas, and meatal stenosis. These complications may be partly avoided with proper technique, and are often treatable without requiring surgical revision.
Sources: en.wikipedia.org
The sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, commonly written as TKPRPGP. It shares the first four residues with tuftsin and carries three prolines in the chain. The proline-rich tail is the main structural feature that separates it from the parent tetrapeptide.
Selank is a synthetic analogue built on the tuftsin tetrapeptide Thr-Lys-Pro-Arg. Extra proline residues were added to the C-terminus during design work. That modification is intended to make the peptide less vulnerable to rapid enzymatic degradation.
Transliteration from Russian produces variant spellings such as Selanc. Many suppliers avoid the trade-style name entirely and list the peptide sequence. Comparing sequences rather than names is the reliable way to confirm two entries describe the same molecule.
Purity is usually reported as an HPLC area percentage, most often measured at 214 nm. Identity is confirmed separately by mass spectrometry. A certificate of analysis should state both the method and the observed value.