heptapeptide raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, with mass spectrometry used to confirm molecular mass and sequence information. Amino acid analysis and peptide mapping may supplement these methods. Certified reference standards are scarce, and many commercial lots are sold as research chemicals without a pharmacopoeial monograph. Regulatory treatment differs by country: Selank is a registered prescription medicine in Russia, while in the European Union and the United States it is not an approved drug and may fall under research-chemical or unapproved-product frameworks.
Selank is a hydrophilic peptide and dissolves readily in water and in aqueous buffers. The lyophilised powder is typically a white to off-white solid. Because short peptides are prone to hydrolysis and oxidation, handling benefits from limiting exposure to heat, moisture and strong light. Working solutions are commonly prepared in sterile water or saline, and repeated freeze-thaw cycles are avoided to reduce aggregation and loss of activity. These practices reflect general laboratory convention rather than published stability specifications.
Dry powder is normally held at -20 degrees Celsius or lower, in a sealed container with desiccant and protection from light. Reconstituted solutions are usually kept at 2 to 8 degrees Celsius for short periods and frozen for longer ones. Proline residues at several positions are generally associated with some resistance to peptidase attack, but chemical stability still declines at neutral to alkaline pH and at elevated temperature. Exact shelf-life figures are product-specific and are not standardised across suppliers.
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.
Selank is a synthetic heptapeptide developed in Russia during the 1990s. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences designed it as a stabilized analog of tuftsin, a naturally occurring immunomodulatory tetrapeptide. The compound has been studied primarily for its reported anxiolytic and nootropic effects. It remains largely unknown in Western pharmacology and is not approved as a medicine by major regulators such as the FDA or the EMA.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised solid form |
| Solubility class | Freely soluble in water | Hydrophilic heptapeptide |
| Dry storage temperature | -20 degrees Celsius or lower | Sealed, desiccated, protected from light |
| Solution storage | 2 to 8 degrees Celsius short term | Avoid repeated freeze-thaw cycles |
| Common identification method | Reversed-phase HPLC with mass spectrometry | Confirms purity and molecular mass |
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.
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.
Reported activity for Selank centers on anxiolytic and nootropic effects. Russian clinical reports describe use in anxiety and in cognitive or attention-related complaints. Most of this evidence comes from studies conducted by the same research groups that developed the peptide. Independent replication in other countries remains limited, and no major Western regulatory agency has approved the compound for any indication. The gap between local reports and external verification is a recurring point in discussions of the peptide.
absorption 1. The physical or chemical process by which a substance in one state becomes incorporated into and retained by another substance of a different state. Absorption differs from adsorption in that the first substance permeates the entire bulk of the second substance, rather than just adhering to the surface. 2. The process by which matter (typically electrons bound in atoms) takes up the energy of electromagnetic radiation and transforms it into any of various types of internal energy, such as thermal energy. This type of absorption is the principle on which spectrophotometry is based.
Lately First UK Offshore Wind Champion and Chair, Offshore Wind Acceleration Taskforce. For services to Offshore Wind Energy. Ruth Beatrice Pitter. Member, Anchor Society and Member, Stand Against Racism and Inequality. For services to Equality, to Charity and to the community in Bristol. Andrew Geoffrey Pollock. Founder, CLEVR Money. For services to Financial Inclusion. Phillip George Potter. Regional Lead, West Midlands, Wales and South West, UK Export Finance. For services to Business and to the community in Worcestershire. Jeffrey Richard Powell. Sports Writer and Columnist, Daily Mail. For services to Journalism and to Sport. Patricia Mary Pritchard. For services to Childcare and Early Years. Dr. Heidi Probst. Researcher, Lecturer and lately Director, Health Research Institute, Sheffield Hallam University. For services to Radiography. Howard John Provis. For services to the Welsh Blood Transfusion Service and to the community in Barry and the Vale of Glamorgan. Brian Thomas James Purcell. Lately Northern District Manager, St John Ambulance. For voluntary service in Northern Ireland. Anthony Martin Quinn. Lately Business Development Director, Co-operation Ireland. For services to Community Relations in Northern Ireland. Jayshree Rajkotia. Trustee and Vice Chair, Bharatiya Vidhya Bhavan, Institute of Indian Art and Culture. For services to Indian Culture. Melinda Elizabeth Raker, DL. Founder and Patron, The YANA Charity. For services to Rural Mental Health and Wellbeing. Laura-Jane Rawlings. Chief Executive Officer, Youth Employment UK. For services to Young People.
=== Author === While known within the fandom for his spoken storytelling, Conway is also the author of several short stories published in various works by Sofawolf Press. In May 1998, Conway was invited to write a story based on his interest in birds of prey, particularly the red-tailed hawk. The result was "Tweaked in the Head", published December 1999 in Flights of Fantasy. He next contributed to the first issue of HistoriMorphs, a fanzine mixing historical fiction with interaction between humans and anthropomorphic animals. "The Secret of Wollknäul" took place in Nazi Germany at the end of World War II, and was published in June 2001. He went on to write "The Good Bird of Nanking" and "It Takes A Fox" for subsequent issues of the series. For Anthrolations #5—a magazine of dramatic fiction—Conway submitted "Six", a previously-written work "based on a true story" involving wildlife rehabilitation from his days as a Red Cross volunteer. The story, illustrated by Synnabar, was nominated for "Best Anthropomorphic Short Story" in the 2002 Ursa Major Awards. Also nominated that year was Breaking the Ice: Stories from New Tibet, a collection set in and around a subarctic mining colony; Conway's contribution, "Dead End", features a bartending vulture who provides an introduction to the harsh, dystopic world.
Conversely, the catabolic effect was much less in an older male, and no such effect was observed in adult females consuming a diet with sufficient calories and protein. The catabolic effects of CPA were found to be greater than those of corticosteroids. Although higher doses of CPA are necessary for considerable systemic AR antagonistic activity, it is notable that even low doses of oral CPA appear to be able to significantly antagonize AR signaling in the liver in women. This may be related to the hepatic first-pass effect of oral administration, and is evidenced by the fact that whereas combined birth control pills containing CPA increase SHBG levels by 300 to 400%, combined birth control pills containing various other progestins, with either androgenic or antiandrogenic activity, increase SHBG levels by only 50 to 300%. This is relevant as estrogens stimulate hepatic SHBG production while androgens inhibit hepatic SHBG production, and vice versa for their antagonists. The antiandrogenic activity of CPA may also be responsible for the relatively greater risk of venous thromboembolism with CPA-containing birth control pills compared to those containing other progestins. In rats, a dosage of CPA of 25 mg/kg/day results in complete regression of prostate gland growth in gonadally intact males. The equivalent dosage in humans, on the basis of body surface (conversion factor from rat to human of 6), was estimated to be approximately 4 mg/kg/day, or around 300 mg/day CPA for a 75 kg (165 lb) man.
=== Articles === Wadden, TA; Stunkard, AJ (1985). "The psychological and social consequences of obesity". Annals of Internal Medicine. 103 (6 ( Pt 2)): 1062–1067. doi:10.7326/0003-4819-103-6-1062. PMID 4062126. Wadden, TA; Bailey, TS; Billings, LK (2021). "Effect of Subcutaneous Semaglutide vs Placebo as an Adjunct to Intensive Behavioral Therapy on Body Weight in Adults With Overweight or Obesity: The STEP 3 Randomized Clinical Trial". JAMA. 325 (14): 1403–1413. doi:10.1001/jama.2021.1831. PMC 7905697. PMID 33625476. Wadden, TA; Berkowitz, RI; Womble, LG (2005). "Randomized trial of lifestyle modification and pharmacotherapy for obesity". The New England Journal of Medicine. 353 (20): 2111–2120. doi:10.1056/NEJMoa050156. PMID 16291981. Wadden, TA; Webb, VL; Moran, CH; Bailer, BA (2012). "Lifestyle modification for obesity: new developments in diet, physical activity, and behavior therapy". Circulation. 125 (9): 1157–1170. doi:10.1161/CIRCULATIONAHA.111.039453. PMC 3313649. PMID 22392863. Heymsfield, SB; Wadden, TA (2017). "Mechanisms, pathophysiology, and management of obesity". The New England Journal of Medicine. 376 (3): 254–266. doi:10.1056/NEJMra1514009. PMID 28099824. Wadden, Thomas A.; Tronieri, Jena S.; Butryn, Meghan L. (2020). "Lifestyle modification approaches for the treatment of obesity in adults". American Psychologist. 75 (2): 235–251. doi:10.1037/amp0000517. PMC 7027681. PMID 32052997.
Sources: en.wikipedia.org
=== Cancer === LRP1 is involved in tumorigenesis, and is proposed to be a tumor suppressor. Notably, LRP1 functions in clearing proteases such as plasmin, urokinase-type plasminogen activator, and metalloproteinases, which contributes to prevention of cancer invasion, while its absence is linked to increased cancer invasion. However, the exact mechanisms require further study, as other studies have shown that LRP1 may also promote cancer invasion. One possible mechanism for the inhibitory function of LRP1 in cancer involves the LRP1-dependent endocytosis of 2′-hydroxycinnamaldehyde (HCA), resulting in decreased pepsin levels and, consequently, tumor progression. Alternatively, LRP1 may regulate focal adhesion disassembly of cancer cells through the ERK and JNK pathways to aid invasion. Moreover, LRP1 interacts with PAI-1 to recruit mast cells (MCs) and induce their degranulation, resulting in the release of MC mediators, activation of an inflammatory response, and development of glioma.
Office for National Statistics data for the year up to June 2023 shows fewer UK births than deaths over a 12-month period for the first time since the 1970s, with 16,300 fewer births occurring, while net migration increased the population by 662,400 to an estimated 68,265,200. Housing and planning minister, Matthew Pennycook, is referred to the parliamentary commissioner for standards for not revealing his close relationship with the author of the Institute for Fiscal Studies paper which Labour ministers have used as evidence to support their introduction of 20% value-added tax (VAT) on private school fees. 9 October – The All England Club announces it will adopt electronic line calling from 2025, meaning line judges will disappear from the Wimbledon Championships. 10 October A new King Charles III heraldic Coat of Arms, alongside the new Lesser Arms, used by the UK government, both by artist Timothy Noad are officially unveiled. A further 65 women are reported to have contacted the BBC regarding sexual abuse by the late former Harrods owner Mohamed Al-Fayed. The Prince and Princess of Wales visit Southport, where they meet the families of the three children killed in the July stabbing. It is the Princess's first public engagement since her cancer treatment. A technical fault with the BBC Weather website and app leads to incorrect forecasts of hurricane winds in the UK and internationally, with one forecast predicting winds of 13,508 mph in London.
== Bibliography == Lorenz M. "Lorenz, Maegara "The Mystery of Akhenaton: Genetics or Aesthetics"". Heptune.com. Archived from the original on February 8, 2010. Retrieved March 21, 2010. Montserrat D (2003) [2000]. Akhenaten: History, Fantasy and Ancient Egypt (1st paperback ed.). London; New York: Routledge. ISBN 0415301866. Reeves N (2019) [2001]. Akhenaten: Egypt's False Prophet (Electronic ed.). London; New York: Thames & Hudson. ISBN 978-0-500-29469-7. LCCN 00108868.
=== Molecular biology === In addition to microarrays, biochips have been designed for two-dimensional electrophoresis, transcriptome analysis, and PCR amplification. Other applications include various electrophoresis and liquid chromatography applications for proteins and DNA, cell separation, in particular, blood cell separation, protein analysis, cell manipulation and analysis including cell viability analysis and microorganism capturing.
Because desmosine is most prevalent in mature elastin, it can be consistently located and measured in urine samples after elastin breakdown in the human body. Desmosine does not exist elsewhere within the body, nor can it be sourced from elsewhere outside the body, which isolates it as a key marker for elastin breakdown. Indeed, desmosine "has been studied as a marker of elastin breakdown in several chronic pulmonary conditions, including chronic obstructive pulmonary disease (COPD), cystic fibrosis, and chronic tobacco use." In one study, hyperoxic mice that formed alveoli as a result of lung maturation also showed drastic changes in collagen and elastin within the lungs, as well as a change in cross-linking. In another study, deceased patients with acute respiratory distress syndrome (ARDS) were reported to have higher concentrations of desmosine in their urine than those patients who survived ARDS, and higher concentrations of desmosine revealed that "more severe damage to the extracellular matrix occurred in the most critically ill [acute lung injury] patients." However, it has been argued in the same study that desmosine does "not correlate well with markers of disease severity," correlating only weakly with age.
Sources: en.wikipedia.org
=== Burn pits === A form of BO is starting to present in Iraq and Afghanistan veterans. It has been attributed to veterans being exposed to trash burn pits. Veterans present with shortness of breath and other asthma-like symptoms. The only way to diagnose this condition is by doing a lung biopsy as chest X-rays and CT scans come back as normal. The US government still denies that there is any correlation between burn pits and health problems, but has started an "Airborne Hazards and Open Burn Pit Registry" to begin tracking the health of veterans who were exposed to burn pits to see if there is a connection.
== Side effects == Rupatadine is a non-sedating antihistamine. However, as in other non sedating second-generation antihistamines, the most common side effects in controlled clinical studies were somnolence, headaches and fatigue.
===== Recreational drugs ===== The data on the use of marijuana during breastfeeding is limited; however, in part due to our lack of knowledge in this area, the CDC recommends against using marijuana or marijuana-containing products, including CBD, during breastfeeding. The main active ingredient in marijuana, tetrahydrocannabinol (THC), can be found in breastmilk anywhere from six days to more than six weeks after marijuana use. There is limited data on the long term effects of this exposure on the infant, however some studies have voiced concern regarding delayed motor development in infants exposed to THC.
=== Tactics === Wenger was inspired by Borussia Mönchengladbach as a child, and was later influenced by Total Football, a playing style developed by Rinus Michels at Ajax in the 1970s. He recollected the team as having "perfect players everywhere and that was the sort of football I wanted to be playing myself". At Monaco, he employed a 4–4–2 formation, though he did trial 4–3–3, akin to Michels'. Wenger is an advocate of 4–4–2 as "no other formation is as efficient in covering space", but used it sparingly in his final seasons.
== Redistricting == On July 9, 2025, the Texas state government announced that during a planned special session on July 21 of that year, it would tackle mid-decade redistricting. This had been pushed privately by the White House to help Republicans keep control of the House in 2026, and critics have labeled it a gerrymander. On August 20, 2025, the Texas House passed congressional maps that would target five Democratic-held seats. The vote was 88–52, a party-line vote. The new map changes the territory of Democratic representatives Marc Veasey, Vicente Gonzalez, Lloyd Doggett, Julie Johnson, and Al Green. On August 23, 2025, the Texas Senate passed the map with a vote 18–8. Governor Greg Abbott has signed the map into law, and therefore will be the active map used in the 2026 House elections in Texas. On November 18, 2025, a federal court blocked Texas from using its newly drawn congressional map in the 2026 midterms, ruling that the map is likely an unconstitutional "racial gerrymander". Three days later on November 21, Supreme Court Justice Samuel Alito granted the request by the state to pause the court's ruling that reverts the election back to using the maps drawn in 2021 until the full Supreme Court of the United States could make a decision. On December 4, the Supreme Court ruled that Texas can use the new map in the 2026 midterm elections, striking down the lower court's ruling.
Sources: en.wikipedia.org
Dry powder is normally held at -20 degrees Celsius or below in a sealed, light-protected container with desiccant. Brief room-temperature handling during weighing is generally tolerated. Storage instructions vary between suppliers, so the accompanying certificate of analysis should be followed.
Reversed-phase HPLC establishes purity, while mass spectrometry confirms the expected molecular mass. Sequence confirmation may use tandem mass spectrometry or peptide mapping. A certificate of analysis typically reports these results alongside the analytical method applied.
In Russia it is a registered medicine available by prescription. In many other countries it is not approved for human use and is supplied only as a research chemical. Import and possession rules differ by jurisdiction, and buyers are responsible for checking local requirements.
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.