tuftsin is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-12-02. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Typical purity report | 95% or higher by HPLC | Area percentage at 214 nm |
| Identity confirmation | Mass spectrometry | Electrospray or MALDI |
| Powder storage | -20 C, desiccated | Protect from light |
| Solution storage | 2-8 C short term | Freeze aliquots for longer |
| Quality document | Certificate of analysis | States method and value |
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.
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.
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.
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.
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.
This reaction is strongly exothermic, so the equilibrium constant decreases with temperature. However, a temperature of around 400 °C is required in order to achieve a reasonable rate of reaction with currently available catalysts. Formation of ammonia is also favoured by high pressure, as the volume decreases when the reaction takes place. The same reaction, nitrogen fixation, occurs at ambient temperatures in nature, when the catalyst is an enzyme such as nitrogenase. Much energy is needed initially to break the nitrogen–nitrogen triple bond even though the overall reaction is exothermic. Gas-phase equilibria occur during combustion and were studied as early as 1943 in connection with the development of the V2 rocket engine. The calculation of composition for a gaseous equilibrium at constant pressure is often carried out using ΔG values, rather than equilibrium constants.
The RFamide peptide family, or the RFamide-related peptides (RFRPs), are a family of neuropeptides. They are characterized by the possession of an Arg-Phe-NH2 motif at their C-terminal extremities. Members of the family include:
Sierra View Medical Center is a 167-bed, full-service acute care hospital located in Porterville, California. Founded in 1958, the hospital serves the Southern Sequoia region of California's Central Valley. Services include cancer care, an intensive-care unit and respiratory care. The hospital is a part of the Sierra View Local Healthcare District. It offers a wide range of health care services featuring state of the art technologies including Magnetic Resonance Imaging (MRI) and Computed Tomography (CT). The hospital is also home to the Roger S. Good Cancer Treatment Center, which hosts clinical trials of the University of California Los Angeles in oncology. In July 2007, the hospital opened a 32-station outpatient Dialysis Center. The hospital's Wound Healing Center is managed by Healogics. Sierra View Medical Center was awarded the Joint Commission's Gold Seal of Approval for Primary Stroke Centers in 2021, demonstrating compliance with high standards in quality improvement for patient outcomes. The hospital also received the organization's Pioneers in Quality award in 2017. Sierra View Medical Center received the Get With The Guidelines - Stroke GOLD PLUS with Target: Type 2 Diabetes Honor Roll from the American Heart Association. It is also the only hospital in Tulare County to be designated "Baby Friendly" following a World Health Organization and UNICEF-supported initiative aimed at promoting breastfeeding. The Wound Healing Center was awarded the Healogics Robert A. Warriner III Center of Excellence in 2018.
Sources: en.wikipedia.org
=== Selected books === Diagnosis and Management of Renal Disease and Hypertension (1988) ISBN 9780812111293 Immunohistology in Diagnostic Pathology (1989) ISBN 9780849349874 Non-neoplastic Kidney Diseases (2005) ISBN 9781881041962 Primer on Kidney Diseases (2009) ISBN 9781416051855 Fundamentals of Renal Pathology (2013) ISBN 9783642390791 Heptinstall's Pathology of the Kidney (2024) ISBN 9781975161538
This being the reason for seeing mass decay between 660 °C and 710 °C. Differences in differential thermogram (DTG) peaks for TLW were compared to TSW. TLW had four distinctive peaks at 87, 195, 265, and 306 °C whereas TSW had two major drop offs at 200 and 306 °C with one spike in between. The four peaks indicated that TLW contains more diverse types of additives than TSW. The residual mass percentage between TLW and TSW was further compared, where the residual mass in TSW was less than that of TLW for both CO2 and N2 environments concluding that TSW has higher quantities of additives than TLW.
=== Example: Azathioprine Therapy === Azathioprine is an immunomodulator for inflammatory bowel disease, for instance. Its metabolite relies on two different enzymes (TPMT and NUDT15) to eliminate its effect on our body during its metabolism. If the patient has the phenotype of the enzymes that metabolize it poorly, i.e., the poor metabolizer, more toxic metabolites are accumulated in the body. Thus, the patient has a greater risk of the related side-effect. The side effect causes the adjustment of dosage or switching to another drug.
Income inequality has traditionally been low in Denmark. According to OECD figures, in 2000 Denmark had the lowest Gini coefficient of all countries. However, inequality has increased during the last decades. According to data from Statistics Denmark, the Gini coefficient for disposable income has increased from 22.1 in 1987 to 29.3 in 2017. The Danish Economic Council found in an analysis from 2016 that the increasing inequality in Denmark is due to several components: Pre-tax labour income is more unequally distributed today than before, capital income, which is generally less equally distributed than labour income, has increased as share of total income, and economic policy is less redistributive today, both because public income transfers play a smaller role today and because the tax system has become less progressive. In international comparisons, Denmark has a relatively equal income distribution. According to the CIA World Factbook, Denmark had the twentieth-lowest Gini coefficient (29.0) of 158 countries in 2016. According to data from Eurostat, Denmark was the EU country with the seventh-lowest Gini coefficient in 2017. Slovakia, Slovenia, Czechia, Finland, Belgium and the Netherlands had a lower Gini coefficient for disposable income than Denmark.
Sources: en.wikipedia.org
The first suborbital spacecraft weighed 3,000 pounds (1,400 kg); the heaviest, Mercury-Atlas 9, weighed 3,000 pounds (1,400 kg) fully loaded. On reentry, the astronaut would stay in the craft through splashdown by parachute in the Atlantic Ocean.
Pakistan's economy ranks 27th globally by purchasing power parity (PPP) and 42nd by nominal GDP. Historically, Pakistan was part of the wealthiest region in the first millennium CE, but lost ground to regions like China and Western Europe by the 18th century. Pakistan is a developing country, and part of the Next Eleven, poised to become one of the world's largest economies in the 21st century, alongside the BRIC countries. The semi-industrialised economy is heavily dependent on agriculture, and industrial growth in Pakistan benefits significantly from agricultural expansion. Pakistan's economy has shifted from agriculture to trade and services, with agriculture contributing about one-fifth of GDP and manufacturing one-sixth, while trade and services form the largest share. In 2023, Pakistan was the 66th-largest export economy, with a trade deficit of US$21.3 billion.
Aildenafil (methisosildenafil) is a synthetic drug that is a structural analog of sildenafil (Viagra). It was first reported in 2003. Like sildenafil, aildenafil is a phosphodiesterase type 5 inhibitor. Aildenafil has been found as an adulterant in a variety of supplements which are sold as "natural" or "herbal" sexual enhancement products. The United States Food and Drug Administration has warned consumers that any sexual enhancement product that claims to work as well as prescription products is likely to contain such a contaminant. Aildenafil is approved for use in China.
The sulcular epithelium is a thin, non-keratinized epithelial lining that forms the smooth inner wall of the gingival sulcus, extending from the gingival margin coronally to the dentogingival junction apically. The gingival sulcus normally measures 0.5–3 mm in healthy individuals; an increase beyond this range may indicate pseudopocket formation or periodontal disease. The sulcular epithelium primarily acts as the protective barrier against foreign substances while also playing a crucial immunological role due to its semi-permeable nature. Structural and functional changes in the sulcular epithelium are observed during the onset and progression of periodontal disease. In dental anatomy, the sulcular epithelium is that epithelium which lines the gingival sulcus. It is apically bounded by the junctional epithelium and meets the epithelium of the oral cavity at the height of the free gingival margin. The sulcular epithelium is nonkeratinized.
== External links == Tobacco Etch Virus (Pepper Diseases) Archived 2010-08-27 at the Wayback Machine Tobacco Etch Virus (Tomato Diseases) Archived 2011-07-16 at the Wayback Machine Tobacco Etch Virus (DAS-ELISA) Archived 2016-04-17 at the Wayback Machine ICTVdB - The Universal Virus Database: Tobacco etch virus Family Groups - The Baltimore Method Archived 2000-01-15 at the Wayback Machine Descriptions of Plant Viruses (DPV)
Sources: en.wikipedia.org
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.
Dry powder is kept frozen, desiccated, and shielded from light. Dissolved material is aliquoted and frozen to limit freeze-thaw cycles. Short-term refrigerated storage is common for working solutions.
Russia registers it as a prescription nasal product. Most other markets classify it as a research chemical with no approved medical use. Oversight of purity and labeling is consequently minimal in those markets.
Selank is a synthetic seven-amino-acid peptide modeled on tuftsin, a fragment of the immunoglobulin G heavy chain. It was designed in Russia to combine anxiolytic and immunomodulatory properties in one molecule.