nootropic comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-06-03. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Modeled on tuftsin |
| Amino acid sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Seven residues |
| Approximate molecular mass | Around 750 Da | Depends on counter-ion and hydration |
| Common forms | Lyophilized powder | Also described as aqueous solution |
| Primary origin of research | Russian laboratories | Mid-1990s onward |
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.
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.
=== Rare human diseases === Mutations in TERT have been implicated in predisposing patients to aplastic anemia, a disorder in which the bone marrow fails to produce blood cells, in 2005. Cri du chat syndrome (CdCS) is a complex disorder involving the loss of the distal portion of the short arm of chromosome 5. TERT is located in the deleted region, and loss of one copy of TERT has been suggested as a cause or contributing factor of this disease. Dyskeratosis congenita (DC) is a disease of the bone marrow that can be caused by some mutations in the telomerase subunits. In the DC cases, about 35% cases are X-linked-recessive on the DKC1 locus and 5% cases are autosomal dominant on the TERT and TERC loci. Patients with DC have severe bone marrow failure manifesting as abnormal skin pigmentation, leucoplakia (a white thickening of the oral mucosa) and nail dystrophy, as well as a variety of other symptoms. Individuals with either TERC or DKC1 mutations have shorter telomeres and defective telomerase activity in vitro versus other individuals of the same age. In one family autosomal dominant DC was linked to a heterozygous TERT mutation. These patients also exhibited an increased rate of telomere-shortening, and genetic anticipation (i.e., the DC phenotype worsened with each generation).
1942: Native American aerospace engineer Mary Golda Ross became employed at Lockheed Aircraft Corporation, where she provided troubleshooting for military aircraft. She went on to work for NASA, developing operational requirements, flight plans, and a Planetary Flight Handbook for spacecraft missions such as the Apollo program. 1943: British geologist Eileen Guppy was promoted to the rank of assistant geologist, therefore becoming the first female geology graduate appointed to the scientific staff of the British Geological Survey. 1943: American geologist and crystallographer Elizabeth A. Wood became the first female to be hired as a member of the technical staff (MTS) at Bell Telephone Laboratories in Murray Hill, New Jersey. 1944: Indian chemist Asima Chatterjee became the first Indian woman to receive a doctorate of science, completing her studies at the University of Calcutta. She went on to establish the Department of Chemistry at Lady Brabourne College. 1945: American physicists and mathematicians Frances Spence, Ruth Teitelbaum, Marlyn Meltzer, Betty Holberton, Jean Bartik and Kathleen Antonelli programmed the electronic general-purpose computer ENIAC, becoming some of the world's first computer programmers.
22 January – ScotRail announces another suspension of train services from 7pm the following day ahead of the arrival of Storm Jocelyn. 23 January – The Rail Accident Investigation Branch launches an investigation into a collision between a train and a fallen tree at 84 mph (135 kmh) at Broughty Ferry on the Dundee–Aberdeen line during Storm Gerrit in December 2023. 26 January – French Holocaust denier Vincent Reynouard, who spent two years on the run in Scotland before being apprehended by police in November 2022, loses his appeal against extradition to France, where he faces charges of inciting hatred and denying the occurrence of the Holocaust. 28 January – The Met Office records a provisional peak temperature of 19.6 °C (67.3 °F) at Kinlochewe in the Scottish Highlands, setting a new record for January temperatures in the area. 29 January – Edinburgh City Council implements a ban on pavement parking. Engineers begin four days of work to install netting above the railway at Ratho to prevent potential rockfall, causing disruption to Central Belt railway services while the work is carried out. Robert O'Brian and Andrew Kelly are to appeal against their sentences for the murder of Caroline Glachan. 31 January – The Scottish Government confirms it will introduce a ban on the sale and exchange of American XL bully dogs from 23 February, while a licence to own one will be required from 31 July.
== Chemistry == Anastrozole is a nonsteroidal benzyl triazole. It is also known as α,α,α',α'-tetramethyl-5-(1H-1,2,4-triazol-1-ylmethyl)-m-benzenediacetonitrile. Anastrozole is structurally related to letrozole, fadrozole, and vorozole, with all being classified as azoles.
MG132 is a potent, reversible, and cell-permeable proteasome inhibitor (Ki = 4 nM). It belongs to the class of synthetic peptide aldehydes. It reduces the degradation of ubiquitin-conjugated proteins in mammalian cells and permeable strains of yeast by the 26S complex without affecting its ATPase or isopeptidase activities. MG132 activates c-Jun N-terminal kinase (JNK1), which initiates apoptosis. MG132 also inhibits NF-κB activation with an IC50 of 3 μM and prevents β-secretase cleavage.
Sources: en.wikipedia.org
glycocalyx Also pericellular matrix and cell coat. A fine, hair-like coating covering the outer surface of virtually all cells, composed of a layer of various branching glycoproteins and glycolipids which are embedded within and protrude from the extracellular face of the cell membrane. These molecules play critical roles in cell–cell recognition, cell signaling, and intercellular adhesion.
The seven-year market exclusivity period differs from traditional patent law in that it does not begin until the drug is granted FDA approval and is independent of the drug's current patent status. Furthermore, if a market competitor wishes to introduce a drug for the same indication, the onus is on the competitor to prove that their drug is therapeutically superior (e.g. increased efficacy, less toxicity, etc.) when compared to the present drug indicated for the rare disease of interest. This incentive creates an attractive monopolistic market for companies interested in developing a product for any given rare disease. Television historian and Allmovie contributor Hal Erickson credits two episodes of the television series Quincy, M.E. for helping the ODA pass in the USA: "Seldom Silent, Never Heard" (1981) and "Give Me Your Weak" (1982). The show's star, Jack Klugman, even testified before Congress concerning the orphan drug issue.
One hypothesis is that these fetal cells might trigger a graft-versus-host reaction leading to autoimmune disease. This offers a potential explanation for why many autoimmune diseases are more prevalent in middle-aged women. Another hypothesis is that fetal cells come to injured or diseased maternal tissue where they act as stem cells and participate in repair. It is also possible that the fetal cells are merely innocent bystanders and have no effect on maternal health. After giving birth, about 50–75% of women carry fetal immune cell lines. Maternal immune cells are also found in the offspring yielding in maternal→fetal microchimerism, though this phenomenon is about half as frequent as the former. Microchimerism had also been shown to exist after blood transfusions to a severely immunocompromised population of patients who suffered trauma. Other possible sources of microchimerism include gestation, an individual's older sibling, twin sibling, or vanishing twin, with the cells being received in utero. Fetal-maternal microchimerism is especially prevalent after abortion or miscarriage.
=== Natural === Natural polymeric materials such as hemp, shellac, amber, wool, silk, and natural rubber have been used for centuries. A variety of other natural polymers exist, such as cellulose, which is the main constituent of wood and paper.
Sources: en.wikipedia.org
Heat therapy is useful for back spasms or other conditions. A review concluded that heat therapy can reduce symptoms of acute and subacute low-back pain. Regular activity and gentle stretching exercises is encouraged in uncomplicated back pain and is associated with better long-term outcomes. Physical therapy to strengthen the muscles in the abdomen and around the spine may also be recommended. These exercises are associated with better patient satisfaction, although they have not been shown to provide functional improvement. However, one review found that exercise is effective for chronic back pain but not for acute pain. Exercise should be performed under the supervision of a healthcare professional. Supervised walking programs have been shown to be cost-effective at reducing back pain recurrences. Massage therapy may provide short-term pain relief, but not functional improvement, for those with acute lower back pain. It may also offer short-term pain relief and functional improvement for those with long-term (chronic) and subacute lower pack pain, but this benefit does not appear to be sustained after six months of treatment. There do not appear to be any serious adverse effects associated with massage. Acupuncture may provide some relief for back pain. However, further research with stronger evidence is needed. Spinal manipulation appears to provide similar effects to other recommended treatments for chronic low back pain.
== On-line == On-line mass spectrometry was develop to solve some of the limitations and problem that develop from off-line analysis, such as evaporation and chemical reactions of particles in the filters during long analysis time. On-line Mass spectrometry solves these problems through the collection and analysis of aerosol particles in real time. On-line instruments are very portable and allow for spatial variability to be examined. These portable instruments can be put on many different platforms such as boats, planes, and mobile platforms (e.g. car trailers). An example of this is in the picture at the beginning with the instrumentation attached to an aircraft. Like off-line, on-line mass spectrometry has many different type of instruments, which can be broken up into two types; instruments that measures the chemistry of the particle ensemble (bulk measurement) and those that measure the chemistry of individual particles (single-particle measurement). Thus based on analytical need different instrumentation is used in analysis of the aerosol particles.
=== Global adoption === The gradual global adoption of refrigerators marks a transformative era in food preservation and domestic convenience. Since the refrigerators introduction in the 20th century, refrigerators have transitioned from being luxurious items to everyday commodities which have altered the understandings of food storage practices. Refrigerators have significantly impacted various aspects of many individual's daily lives by providing food safety to people around the world spanning across a wide variety of cultural and socioeconomic backgrounds. The global adoption of refrigerators has also changed how societies handle their food supply. The introduction of the refrigerator in different societies has resulted in the monetization and industrialized mass food production systems which are commonly linked to increased food waste, animal wastes, and dangerous chemical wastes being traced back into different ecosystems. In addition, refrigerators have also provided an easier way to access food for many individuals around the world, with many options that commercialization has promoted leaning towards low-nutrient dense foods. After consumer refrigerators became financially viable for production and sale on a large scale, their prevalence around the globe expanded greatly. In the United States, an estimated 99.5% of households have a refrigerator. Refrigerator ownership is more common in developed Western countries, but has stayed relatively low in Eastern and developing countries despite its growing popularity.
Sources: en.wikipedia.org
Selank is a synthetic peptide made of seven amino acids. It is modeled on tuftsin, a natural tetrapeptide, with an added three-residue tail. It is not a small-molecule drug.
It originates from research in Russia, associated with the Institute of Molecular Genetics of the Russian Academy of Sciences. The first descriptions date to the mid-1990s. Most published studies come from Russian laboratories.
No, Selank itself does not occur naturally. Its backbone is based on tuftsin, which is produced in the body, but the seven-residue version is a synthetic construct. It is supplied as a manufactured peptide.
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.