Everything below concerns Intranasal route. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-10-26. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Proposed mechanisms center on modulation of the GABA system, but no single molecular target has been confirmed. Rodent studies report changes in GABA-A receptor expression and in the turnover of serotonin, dopamine, and norepinephrine in several brain regions. Increases in brain-derived neurotrophic factor and its receptor have also been described after repeated administration. These findings come largely from animal models, and the degree to which they describe human neurochemistry remains an open question. The mechanism is best characterized as multi-system and not fully resolved.
| 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 |
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.
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.
Regulatory status differs sharply by region. Selank holds a Russian marketing authorization, where it is supplied mainly as nasal drops, while authorities elsewhere have not approved it for medical use. Material sold internationally is therefore usually labeled as a research chemical rather than a medicine. Peer-reviewed publications come predominantly from Russian laboratories, and sample sizes are generally small. Whether the compound produces comparable effects under independent, well-controlled replication remains an open question that the broader literature has not settled.
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.
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.
== Special Operations units == The People's Armed Police maintains several Special Operations Units, also known by Western sources as "Special Police units". They were established in Beijing in early 1980s and in 1983 the first of them was transferred to the People's Armed Police as the People's Armed Police Special Police Group. In 1985 the Group became People's Armed Police Special Police School and, in 2002, it became the People's Armed Police Special Police Academy. In 2002, the Snow Wolf Commando Unit, since 2007 Snow Leopard Commando Unit, was established in Beijing as the second special police unit. According to Joel Wuthnow, the Snow Leopard Commando Unit was moved from the Beijing Corps to the 2nd Mobile Corps in 2018. The special operations units are tasked to carry out counter terrorism missions, riot control, anti-hijacking and bomb disposal. Local special operations units receive Explosive Ordinance Disposal (EOD) training, fast roping, counterinsurgency tactics, along with training in hostage rescue and hostage negotiation.
=== Parthenogenesis === When female American cockroaches are housed in groups, this close association promotes facultative parthenogenic reproduction. The oothecae are produced asexually, without fertilization. The process by which the eggs are produced is automixis; during automixis, meiosis occurs, but instead of giving rise to haploid gametes as ordinarily happens, diploid gametes are produced (probably by terminal fusion of meiotic products) that can then develop into female cockroaches. Eggs produced by parthenogenesis have lower viability than eggs produced by sexual reproduction.
== Packaging == Centralized cutting and processing of meats has the potential of reducing the shelf life of the cuts. Specialized packaging is needed to regain and even extend that shelf life. Packaging includes tray, absorbent pad (meat diaper), specialty plastic films, etc. Oxygen scavengers and modified atmosphere packaging are used to keep the products visually appealing and consumer safe.
=== Biomarkers === Lateral-flow assays have also been developed for biomarkers such as levels of a certain protein in blood or urine. The HCG (pregnancy) test is one example. If the molecule to test for is present in healthy people at a lower level, the assay needs to have an LoD high enough to not show positive for the healthy, reference level. An example is the blood cardiac troponin I (cTnI) LFT, which comes in both qualitative (cTnI > 0.5 ng/L) and quantitative variants. The cTnI LFTs are not as sensitive as a typical lab test, but are sufficient to "rule in" serious cases much faster than a lab test can. Another example is the LFT for sFlt1/PlGF ratio, a predictive biomarker for pre-eclampsia.
=== Insulin signaling === IGF-1 binds to at least two cell surface receptors: the IGF1 Receptor (IGFR), and the insulin receptor. The IGF-1 receptor seems to be the "physiologic" receptor—it binds IGF-1 at significantly higher affinity than it binds insulin. Like the insulin receptor, the IGF-1 receptor is a receptor tyrosine kinase—meaning it signals by causing the addition of a phosphate molecule on particular tyrosines. IGF-1 activates the insulin receptor at approximately 10% the potency of insulin. Part of this signaling may be via IGF1R/insulin receptor heterodimers (the reason for the confusion is that binding studies show that IGF-1 binds the insulin receptor 100-fold less well than insulin, yet that does not correlate with the actual potency of IGF-1 in vivo at inducing phosphorylation of the insulin receptor, and hypoglycemia).
Sources: en.wikipedia.org
== Legal Issues == On 2 May 2018, he was charged with seven counts of drug trafficking and possession. He was released on $20,000 bail to appear in court at a later date. He was later cleared of trafficking but convicted of possession.
== Structure == Lysine carboxypeptidase has a molecular weight of between 270 and 330 kDa (kilodaltons). It is a tetrameric glycoprotein. It is composed of two 83 kDa subunits and two active subunits between 55 kDa and 48 kDa and these are held together by non-covalent interactions. The 83 kDa subunits are regulatory and do not directly contribute to catalytic activity; they are also heavily glycosylated. These function to stabilize the active subunits and keep them in circulation. Catalytic functioning is retained when the 83 kDa subunits are eliminated from the active subunits, but they are still necessary for their support roles. The active subunits are small and relatively unstable at body temperature and blood pH, so they would not last long in the plasma without the regulatory subunits attached. The 55 kDa-48 kDa portions are both catalytically active. The primary structure of the 83 kDa subunit can be split into three main domains. The first domain is located at the N-terminus and consists of 52 amino acids with the first 27 being cysteine-rich. The second domain refers to the next 312 amino acids and it consists of 13 leucine-rich repeat (LRR) sections, each made up of 24 residues. The final C-terminal domain refers to the last 145 residues where amino acids 400-425 hold a cysteine-rich section. The secondary/tertiary structure of the subunit has not yet been experimentally determined, but it has been hypothesized based upon how other LRR proteins fold.
The ability of the medium to swell in liquid is based on the cross-linking of these substances, the pH and the ion concentrations of the buffers used. Incorporation of high temperature and pressure allows a significant increase in the efficiency of ion chromatography, along with a decrease in time. Temperature has an influence of selectivity due to its effects on retention properties. The retention factor (k = (tRg − tMg)/(tMg − text)) increases with temperature for small ions, and the opposite trend is observed for larger ions. Despite ion selectivity in different mediums, further research is being done to perform ion exchange chromatography through the range of 40–175 °C. An appropriate solvent can be chosen based on observations of how column particles behave in a solvent. Using an optical microscope, one can easily distinguish a desirable dispersed state of slurry from aggregated particles.
=== Chronic exposures === The long-term toxicity of copper has not been well studied in humans, but it is infrequent in normal populations that do not have a hereditary defect in copper homeostasis. There is little evidence to indicate that chronic human exposure to copper results in systemic effects other than liver injury. Chronic copper poisoning leading to liver failure was reported in a young adult male with no known genetic susceptibility who consumed 30–60 mg/d of copper as a mineral supplement for 3 years. Individuals residing in U.S. households supplied with tap water containing >3 mg/L of copper exhibited no adverse health effects. No effects of copper supplementation on serum liver enzymes, biomarkers of oxidative stress, and other biochemical endpoints have been observed in healthy young human volunteers given daily doses of 6 to 10 mg/d of copper for up to 12 weeks. Infants aged 3–12 months who consumed water containing 2 mg Cu/L for 9 months did not differ from a concurrent control group in gastrointestinal tract (GIT) symptoms, growth rate, morbidity, serum liver enzyme and bilirubin levels, and other biochemical endpoints.) Serum ceruloplasmin was transiently elevated in the exposed infant group at 9 months and similar to controls at 12 months, suggesting homeostatic adaptation and/or maturation of the homeostatic response. Dermal exposure has not been associated with systemic toxicity but anecdotal reports of allergic responses may be a sensitization to nickel and cross-reaction with copper or a skin irritation from copper.
According to Al Jazeera, outdated medical equipment, airport closures, and budget cuts are jeopardizing patient outcomes in Yemen. More than a decade of war in Yemen has taken a heavy toll on the healthcare system. People in the country are unable to afford treatment for serious illnesses, such as cancer, due to restrictions on travel abroad for treatment, a lack of medical facilities, and insufficient resources.
Sources: en.wikipedia.org
=== Effects in females === FSH stimulates the growth and recruitment of immature ovarian follicles in the ovary. In early (small) antral follicles, FSH is the major survival factor that rescues the small antral follicles (2–5 mm in diameter for humans) from apoptosis (programmed death of the somatic cells of the follicle and oocyte). In the luteal-follicle phase transition period the serum levels of progesterone and estrogen (primarily estradiol) decrease and no longer suppress the release of FSH, consequently FSH peaks at about day three (day one is the first day of menstrual flow). The cohort of small antral follicles is normally sufficient in number to produce enough Inhibin B to lower FSH serum levels. In addition, there is evidence that gonadotropin surge-attenuating factor produced by small follicles during the first half of the follicle phase also exerts a negative feedback on pulsatile luteinizing hormone (LH) secretion amplitude, thus allowing a more favorable environment for follicle growth and preventing premature luteinization. As a woman nears perimenopause, the number of small antral follicles recruited in each cycle diminishes and consequently insufficient Inhibin B is produced to fully lower FSH and the serum level of FSH begins to rise. Eventually, the FSH level becomes so high that downregulation of FSH receptors occurs and by postmenopause any remaining small secondary follicles no longer have FSH nor LH receptors. When the follicle matures and reaches 8–10 mm in diameter it starts to secrete significant amounts of estradiol.
A subset of progeria patients with heterozygous mutations of LMNA have presented an atypical form of the condition, with initial symptoms not developing until late childhood or early adolescence. These patients have had longer lifespans than those with typical-onset progeria. This atypical form is extremely rare, with presentations of the condition varying between patients with even the same mutation. The general phenotype of atypical cases is consistent with typical progeria, but other factors (severity, onset, and lifespan) vary in presentation.
An evaporative light scattering detector (ELSD) is a destructive chromatography detector, used in conjunction with high-performance liquid chromatography (HPLC), ultra high-performance liquid chromatography (UHPLC), purification liquid chromatography such as flash or preparative chromatography (using a splitter), countercurrent or centrifugal partition chromatography and supercritical fluid chromatography (SFC). It is commonly used for analysis of compounds that do not absorb UV-VIS radiation significantly, such as sugars, antiviral drugs, antibiotics, fatty acids, lipids, oils, phospholipids, polymers, surfactants, terpenoids and triglycerides. ELSDs works by nebulizing the column's effluents into a fine aerosol mist, which then passes through a heated drift tube, where the solvent evaporates. Thus, it can be easily used in gradient method of LC and SFC. The remaining non-volatile analyte particles are carried further by a carrier gas to a light scattering cell, where a beam of light illuminates them and they scatter it. The scattered light proceeds to a photodiode which converts it to a signal, which is proportional to the mass of the analyte particles. This is why it is considered as a sort of "universal detector" as it is able to detect all compound which are less volatile than the mobile phase, i.e. non volatile and semi-volatile compounds. ELSD is related to the charged aerosol detector (CAD), in which the aerosol is charged. Like the CAD, it falls under the category of destructive detectors.
Factors unrelated to the oil's composition are also important, such as the volume of oil utilized, the size of the container, the presence of air currents, and the type and source of light. And practically, even when smoke is cooked in ovens set to above its true smoke point, moisture and other objects can prevent it from reaching the full temperature. The smoke point also decreases over time when oil is reused. Cooks in practice tend to avoid the smoke point by noticing when the oil begins to shimmer, which happens just before it begins to smoke; adding food (to absorb heat) or lowering the temperature will prevent smoking. Acrolein, a potential carcinogen, is often present in the smoke, but this is only an issue to, for example, line cooks burning large quantities of food who breathe in large quantities of smoke over long periods, and not for home cooks. This is because oil chemically decomposes into free fatty acids and glycerol, and at sufficiently high temperatures glycerol with burn to form acrolein. Free radicals produced by the high temperatures, although much reported on, are not dangerous.
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.
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.