Tuftsin analog 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.
Last reviewed on 2025-09-08. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Pharmacokinetic data are sparse and largely derived from animal work. After intranasal administration the peptide appears in plasma within minutes, and reported half-lives are short, on the order of minutes to tens of minutes. Degradation proceeds through ordinary proteolytic cleavage into constituent amino acids and smaller fragments. Direct evidence that intact Selank reaches brain tissue in meaningful amounts is limited, and the extent of blood-brain barrier penetration is debated. Some authors argue that fragments, not the parent peptide, carry much of the observed activity.
Published clinical work is concentrated in Russian-language journals and generally involves small samples without independent replication. Systematic reviews in English note the shortage of randomised, placebo-controlled trials and the difficulty of verifying methods from translated reports. Outcome measures vary between studies, which complicates pooling of results. Interest in the compound as a cognitive or anxiolytic agent therefore rests on a thinner evidence base than the volume of citations suggests. Replication in well-powered trials with preregistered endpoints would be needed before firm conclusions about efficacy can be drawn.
| 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 |
Reversed-phase high-performance liquid chromatography is the standard technique for estimating peptide purity. The result is a peak-area percentage, which describes how much of the detected material elutes as the main peak in one run. Mass spectrometry confirms the molecular mass and can reveal truncated, adducted, or otherwise modified species. Amino acid analysis or tandem mass spectrometry can address sequence fidelity when identity is in doubt. None of these measurements, taken alone, establishes that a sample is fit for any specific purpose.
Lyophilized selank is normally supplied as a dry powder and is considered stable for extended periods when kept cold and dry. Moisture uptake is the main practical threat, because absorbed water promotes both hydrolysis and aggregation in the solid state. Vials are usually warmed to room temperature before opening so that condensation does not form on the powder. Supplier documentation commonly specifies -20 °C for routine storage, with -80 °C used for material intended to be archived for years.
Quality assessment of Selank samples typically combines purity determination with identity confirmation and counter-ion analysis. Purity is usually reported as a percentage by chromatographic area, with values above 95 percent often quoted for research-grade material. Water content and residual solvents are checked in lyophilized batches because they affect both stability and accurate mass determination. A reported purity figure does not by itself establish that a sample is the intended sequence, so orthogonal methods are needed to rule out sequence isomers or truncation products.
Characterization of Selank in laboratory settings relies on standard peptide analytical techniques. Reverse-phase high-performance liquid chromatography separates the peptide from related impurities and degradation products, while mass spectrometry confirms molecular identity through accurate mass measurement. Amino acid analysis and peptide sequencing verify the primary structure when reference material is unavailable. Because Selank is a short chain, fragmentation-based analysis produces a diagnostic ion pattern that supports confident identification.
Measuring peptide exposure inside the brain is technically difficult. Selank is degraded rapidly in plasma, and assays must separate intact peptide from fragments, which favors targeted mass spectrometry over immunoassays alone. Reported half-lives are short, on the order of minutes, so effects observed hours later are attributed to downstream signaling rather than to the parent compound. Blood-brain barrier permeability is debated and rarely quantified directly. Gaps include absent dose-response characterization, inconsistent reporting of purity, and almost no pharmacokinetic data from human participants.
Selank is studied chiefly as an animal-model anxiolytic with proposed secondary effects on memory and immune signaling. Reported mechanisms include modulation of the GABA-A receptor complex, inhibition of enkephalin-degrading enzymes, and shifts in monoamine turnover within limbic structures. Some experiments describe increased expression of brain-derived neurotrophic factor in the hippocampus after repeated dosing. No single molecular target has been confirmed, and the peptide does not bind any receptor with the selectivity typical of a conventional small-molecule drug. Mechanism therefore remains a set of hypotheses rather than an established pathway.
Laboratory work relies on standard behavioral paradigms. Rodents are tested in the elevated plus maze, open field, and passive avoidance tasks, with outcomes compared against diazepam or vehicle controls. Intranasal dosing is used most often because it bypasses first-pass metabolism, though intraperitoneal and intravenous routes also appear in published protocols. Biochemical endpoints include tissue BDNF concentrations, cytokine levels, and monoamine metabolites. Human data are limited to small Russian trials reporting reduced anxiety scores; most were not prospectively registered, and few employed independent outcome assessment.
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.
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.
== Application == APCI is suited for thermal stable samples with low to medium (less than 1500 Da) molecular weight, and low to medium polarity. It is particularly useful for analytes that are not sufficiently polar for electrospray. The application area of APCI is the analysis of drugs, nonpolar lipids, natural compounds, pesticides and various organic compounds, but it is of limited use in the analysis of biopolymers, organometallics, ionic compounds and other labile analytes.
On 23 April 2026, U.S. Army Master Sergeant Gannon Ken Van Dyke was arrested for allegedly placing more than US$33,300 in bets on the prediction site Polymarket based around whether or not Maduro would be "out by January 31, 2026" ("out" likely meaning removed from office). When the bets were successful, Van Dyke gained more than US$409,000 in winnings. According to an unsealed indictment in the Southern District of New York, Van Dyke was charged with theft of nonpublic government information, commodities fraud, wire fraud, unlawful use of confidential government information for personal gain, and engaging in monetary transactions from unlawful activity. According to the Justice Department, Van Dyke was involved in the planning and execution of the operation to capture Maduro. Van Dyke entered a not guilty plea on 28 April 2026. A federal judge set the tentative date of Van Dyke's trial to 7 December 2026.
Apothecia (fruiting bodies) are rare in Parmotrema perlatum. When present, they measure 4–8 mm across and are somewhat stalked and funnel-shaped with a brown, concave disc. The edges of these structures curl inward, becoming thick with soredia as they mature. Its spores are ellipsoid in shape and typically measure between 20 and 28 μm in length and 11 to 17 μm in width, with a wall thickness of 2–3 μm. Pycnidia, which are structures that produce asexual spores called conidia, appear sporadically on the surface (laminal) of the thallus, with the conidia being thread-like and straight, measuring 6–8 by 1 μm.
== Veterinary uses == Prednisolone is used in the treatment of inflammatory and allergic conditions in cats, dogs, horses, small mammals such as ferrets, birds, and reptiles. Its usage in treating inflammation, immune-mediated disease, Addison's disease, and neoplasia is often considered off-label use. Many drugs are commonly prescribed for off-label use in veterinary medicine." Studies in ruminating species, such as alpacas, have shown that oral administration of the drug is associated with a reduced bioavailability compared to intravenous administration; however, levels that are therapeutic in other species can be achieved with oral administration in alpacas. It is used in a broad spectrum of diseases, for example, inflammation of scleral tissues, cornea, and conjunctiva in dogs. In horses, prednisolone acetate suspensions are priorly used to treat inflammation in the middle layer of the eye, also known as anterior uveitis and equine recurrent uveitis (ERU), which is the leading cause of visual impairment in horses. Prednisolone acetate eye drops are not to be used in other animals such as birds. Prednisolone acetate eye drops are also prescribed to dogs and cats to lessen swelling, redness, burning, and pain sensations after surgeries of the eye. Cats with conjunctivitis usually are required to avoid using ophthalmic preparations of corticosteroids and its derivatives. The most typical infections are caused by herpes virus.
Sources: en.wikipedia.org
== Missile Impact Location System == From 1958 through 1960 the United States installed the Missile Impact Location System (MILS) in the Navy-managed Pacific Missile Range, later the Air Force–managed Western Range, to localize the splashdowns of test missile nose cones. MILS was developed and installed by the same entities that had completed the first phase of the Atlantic and U.S. West Coast SOSUS systems. A MILS installation, consisting of both a target array for precision location and a broad ocean area system for good positions outside the target area, was installed at Eniwetok as part of the system supporting intercontinental ballistic missile (ICBM) tests. Other Pacific MILS shore terminals were at the Marine Corps Air Station Kaneohe Bay supporting intermediate-range ballistic missile (IRBM) tests with impact areas northeast of Hawaii and the other ICBM test support systems at Midway Island and Wake Island.
Systems neuroscience research centers on the structural and functional architecture of the developing human brain, and the functions of large-scale brain networks, or functionally-connected systems within the brain. Alongside brain development, systems neuroscience also focuses on how the structure and function of the brain enables or restricts the processing of sensory information, using learned mental models of the world, to motivate behavior. Questions in systems neuroscience include how neural circuits are formed and used anatomically and physiologically to produce functions such as reflexes, multisensory integration, motor coordination, circadian rhythms, emotional responses, learning, and memory. In other words, this area of research studies how connections are made and morphed in the brain, and the effect it has on human sensation, movement, attention, inhibitory control, decision-making, reasoning, memory formation, reward, and emotion regulation. Specific areas of interest for the field include observations of how the structure of neural circuits effect skill acquisition, how specialized regions of the brain develop and change (neuroplasticity), and the development of brain atlases, or wiring diagrams of individual developing brains. The related fields of neuroethology and neuropsychology address the question of how neural substrates underlie specific animal and human behaviors. Neuroendocrinology and psychoneuroimmunology examine interactions between the nervous system and the endocrine and immune systems, respectively.
The austere settings in the game came about because testers spent too much time trying to complete the puzzles using decorative but non-functional elements. As a result, the setting was minimized to make the usable aspects of the puzzle easier to spot, using the clinical feel of the setting in the film The Island as reference. While there were plans for a third area, an office space, to be included after the test chambers and the maintenance areas, the team ran out of time to include it. They dropped the introduction of the Rat Man, a character who left the messages in the maintenance areas, to avoid creating too much narrative for the game, though the character was developed further in a tie-in comic "Lab Rat", that ties Portal and Portal 2's story together. According to project lead Kim Swift, the final battle with GLaDOS went through many iterations, including having the player chased by James Bond-inspired lasers (later applied in part to the turrets), a concept jokingly nicknamed "Portal Kombat" where the player would have needed to redirect rockets while avoiding turret fire, and a chase sequence following a fleeing GLaDOS. Eventually, they found that playtesters enjoyed a rather simple puzzle with a countdown timer near the end; Swift noted how "time pressure makes people think something is a lot more complicated than it really is", and Wolpaw admitted, "It was really cheap to make [the neurotoxin gas]" in order to simplify the dialogue during the battle.
== History == Effective pharmaceutical female sex-hormonal medications, including androgens, estrogens, and progestogens, first became available in the 1920s and 1930s, and might have been prescribed for transitions as early as the late 30s or 40s. The earliest report of hormone therapy in transgender women was published by Danish endocrinologist Christian Hamburger in 1953. One of his patients was Christine Jorgensen, who he had treated starting in 1950. Additional reports of hormone therapy in transgender women were published by Hamburger, the German-American endocrinologist Harry Benjamin, and other researchers in the mid-to-late 1960s. However, Benjamin had several hundred transgender patients under his care by the late 1950s, and had treated transgender women with hormone therapy as early as the late 1940s or early 1950s. In any case, Hamburger is said to be the first to treat transgender women with hormone therapy. One of the first transgender health clinics was opened in the mid-1960s at the Johns Hopkins School of Medicine. By 1981, there were almost 40 such centers. A review of the hormonal regimens of 20 of the centers was published that year. The first International Symposium on Gender Identity, chaired by Christopher John Dewhurst, was held in London in 1969, and the first medical textbook on transness, titled Transsexualism and Sex Reassignment and edited by Richard Green and John Money, was published by Johns Hopkins University Press in 1969. This textbook included a chapter on hormone therapy written by Christian Hamburger and Harry Benjamin.
== History == Because of its central geographic position within the Yugoslav federation, post-war Bosnia was strategically selected as a base for the development of the military defense industry. This contributed to a large concentration of arms and military personnel in Bosnia; a significant factor in the war that followed the break-up of Yugoslavia in the 1990s. However, Bosnia's existence within Yugoslavia, for the large part, was peaceful and prosperous. Being one of the poorer republics in the early 1950s it quickly recovered economically, taking advantage of its extensive natural resources to stimulate industrial development. The Yugoslavian communist doctrine of "brotherhood and unity" particularly suited Bosnia's diverse and multi-ethnic society that, because of such an imposed system of tolerance, thrived culturally and socially. The improvements to cultural tolerance throughout Bosnia and Herzegovina culminated with the selection of Sarajevo to host the 1984 Winter Olympics.
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.
Reports describe modulation of GABA signalling, changes in monoamine turnover and effects on neurotrophic factor expression. These observations come mainly from animal and cell studies. A single unifying mechanism has not been demonstrated.