This is a working overview of Selank, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-03-26. Anything still debated is marked as such rather than presented as settled.
Lyophilized Selank, the dry powder form, is generally stored frozen at minus 20 degrees Celsius or colder for long-term keeping. The solid is hygroscopic and should stay sealed, dry, and protected from light. Once dissolved, the peptide is less stable and is usually held refrigerated at 2 to 8 degrees Celsius for short periods. Repeated freezing and thawing is avoided because it can promote aggregation and loss of activity. Buffers and pH choice also affect how long a solution remains usable.
Solubility behavior is a practical concern for handling. Selank dissolves readily in water and in common aqueous buffers, which simplifies preparation of working solutions. The choice of solvent, ionic strength, and pH can influence aggregation over time, particularly at higher concentrations. Aqueous solutions are typically sterile-filtered before use. Because stability depends on several variables, storage and handling notes should be treated as general guidance rather than fixed rules, and specific values are best confirmed against a certificate of analysis for each batch.
Published clinical evidence is limited. Most controlled trials were conducted in Russia, enrolled modest numbers of participants, and appeared in Russian-language journals, which restricts independent verification. Reported outcomes include lower anxiety scores, improved attention and memory measures, and changes in fatigue ratings. Reviews written in English note methodological limitations such as small samples and inconsistent endpoints. Whether the compound produces clinically meaningful benefit relative to established anxiolytics is therefore an open question rather than an established finding.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences as a structural analogue of tuftsin, a naturally occurring tetrapeptide fragment of the immunoglobulin heavy chain. The added Pro-Gly-Pro tail was intended to slow enzymatic degradation and extend biological activity. In Russia it is registered as an anxiolytic nasal preparation, while regulators elsewhere have not approved it for clinical use.
Proposed mechanisms centre on modulation of the GABAergic system, with reports of altered expression of genes related to GABA-A receptor subunits and changed monoamine turnover. Some studies describe inhibition of enkephalinase, the enzyme that degrades endogenous enkephalins, which may prolong opioid peptide signalling. Effects on brain-derived neurotrophic factor and on cytokine expression have also been reported. These findings come largely from animal models and small human studies, and the precise primary target remains unresolved.
| Property | Value | Notes |
|---|---|---|
| Solubility | Freely soluble in water | Also in aqueous buffers |
| Typical purity (HPLC) | 95 percent or higher | Lot-dependent |
| Dry powder storage | Minus 20 degrees Celsius | Sealed, dry, protected from light |
| Solution storage | 2 to 8 degrees Celsius | Short-term use |
| Identity confirmation | Mass spectrometry | ESI or MALDI-TOF |
Development took place at the Institute of Molecular Genetics of the Russian Academy of Sciences, where a series of short peptides were designed in the 1980s and 1990s. Selank was selected from variants of tuftsin that showed resistance to plasma peptidases. Russian regulatory approval covers it as an anxiolytic agent given intranasally. Outside that market the compound is normally handled as a research chemical rather than a medicine, and no widely recognised international pharmacopoeial monograph exists. The name Selank is a coined trade designation rather than a systematic chemical name.
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.
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.
=== Coils === Vaping cannabis usually involves higher temperatures than nicotine. Internal components of e-cigarettes can add metals and metalloids to the aerosol, including lead, nickel, and antimony.
== Causes == DEB is caused by genetic defects (or mutations) within the human COL7A1 gene encoding the protein type VII collagen (collagen VII). DEB-causing mutations can be either dominant or recessive. Most families with family members with this condition have distinct mutations. Collagen VII is a very large molecule (300 kDa) that dimerizes to form a semicircular looping structure: the anchoring fibril. Anchoring fibrils are thought to form a structural link between the epidermal basement membrane and the fibrillar collagens in the upper dermis.
== Common mass spectrometer configurations and techniques == When a specific combination of source, analyzer, and detector becomes conventional in practice, a compound acronym may arise to designate it succinctly. One example is MALDI-TOF, which refers to a combination of a matrix-assisted laser desorption/ionization source with a time-of-flight mass analyzer. Other examples include inductively coupled plasma-mass spectrometry (ICP-MS), accelerator mass spectrometry, thermal ionization-mass spectrometry (TIMS) and spark source mass spectrometry. Certain applications of mass spectrometry have developed monikers that although strictly speaking would seem to refer to a broad application, in practice have come instead to connote a specific or a limited number of instrument configurations. An example of this is isotope-ratio mass spectrometry, which refers in practice to the use of a limited number of sector based mass analyzers; this name is used to refer to both the application and the instrument used for the application.
Experiment D-8 used five dosimeters to measure the radiation in the spacecraft environment. Of particular interest was the South Atlantic Anomaly. Experiment D-9 was an experiment in simple spacecraft navigation where the crew used a sextant to measure their position using the stars. The objective was to investigate the feasibility of using this technique for lunar flights on the Apollo program. Experiments S-5 and S-6 were both photography experiments where they used a 70-millimeter Hasselblad camera to photograph the weather and terrain below them. There were two medical experiments: M-3 and M-4. The first was a bungee cord that the crew used for exercise. They said, after the mission, that this got harder as the mission went on, though this may have been due to a lack of sleep. The second was the phonocardiogram experiment, which had sensors attached to their bodies that measured heartbeat rates, especially during liftoff, EVA, and reentry. There were four engineering experiments:
==== Donations to campaign ==== In February 2024, Bloomberg News reported that Newsom pushed for an exemption for businesses that bake and sell bread in AB 1228, a bill that raises the state's minimum wage for fast food workers to $20 per hour. The exemption included 24 Panera Bread bakery-cafes owned by Greg Flynn, a businessman who donated $100,000 and $64,800 to Newsom's campaigns over the years. Republican lawmakers called for an investigation into the unusual exemption. When reporters asked him about the exemption, Newsom said: "That's a part of the sausage making. We went back and forth, and that was part of the negotiation. That's the nature of negotiation ... That was all part of the give and take and that was the collective wisdom of the legislature and ultimately led to my signature." In September 2024, the Los Angeles Times reported that Newsom had signed AB 3206 into law, carving out an exception to the state's last call alcohol law for one specific venue, Intuit Dome, owned by former Microsoft CEO Steve Ballmer. Ballmer's wife, Connie Ballmer, donated $1 million to the Newsom campaign in 2021. Ethics experts criticized the bill for exclusively benefiting a major donor to Newsom. "It's certainly going to become an issue for his opponents and critics to point to the fact that he seemed to provide a special favor to a wealthy sports franchise owner and its facility and its wealthy fans. It just doesn't look good", said John Pelissero, director of government ethics at Santa Clara University.
Sources: en.wikipedia.org
==== Major Intrinsic Protein ==== The Major Intrinsic Protein (MIP) of the human lens of the eye (Aqp0), after which the MIP family was named, represents about 60% of the protein in the lens cell. In the native form, it is an aquaporin (AQP), but during lens development, it becomes proteolytically truncated. The channel, which normally houses 6-9 water molecules, becomes constricted so only three remain, and these are trapped in a closed conformation. These truncated tetramers form intercellular adhesive junctions (head to head), yielding a crystalline array that mediates lens formation with cells tightly packed as required to form a clear lens. Lipids crystallize with the protein. Ion channel activity has been shown for Aquaporins 0, 1, and 6, Drosophila 'Big Brain' (bib) and plant Nodulin-26. Roles of aquaporins in human cancer have been reviewed as have their folding pathways. AQPs may act as transmembrane osmosensors in red cells, secretory granules and microorganisms. MIP superfamily proteins and variations of their selectivity filters have been reviewed.
However, insulin therapy may be conducted without CGM and although there is not yet an automated insulin-regulation feedback mechanism between measure and infusion to control the amount and timing of insulin, this is clearly a future objective. Any change in basal or bolus is patient-driven by programming the pump using the Bolus Wizard. The latest model pumps are the MiniMed Paradigm 522 and 722, which differ in reservoir size, 176 versus 300 units, respectively. In 2007 the FDA approved a pediatric model for patients 7 to 17 years old.
Manimajra (now referred to as ''Sector 13') is a significant residential and commercial hub in Chandigarh. Reconstituted in February 2020, it bridges the city's historical princely roots with its modern industrial expansion.
A distinguishing feature of SARS‑CoV‑2 is its incorporation of a polybasic site cleaved by furin, which appears to be an important element enhancing its virulence. It was suggested that the acquisition of the furin-cleavage site in the SARS-CoV-2 S protein was essential for zoonotic transfer to humans. The furin protease recognises the canonical peptide sequence RX[R/K] R↓X where the cleavage site is indicated by a down arrow and X is any amino acid. In SARS-CoV-2 the recognition site is formed by the incorporated 12 codon nucleotide sequence CCT CGG CGG GCA which corresponds to the amino acid sequence P RR A. This sequence is upstream of an arginine and serine which forms the S1/S2 cleavage site (P RR A R↓S) of the spike protein. Although such sites are a common naturally-occurring feature of other viruses within the Subfamily Orthocoronavirinae, it appears in few other viruses from the Beta-CoV genus, and it is unique among members of its subgenus for such a site. The closest relatives to SARS-CoV-2, including BANAL-20-52, RaTG13, Pangolin P4L, and SARS-CoV-1, lack the RRAR insertion. The furin cleavage site PRRAR↓ is highly similar to that of the feline coronavirus, an alphacoronavirus 1 virus. Viral genetic sequence data can provide critical information about whether viruses separated by time and space are likely to be epidemiologically linked. With a sufficient number of sequenced genomes, it is possible to reconstruct a phylogenetic tree of the mutation history of a family of viruses.
Sources: en.wikipedia.org
An alternating copolymer has regular alternating A and B units, and is often described by the formula: -A-B-A-B-A-B-A-B-A-B-, or -(-A-B-)n-. The molar ratio of each monomer in the polymer is normally close to one, which happens when the reactivity ratios r1 and r2 are close to zero, as can be seen from the Mayo–Lewis equation. For example, in the free-radical copolymerization of styrene maleic anhydride copolymer, r1 = 0.097 and r2 = 0.001, so that most chains ending in styrene add a maleic anhydride unit, and almost all chains ending in maleic anhydride add a styrene unit. This leads to a predominantly alternating structure. A step-growth copolymer -(-A-A-B-B-)n- formed by the condensation of two bifunctional monomers A–A and B–B is in principle a perfectly alternating copolymer of these two monomers, but is usually considered as a homopolymer of the dimeric repeat unit A-A-B-B. An example is nylon 66 with repeat unit -OC-( CH2)4-CO-NH-(CH2)6-NH-, formed from a dicarboxylic acid monomer and a diamine monomer.
==== Dopamine synthesis enhancement ==== Although it is frequently labeled as a stimulant, bromantane is distinct in its pharmacology and effects relative to typical stimulants, such as the phenethylamines (e.g., amphetamine and its derivatives) and their structural analogues (e.g., methylphenidate, cocaine, mesocarb, etc.). Whereas the latter directly act on the dopamine transporter (DAT) to inhibit the reuptake and/or induce the release of dopamine, bromantane instead acts via indirect genomic mechanisms to produce a rapid, pronounced, and long-lasting upregulation in a variety of brain regions of the expression of tyrosine hydroxylase (TH) and aromatic L-amino acid decarboxylase (AAAD) (also known as DOPA decarboxylase), key enzymes in the dopamine biosynthesis pathway. For instance, a single dose of bromantane produces a 2–2.5 fold increase in TH expression in the rat hypothalamus 1.5–2 hours post-administration. The biosynthesis and release of dopamine subsequently increase in close correlation with TH and AAAD upregulation. Enhancement of dopaminergic neurotransmission is observed in the hypothalamus, striatum, ventral tegmental area, nucleus accumbens, and other regions. As such, the key mechanism of the pharmacological activity and psychostimulant effects of bromantane is activation of the de novo synthesis of dopamine via modulation of gene expression. A selection of quoted excerpts from the medical literature detail the differences between bromantane and typical stimulants:
=== Humanitarian response === The Lebanon Humanitarian Fund launched its reserve allocation that includes up to US$4 million to support its partners to help aid those who have been displaced or still in conflict zones.
The domain of automotive design has been traditionally characterized as male-dominated. As a result, there has been a lack of female automotive designers in the area of automotive safety compared to male automotive designers. This leads to oversights in automotive safety and ergonomics for female consumers, who make up 62% of all new cars sold in the USA. According to the Insurance Institute for Highway Safety (IIHS), women are less likely to get into a crash than men are. However, women are 17% more likely to die in a car crash and 73% more likely to sustain serious injuries from a crash when compared to men. In rear-end collisions, female drivers face a higher risk of whiplash injuries when compared to their male counterparts due to their lighter weight which causes them to be propelled forward more rapidly. To mitigate these problems, Consumer Reports states that regulators have called for a female crash dummy to be implemented in crash testing since 1980. When pregnant, women should continue to use seatbelts and airbags properly. A University of Michigan study found that "unrestrained or improperly restrained pregnant women are 5.7 times more likely to have an adverse fetal outcome than properly restrained pregnant women". If seatbelts are not long enough, extensions are available from the car manufacturer or an aftermarket supplier.
An NTP binding site is a type of binding site found in nucleoside monophosphate (NMP) kinases, N can be adenosine or guanosine. A P-loop is one of the structural motifs common for nucleoside triphosphate (NTP) binding sites, it interacts with the bound nucleotide's phosphoryl groups. For the binding site to be able to bind a nucleotide, the nucleotide must be complex bound to Mg2+ or Mn2+. Nucleotide binding will cause conformational changes in the protein because the P-loop will bend. NTP binding sites play a role in poliovirus RNA replication. On the poliovirus RNA-dependent polymerase, also known as 3Dpol, there are two binding sites. Both binding sites contain lysine residues; however, only the lysine at position 61 is essential for RNA sequence elongation as part of the replication process. Additionally, a method known as computational alanine mutagenesis, has been used to find the key portions within the amino acid sequences that majorly characterize a particular NTP binding site; these regions within the sequence are conserved.
Sources: en.wikipedia.org
Reverse-phase HPLC is the usual method and gives a percentage purity value. Mass spectrometry then confirms the molecular mass. Together they provide a basic identity and purity profile for a lot.
Freeze-dried material is kept frozen, often at minus 20 degrees Celsius, and protected from light and moisture. Dissolved peptide is refrigerated for short-term use. Repeated freeze-thaw cycles are avoided.
A certificate of analysis typically lists purity by HPLC, the confirmed mass, appearance, and sometimes water or counter-ion content. It documents results for a specific batch. Details vary by supplier.
It is a seven-amino-acid peptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, produced by chemical synthesis rather than extracted from biological tissue. Its design is based on tuftsin, a natural immunomodulatory tetrapeptide. The C-terminal Pro-Gly-Pro segment is a common stabilising motif in short regulatory peptides.