This is a working overview of Intranasal delivery, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
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.
| 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 |
Outside its country of origin the compound is generally handled as a research chemical rather than an approved medicine. No regulatory approval from the United States Food and Drug Administration or the European Medicines Agency has been granted for human use. Identity and purity are normally checked by reverse-phase high-performance liquid chromatography, with mass spectrometry used to confirm the molecular mass. Lyophilised material is stored cold and desiccated, and repeated freeze-thaw cycles are avoided.
Published work on this peptide almost always uses intranasal delivery, with drops or a spray applied to the nasal mucosa. Some animal experiments have used subcutaneous or intraperitoneal injection, and a smaller number have compared routes directly. Oral administration is not a focus of the literature, because short peptides of this size are broken down by digestive enzymes and cross intestinal barriers poorly. How much of an intranasal dose reaches the bloodstream intact in humans remains an open question.
Animal studies have examined behaviour in tests of anxiety, memory retention and stress response, and several report changes in neurotrophic or neurotransmitter-related markers. The human evidence base is much smaller, consisting mainly of short trials conducted in Russia with limited reporting in English-language journals. Sample sizes are modest and outcome measures vary between studies, so the findings are best described as preliminary. Independent replication under modern trial standards has not been widely reported.
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.
Once dissolved, the peptide is markedly less stable than the dry powder. Aqueous solutions are subject to backbone hydrolysis and to microbial growth when they are handled without sterile technique. Buffered solutions near neutral pH are common for short-term laboratory work, while acidic conditions are sometimes used to improve solubility. Analytical laboratories generally prepare working solutions fresh rather than storing them, and a residual water film left in a reopened vial can seed degradation even when the container appears dry.
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.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, frequently abbreviated as TKPRPGP. It was designed as a structural analogue of tuftsin, a naturally occurring tetrapeptide released by enzymatic cleavage of the immunoglobulin heavy chain. The two additional proline residues at the C-terminal end extend the parent chain and change how the molecule behaves in solution. The free peptide has a calculated molecular mass of approximately 751.9 g/mol and is generally supplied as a lyophilised white to off-white powder.
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.
=== Physical volume of an organism === This concept is related to multi-compartmentalization. Any drugs within an organism will act as a solute and the organism's tissues will act as solvents. The differing specificities of different tissues will give rise to different concentrations of the drug within each group. Therefore, the chemical characteristics of a drug will determine its distribution within an organism. For example, a liposoluble drug will tend to accumulate in body fat and water-soluble drugs will tend to accumulate in extracellular fluids. The volume of distribution (VD) of a drug is a property that quantifies the extent of its distribution. It can be defined as the theoretical volume that a drug would have to occupy (if it were uniformly distributed), to provide the same concentration as it currently is in blood plasma. It can be determined from the following formula:
=== Cardiovascular outcomes in type 2 diabetes === A major focus of McGuire's research has been understanding how antihyperglycemic therapies for type 2 diabetes affect cardiovascular risk. His work has helped establish the modern framework of cardiovascular outcome trials (CVOTs), emphasizing the need to demonstrate not only glycemic control but also cardiovascular safety and benefit. He has written on the evolving ethical and scientific challenges of trial design in an era when a number of antihyperglycemic medications have shown cardiovascular protection, advocating for creative trial designs for randomized assessment of novel agents against active comparators with established evidence of efficacy.
=== Runoff and percolation === Solid bait and liquid insecticides, especially if improperly applied in a location, get moved by water flow. Often, this happens through nonpoint sources where runoff carries insecticides in to larger bodies of water. As snow melts and rainfall moves over and through the ground, the water picks applied insecticides and deposits them in to larger bodies of water, rivers, wetlands, underground sources of previously potable water, and percolates in to watersheds. This runoff and percolation of insecticides can effect the quality of water sources, harming the natural ecology and thus, indirectly effect human populations through biomagnification and bioaccumulation.
Students who received the copies flagged blurred answer sheets, missing pages, and, in some cases, received another student’s answer book. The controversy intensified significantly when a Delhi-based student, Vedant Shrivastava, shared evidence on social media that his Physics answer sheet uploaded under his roll number featured different handwriting and belonged to someone else. Soon after, he became the target of trolling and abusive comments online. Some called him "anti-national", while others labelled him "Pakistani". Among those who initially called the student a "Pakistani" was Doordarshan News journalist Ashok Shrivastav. He later apologised, but his remarks sparked massive backlash online. After the complaint went viral, CBSE officially acknowledged the technical error, issued the correct answer sheet to the student, and promised to rectify his result. The board faced further backlash following allegations that it attempted to manage public perception rather than addressing structural evaluation errors. Reports surfaced indicating that CBSE had allegedly circulated a communication toolkit to schools and forced school principals to flood social media with coordinated videos and posts defending its controversial On-Screen Marking System (OSM). Independent observers and online watchdogs noted a coordinated pattern where multiple school principals and institutions published videos using identical phrasing to praise the digital evaluation system.
== Evolutionary role of cysteine == Cysteine is considered a "newcomer" amino acid, being the 17th amino acid incorporated into the genetic code. Similar to other later-added amino acids such as methionine, tyrosine, and tryptophan, cysteine exhibits strong nucleophilic and redox-active properties. These properties contribute to the depletion of cysteine from respiratory chain complexes, such as Complexes I and IV, since reactive oxygen species (ROS) produced by the respiratory chain can react with the cysteine residues in these complexes, leading to dysfunctional proteins and potentially contributing to aging. The primary response of a protein to ROS is the oxidation of cysteine and the loss of free thiol groups, resulting in increased thiyl radicals and associated protein cross-linking. In contrast, another sulfur-containing, redox-active amino acid, methionine, does not exhibit these biochemical properties and its content is relatively upregulated in mitochondrially encoded proteins.
Sources: en.wikipedia.org
==== MeSH E05.393.760 – sequence analysis ==== MeSH E05.393.760.640 – oligonucleotide array sequence analysis MeSH E05.393.760.700 – sequence analysis, dna MeSH E05.393.760.700.300 – dna mutational analysis MeSH E05.393.760.705 – sequence analysis, protein MeSH E05.393.760.705.685 – peptide mapping MeSH E05.393.760.705.685.690 – protein footprinting MeSH E05.393.760.710 – sequence analysis, rna
Following that investigation and one of their own that faulted the university for failing to act on warnings and protect the campus, the university's faculty senate voted "no confidence" in the president and many other leaders at the university. In 2023, the University of Arizona faced a financial crisis, allegedly "losing track of more than $240 million through accounting errors and flawed financial projections." Subsequent investigative reporting by The Arizona Republic linked much of the crisis to the university's purchase of Ashford University, accusing university administrators of knowing that Ashford was experiencing "a downward enrollment spiral that began years before [the purchase] and dismal graduation and retention rates". In April 2024, the UA chapter of Students for Justice in Palestine joined student protests across the USA against the war in Gaza, during what they called "Israeli Apartheid Week". The encampment was attacked and dispersed by police firing rubber bullets, tear gas and pepper balls. Bystanders and press were also hurt in the police violence. The students were protesting against UA involvement with companies supporting the "genocide and ethnic cleansing in Palestine" and called for divestment.
== Progression == Reports of a fire at the warehouse first began shortly after 2:30 p.m. June 17, 2026, a 491,000-square-foot commercial cold storage facility operated by Lineage Logistics at 1400 S. Los Palos St. About two hours later, a large black smoke cloud erupted over the warehouse, which could be seen throughout the city, even days after the fire had started. A state of emergency was declared three days later on June 20 by Mayor Bass.
== Consumer acceptance == Historically, consumers paid little attention to food technologies. Nowadays, the food production chain is long and complicated and food technologies are diverse. Consequently, consumers are uncertain about the determinants of food quality and find it difficult to understand them. Now, acceptance of food products very often depends on perceived benefits and risks associated with food. Popular views of food processing technologies matter. Especially innovative food processing technologies often are perceived as risky by consumers. Acceptance of the different food technologies varies. While pasteurization is well recognized and accepted, high pressure treatment and even microwaves often are perceived as risky. Studies by the Hightech Europe project found that traditional technologies were well accepted in contrast to innovative technologies. Consumers form their attitude towards innovative food technologies through three main mechanisms: First, through knowledge or beliefs about risks and benefits correlated with the technology; second, through attitudes based on their own experience; and third, through application of higher order values and beliefs. A number of scholars consider the risk-benefit trade-off as one of the main determinants of consumer acceptance, although some researchers place more emphasis on the role of benefit perception (rather than risk) in consumer acceptance.
All these reports were written in context of Jesuit missions in South America, specially the Mainas missions, in Latin and sent only to Rome, so their audience was not very large and they were promptly lost in the archives. For this reason, ayahuasca did not receive attention for the entire subsequent century.
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.
Selank is a synthetic heptapeptide designed as a stabilized analog of the natural tetrapeptide tuftsin. It has been investigated mainly for anxiolytic and cognitive effects. It is not an approved pharmaceutical in most countries.