Semax raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-11-02. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
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.
| 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 |
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.
Lyophilized material is generally stable for extended periods when kept dry at or below minus twenty degrees Celsius. Working solutions are less stable, and common practice is to aliquot and freeze them so that repeated freeze-thaw cycles are avoided. Aqueous solutions are sensitive to pH extremes and to microbial growth, so short-term storage at refrigerator temperature is typical. Oxidation and hydrolysis are the principal degradation routes. Reconstitution with sterile water or a mild buffer is standard, and solutions should be protected from light.
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.
=== SGLT inhibition === McGuire is known for his research on sodium-glucose cotransporter-2 (SGLT2) and SGLT1/2 inhibitors. McGuire has had consultancy and/or trial leadership roles for all SGLT inhibitors presently available for clinical use in the US, and he has contributed to iterative meta-analyses of randomized CVOT trials data on SGLT2 and SGLT1/2 inhibitors. These analyses found that SGLT inhibitors reduce the risk of MACE, hospitalization for heart failure, and progression of chronic kidney disease. The benefits were consistent across patients with and without type 2 diabetes and across varying levels of cardiovascular and kidney risk.
Ornithine is a non-proteinogenic α-amino acid that plays an essential role in the urea cycle (to the extent that it is sometimes also called the Ornithine Cycle). Improper levels can cause disorders of the urea cycle, such as hyperornithinemia, hyperammonemia as well as other metabolic diseases such as gyrate atrophy and cancer. The name "ornithine" originates from the Greek word for bird (ornis or ornith-) in reference to its discovery as a benzoate ester in chicken excrement, by Max Jaffe in 1877. It is a key substrate for the biosynthesis of proline, polyamines and citrulline, but as a non-essential amino acid it is not incorporated into proteins in humans. The moiety derived from ornithine is called ornithyl.
=== Potential pharmaceuticals === Currently there is no widespread use of cysteine proteases as approved and effective anthelmintics but research into the subject is a promising field of study. Plant cysteine proteases isolated from these plants have been found to have high proteolytic activities that are known to digest nematode cuticles, with very low toxicity. Successful results have been reported against nematodes such as Heligmosomoides bakeri, Trichinella spiralis, Nippostrongylus brasiliensis, Trichuris muris, and Ancylostoma ceylanicum; the tapeworm Rodentolepis microstoma, and the porcine acanthocephalan parasite Macracanthorhynchus hirundinaceus. A useful property of cysteine proteases is the resistance to acid digestion, allowing possible oral administration. They provide an alternative mechanism of action to current anthelmintics and the development of resistance is thought to be unlikely because it would require a complete change of structure of the helminth cuticle. In several traditional medicines, the fruits or latex of the papaya, pineapple and fig are widely used for treatment of intestinal worm infections both in humans and livestock.
=== Other methods and techniques === Prior to RSKSOP-175, the EPA used Method 3810 (1986), which before that was Method 5020. However, Method 3810 is still used by some laboratories. Other headspace GC methods include:
=== Generic names === EMP is provided as the sodium salt for oral administration, which has the generic names estramustine phosphate sodium (USANTooltip United States Adopted Name) and estramustine sodium phosphate (BANMTooltip British Approved Name, JANTooltip Japanese Accepted Name), and as the meglumine salt for intravenous administration, which has the generic name estramustine phosphate meglumine. The INNMTooltip International Nonproprietary Name is estramustine phosphate. The name estramustine phosphate is a contraction of estradiol normustine phosphate. EMP is also known by its former developmental code names Leo 299, Ro 21-8837, and Ro 21-8837/001.
Sources: en.wikipedia.org
Formation of additional capillaries and larger blood vessels (angiogenesis) is a major mechanism by which a cancer may help to enhance its own growth. Disorders of retinal capillaries contribute to the pathogenesis of age-related macular degeneration. Reduced capillary density (capillary rarefaction) occurs in association with cardiovascular risk factors and in patients with coronary heart disease.
-direction. The drift velocity is perpendicular to the direction of the electric field. For the radial electric field produced by the electrodes in a Penning trap, the drift velocity will precess around the axial direction with some frequency
==== Metabolism ==== Not many studies have been conducted on the biotransformation of bromazolam, mainly because this drug is relatively new. However, in a study of Wagmann et al. (2020), the biotransformation of bromazolam is studied in depth. The results of this study are described in the text below. Blood plasma and urine of two individuals suspected of taking bromazolam were analysed for bromazolam and its metabolites. Bromazolam was detected in all four of the samples. One of the urine samples contained 8 bromazolam metabolites these were: phenyl-hydroxy bromazolam, 4-hydroxy bromazolam, α-hydroxy bromazolam, α-4-dihydroxy bromazolam, bromazolam N-glucuronide, phenyl-hydroxy bromazolam glucuronide, α-hydroxy bromazolam glucuronide, and 4-hydroxy bromazolam glucuronide. In the blood plasma sample of the same individual only the three mono-hydroxylated metabolites were found. The urine of the other individual only contained two metabolites, which were also found in the other urine sample, and the blood plasma did not show any metabolite of bromazolam present in the body. A study where pooled human liver S9 fractions (pHLS9) were incubated with bromazolam was conducted. Seven, out of the eight urine, bromazolam metabolites were found in the pHLS9 samples. Phenyl-hydroxylated glucuronide bromazolam was not found in the pHLS9 samples. Several monooxygenases and glucuronosyltransferases have been screened, in vitro, for activity of the biotransformation of bromazolam.
=== Bone Morphogenetic Protein 1-like proteinases === In a study in 1996, Greenspan's lab showed that Bone Morphogenetic Protein 1 (BMP-1) is a protease responsible for the biosynthetic processing of the precursor protein procollagen I into type I collagen, the most abundant protein in the bodies of vertebrates. The lab also helped define the interactions of BMP1 with morphogens involved in dorsoventral patterning in early embryogenesis. They also were responsible, via various studies, for identifying and characterizing the other mammalian BMP1-like proteinases (BMP1-LPs), showing them to be a small family of proteases that activate and inactivate various growth factors, particularly a subset of the TGFβ superfamily; activate enzymes, such as lysyl oxidase, and biosynthetically process various extracellular structural macromolecules. In fact, the lab provided the preponderance of insights into biological roles of these extracellular proteases that are key to development and homeostasis and to ECM formation, and are important to formation of the cardiovascular system, wound healing, periodontal homeostasis and tooth development, and regulation of nodal Na+ channel clustering in formation of the nodes of Ranvier during neuronal development.
==== Pollination ==== Fertilization of the ovule occurs through wind pollination, via motile sperm, as in cycads, ferns, mosses, and algae. The sperm are large (about 70–90 μm) and are similar to the sperm of cycads, which are slightly larger. Ginkgo sperm were first discovered by the Japanese botanist Sakugoro Hirase in 1896. The sperm have a complex multi-layered structure, which is a continuous belt of basal bodies that form the base of several thousand flagella which have a cilia-like motion. The flagella/cilia apparatus pulls the body of the sperm forwards. The sperm have only a tiny distance to travel to the archegonia, of which there are usually two or three. Two sperm are produced, one of which successfully fertilizes the ovule. Fertilization of ginkgo ovules, and development of the embryos, occurs just before or after they fall from the tree in early autumn .
Sources: en.wikipedia.org
=== Sociological === Anorexia nervosa has been increasingly diagnosed since 1950; the increase has been linked to vulnerability and internalization of body ideals. People in professions where there is a particular social pressure to be thin (such as models and dancers) were more likely to develop anorexia, and those with anorexia have much higher contact with cultural sources that promote weight loss. Internet usage heavily leads to deep societal practices of the upkeep of slender body types. Thus leading many to have symptoms of body dissatisfaction and low body image satisfaction. This trend can also be observed for people who partake in certain sports, such as jockeys and wrestlers. There is a higher incidence and prevalence of anorexia nervosa in sports with an emphasis on aesthetics, where low body fat is advantageous, and sports in which one has to make weight for competition. Family group dynamics can play a role in the perpetuation of anorexia including negative expressed emotion in overprotective families where blame is frequently experienced among its members. In the face of constant pressure to be thin, often perpetuated by teasing and bullying, feelings of low self-esteem and self-worth can arise, including the perception that one is not "deserving" of food.
=== Caucus memberships === Congressional Shellfish Caucus (co-chair) House Hydrogen and Fuel Cell Coalition (co-chair) House Baltic Caucus Congressional Arts Caucus Afterschool Caucuses Black Maternal Health Caucus Congressional Equality Caucus Congressional NextGen 9-1-1 Caucus United States Congressional International Conservation Caucus Climate Solutions Caucus Congressional Ukraine Caucus Congressional Wildlife Refuge Caucus Blue Collar Caucus Congressional Blockchain Caucus Rare Disease Caucus
In biochemistry, flavin adenine dinucleotide (FAD) is a redox-active coenzyme associated with various proteins, which is involved with several enzymatic reactions in metabolism. A flavoprotein is a protein that contains a flavin group, which may be in the form of FAD or flavin mononucleotide (FMN). Many flavoproteins are known: components of the succinate dehydrogenase complex, α-ketoglutarate dehydrogenase, and a component of the pyruvate dehydrogenase complex. FAD exists in two common oxidation states, the fully oxidized form (FAD) and the fully reduced, dihydrogenated form, FADH2. Other oxidation states also exist, including the N-oxide and semiquinone states. FAD, in its fully oxidized form, accepts two electrons and two protons to become FADH2. The semiquinone (FADH·) can be formed by either reduction of FAD or oxidation of FADH2 by accepting or donating one electron and one proton, respectively. Some proteins, however, generate and maintain a super oxidized form of the flavin cofactor, the flavin-N(5)-oxide.
The effects included brightened colors, increased visual contrast, open-eye visuals like colors and patterns, pareidolia, increased significance of objects, enhanced music appreciation, feeling intoxicated, self-analysis, insights, increased body awareness, feelings of joy, happiness, and peacefulness, feeling hyper and energized, feelings of empathy, things feeling ridiculous, humor and laughter, religious feelings, restlessness, social discomfort and avoidance, and nausea, among others. Mescaline was one of Shulgin's "magical half-dozen" psychedelic drugs in PiHKAL. Prominence of color with mescaline is distinctive, appearing brilliant and intense. Recurring visual patterns observed during the mescaline experience include stripes, checkerboards, angular spikes, multicolor dots, and very simple fractals that can turn very complex. The English writer Aldous Huxley described these self-transforming amorphous shapes as like animated stained glass illuminated from light coming through the eyelids in his autobiographical book The Doors of Perception (1954). Like LSD, mescaline induces distortions of form and kaleidoscopic experiences but they manifest more clearly with eyes closed and under low lighting conditions. Heinrich Klüver coined the term "cobweb figure" in the 1920s to describe one of the four form constant geometric visual hallucinations experienced in the early stage of a mescaline trip: "Colored threads running together in a revolving center, the whole similar to a cobweb". The other three are the chessboard design, tunnel, and spiral.
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, 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.