Everything below concerns mass spectrometry. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-06-14. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analog of the tetrapeptide tuftsin |
| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Reported consistently across pharmacopoeial descriptions |
| Appearance | White to off-white lyophilized powder | Typical form of research-grade material |
| Solubility | Freely soluble in water | Aqueous buffers; poor in nonpolar solvents |
| Typical storage temperature | -20 degrees Celsius | Lyophilized powder; protect from moisture |
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.
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.
Characterization of Selank in a laboratory setting relies on standard peptide methods. Reverse-phase high-performance liquid chromatography separates the target from related impurities and provides a purity figure, commonly reported as 95 percent or higher. Mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, confirms the molecular mass and helps detect truncation or modification. Amino acid analysis can verify composition when a sequence-level check is needed. These techniques together establish identity and purity for a given lot.
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.
=== Drug interactions === Using 2 drugs at the same time can sometimes affect each other's fraction unbound. For example, assume that Drug A and Drug B are both protein-bound drugs. If Drug A is given, it will bind to the plasma proteins in the blood. If Drug B is also given, it can displace Drug A from the protein, thereby increasing Drug A's fraction unbound. This may increase the effects of Drug A, since only the unbound fraction may exhibit activity.
The effects of luvesilocin have been clinically studied. It was evaluated at doses of 5 to 40 mg (equivalent to ~4–32 mg 4-HO-DiPT) by subcutaneous injection in this study. The drug was specifically assessed in terms of modified Drug Effects Questionnaire (DEQ) ratings, Mystical Experience Questionnaire (MEQ) ratings, and adverse effects. The mean duration of the psychedelic experience after administration of luvesilocin at a dose of 30 mg was found to be 3.6 hours.
=== Gene therapy === Gene therapy for hemoglobinopathies was first trialled in 2014 on a single patient with sickle cell disease (a fault in the beta globin gene), and followed by clinical trials in which a number of patients with either sickle cell or beta thalassemia were successfully treated. Gene therapies work by first harvesting the patient's HSCs, then using CRISPR gene editing to modify their DNA in the laboratory. In parallel with this, the person with thalassemia disease undergoes a myeloablation procedure (a form of chemotherapy) to destroy the remaining HSCs in their bone marrow. The laboratory treated cells are then infused back into the patient where they colonise the bone marrow and eventually commence production of healthy blood cells. There are fewer risks from this procedure than from HSCT, since the transplanted cells are autologous having originated from the patient herself/himself. There are two approved forms of gene therapy for beta thalassemia. Betibeglogene autotemcel, sold under the brand name Zynteglo, is a gene therapy for the treatment for beta thalassemia which adds a healthy beta-globin gene to the HSCs. It was approved for medical use in the United States in August 2022. The procedure involves collecting hematopoietic stem cells (HSCs) from the affected person's blood. In the laboratory, these HSCs then have a new gene for T87Q-globin (a modified beta-globin) introduced to them using a lentiviral vector.
=== 1994–1996: Nagoya Grampus Eight === Shortly after his dismissal, Wenger travelled to the United Arab Emirates to attend a series of conferences held by FIFA. Wenger was a member of the football governing body's technical committee, responsible for analysing the 1994 World Cup, and made a presentation to coaches of emerging football nations. His speech was closely followed by Japanese delegates, whose country had invested millions into the restructuring of its football league system. Representatives of Toyota, the majority owner of Nagoya Grampus Eight soon met with Wenger and offered him the chance to become the club's manager. Wenger deliberated, even though the idea of working abroad appealed to him; negotiations between the two parties lasted for two months. In that time, he sought the advice of his closest friends and family, and flew to Japan to watch Nagoya Grampus' striker Gary Lineker make his final appearance before his professional retirement. In December 1994, Wenger agreed to become manager of Nagoya Grampus, on a two-year contract worth ¥75m annually.
Rourk's legislative platform emphasizes economic stability for working families, advocating for strengthening the Child Tax Credit, expanding technical workforce training and apprenticeships, and indexing the federal minimum wage to the cost of living. On healthcare, she favors a public option, permanently expanding Affordable Care Act (ACA) subsidies, and allowing Medicare to negotiate prescription drug price. Her broader policy priorities include fully funding public schools while opposing private school voucher expansions, establishing a federal accountability framework for AI data center infrastructure, and passing comprehensive immigration reform that combines border enforcement with an earned path to citizenship for law-abiding residents.
Sources: en.wikipedia.org
Hemoglobin is the principal determinant of the color of blood (hemochrome). Each molecule has four heme groups, and their interaction with various molecules alters the exact color. Arterial blood and capillary blood are bright red, as oxygen imparts a strong red color to the heme group. Deoxygenated blood is a darker shade of red; this is present in veins, and can be seen during blood donation and when venous blood samples are taken. This is because the spectrum of light absorbed by hemoglobin differs between the oxygenated and deoxygenated states. Blood in carbon monoxide poisoning is bright red, because carbon monoxide causes the formation of carboxyhemoglobin. In cyanide poisoning, the body cannot use oxygen, so the venous blood remains oxygenated, increasing the redness. There are some conditions affecting the heme groups present in hemoglobin that can make the skin appear blue – a symptom called cyanosis. If the heme is oxidized, methemoglobin, which is more brownish and cannot transport oxygen, is formed. In the rare condition sulfhemoglobinemia, arterial hemoglobin is partially oxygenated, and appears dark red with a bluish hue. Veins close to the surface of the skin appear blue for a variety of reasons. However, the factors that contribute to this alteration of color perception are related to the light-scattering properties of the skin and the processing of visual input by the visual cortex, rather than the actual color of the venous blood. Skinks in the genus Prasinohaema have green blood due to a buildup of the waste product biliverdin.
== External links == Media related to Electronic cigarettes at Wikimedia Commons "Tobacco/Nicotine and Vaping". National Institute on Drug Abuse (NIDA). 7 June 2021. Archived from the original on 6 June 2022.
European lawmaker Hannah Neumann said that during the ceasefire, the repression within Iran is getting worse, and criticized that diplomatic efforts have not included the rights of Iranian people. US senator Bill Cassidy said that the ongoing talks with Iran were to make sure that they would not be able to develop a nuclear weapon. Ahead of the negotiation process, Trump told reporters that the outcome of the negotiations did not matter to him because his country supposedly defeated Iran militarily already. The same night that the negotiations were occurring, he was at an Ultimate Fighting Championship (UFC) fight event with Secretary of State Marco Rubio; it is unknown whether Trump knew of the negative outcome of the negotiation round at the time. In a later congressional hearing, senator Jacky Rosen told Rubio that she was shocked to see that Rubio, as secretary of state, chose to accompany Trump for a party at the UFC instead of taking part in talks with Iran during the Islamabad talks with Vance. The day after the Islamabad and UFC events ended, Trump announced that he would immediately enact a naval blockade against Iran. In late April, after the first round of talks had already concluded, Iranian representatives wouldn't arrive for the anticipated second round of talks expected later in the month.
The goal of wound care is to promote an environment that allows a wound to heal as quickly as possible, with emphasis on restoring both form and function of the wounded area. Although optimal treatment strategies vary greatly depending on the specific cause, size, and age of a particular wound, there are universal principles of wound management that apply to all wounds. After a thorough evaluation is performed, all wounds should be properly irrigated and debrided. Proper cleansing of a wound is critical to prevent infection and promote re-epithelialization. Further efforts should be made to eliminate/limit any contributing factors to the wound (e.g. diabetes, pressure, etc.) and optimize the wound's healing ability (i.e. optimize nutritional status). The end goal of wound management is closure of the wound which can be achieved by primary closure, delayed primary closure, or healing by secondary intention, each of which is discussed below. Pain control is a mainstay of wound management, as wound evaluation, wound cleansing, and dressing changes can be a painful process.
=== Secondhand cannabis smoke === A 2022 study found that smoking cannabis using a bong can greatly increase background levels of fine particulate matter, a carcinogen, in an enclosed space such as a living room. After 15 minutes, mean levels of particulate matter were more than twice the Environmental Protection Agency hazardous air quality threshold, and after 140 minutes, the concentrations were four times greater than those generated by smoking tobacco using a cigarette or hookah. This suggests secondhand cannabis smoke from bongs may present a health risk to non-smokers.
Sources: en.wikipedia.org
Representatives Gary Peters (D-MI) and Iowa Republican Senator Joni Ernst emphasized the role of supply chain breakdowns and weak points in medication shortages. They also argued that U.S. "over-reliance" on foreign nations for key ingredients would lead to future shortages out of American control, especially for dependence on "foreign adversaries" and "bad actors", with China named as an example. Dr. Stephen Schondelmeyer further stated that while the number of pharmaceutical production facilities in the United States was cut in half since 2014, the numbers of pharmaceutical plants were steadily growing in several countries such as Taiwan, India, Israel, and China. He reported that China and India's conditions for pharmaceutical production were greatly enhanced by having less environmental regulations and cheaper labor.
== Structure == The Walker motifs are a telltale protein sequence motif for nucleotide binding and hydrolysis. Beyond this broad function, the Walker motifs can be found in almost all natural ATPases, with the notable exception of tyrosine kinases. The Walker motifs commonly form a Beta sheet-turn-Alpha helix that is self-organized as a Nest (protein structural motif). This is thought to be because modern ATPases evolved from small NTP-binding peptides that had to be self-organized. Protein design has been able to replicate the ATPase function (weakly) without using natural ATPase sequences or structures. Importantly, while all natural ATPases have some beta-sheet structure, the designed "Alternative ATPase" lacks beta sheet structure, demonstrating that this life-essential function is possible with sequences and structures not found in nature.
== History == 4-HO-NiPT was first described in the scientific literature, as a metabolite of 4-AcO-DiPT, in 2022. Subsequently, its synthesis was described in 2023 and its pharmacology was reported in 2024. The drug was reported as a possible novel designer drug online in 2022.
== History == In 1909 Minnie Evangeline Jordon established the first dental practice in the United States devoted only to pediatric patients. In 1925 she published the first textbook on pediatric dentistry, titled Operative Dentistry for Children. The first dental care brought to public school was Alfred Fones in 1914, which was near 6 decades after the first woman, Lucy Hobbs Taylor, who received a DDS.
Methemoglobinemia can be treated with supplemental oxygen and methylene blue. Methylene blue is given as a 1% solution (10 mg/ml) 1 to 2 mg/kg administered intravenously slowly over five minutes. Although the response is usually rapid, the dose may be repeated in one hour if the level of methemoglobin is still high one hour after the initial infusion. Methylene blue inhibits monoamine oxidase, and serotonin toxicity can occur if taken with an SSRI (selective serotonin reuptake inhibitor) medicine. Methylene blue restores the iron in hemoglobin to its normal (reduced) oxygen-carrying state. This is achieved by providing an artificial electron acceptor (such as methylene blue or flavin) for NADPH methemoglobin reductase (RBCs usually don't have one; the presence of methylene blue allows the enzyme to function at 5× normal levels). The NADPH is generated via the hexose monophosphate shunt. Genetically induced chronic low-level methemoglobinemia may be treated with oral methylene blue daily. Also, vitamin C can occasionally reduce cyanosis associated with chronic methemoglobinemia, and may be helpful in settings in which methylene blue is unavailable or contraindicated (e.g., in an individual with G6PD deficiency). Diaphorase (cytochrome b5 reductase) normally contributes only a small percentage of the red blood cell's reducing capacity, but can be pharmacologically activated by exogenous cofactors (such as methylene blue) to five times its normal level of activity.
Sources: en.wikipedia.org
Selank is a synthetic seven-amino-acid peptide modeled on tuftsin, a fragment of the immunoglobulin G heavy chain. It was designed in Russia to combine anxiolytic and immunomodulatory properties in one molecule.
The first four residues of Selank reproduce the tuftsin sequence Thr-Lys-Pro-Arg. A Pro-Gly-Pro extension at the C-terminus was added to slow enzymatic breakdown and extend residence time.
It holds marketing authorization in Russia, where nasal drop formulations are sold. No equivalent approval exists in the European Union, the United States, or most other countries.
The sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, written TKPRPGP in one-letter code. It combines the tetrapeptide tuftsin with a carboxyl-terminal Pro-Gly-Pro extension. This full sequence identifies the molecule more precisely than the research name.