synthetic heptapeptide comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-07-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Seven-residue peptide |
| Molecular mass | 813.9 Da | Monoisotopic value |
| Appearance | White to off-white powder | Lyophilized form |
| Solubility | Freely soluble in water | Also soluble in saline and polar solvents |
| Storage (dry) | -20 °C or lower | Desiccated, protected from light |
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
The compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
==== Fatal outcomes in case reports ==== A 2017 case report details the severe, prolonged episode of drug-induced parkinsonism in a 68‑year‑old man in the United States that ultimately led to his death roughly five months after receiving two injections of paliperidone palmitate (234 mg followed one week later by 156 mg). The authors state that "practitioners should be cognizant of the potential long‑term consequences of paliperidone LAI." A 47‑year‑old man (Japan, 2017) developed acute and persistent circulatory failure after receiving paliperidone palmitate injections. Despite surgical removal of the hip tissue suspected of containing the paliperidone palmitate depot, he died of multiple organ failure. When examining the removed tissue, it seemed that paliperidone palmitate was not present, and Janssen, the drug manufacturer, does not recommend this approach since it is practically impossible to locate the depot of paliperidone. The optimal treatment of long‐acting injectable (LAI) antipsychotic poisonings is unknown. In 2019, it was reported that a 33-year-old man in France was found dead in his room at his parents' home after receiving a single 819 mg injection of Trevicta (paliperidone palmitate three‑monthly formulation). Toxicological analysis of femoral blood revealed paliperidone at 240 μg/L; no other substance was detected. The authors concluded that paliperidone poisoning was the highly likely cause of death.
=== Other live performances === Clipse performed at the DuSable Black History Museum in Chicago, Illinois on August 24, 2024, for the Pepsi Dig In Day Block Party—a free event celebrating Black-owned restaurants. Clipse performed "Ace Trumpets" on June 26, 2025, for A Colors Show—a live performance series by German media company ColorsxStudios. Audio of the performance was released as a single on streaming services the same day. They performed an NPR Tiny Desk concert on July 11, concurrently with the album's release. A few days later, on July 15, they performed "The Birds Don't Sing" on The Tonight Show Starring Jimmy Fallon. During 2025 Jubilee, the "World Meeting on Human Fraternity 2025" took place on the St. Peter's Square at the Vatican City on 12 and 13 September, with concert of Andrea Bocelli, Pharrell Williams with the gospel choir Voices of Fire, and John Legend. Clipse performed the song "The Birds Don't Sing" along with John Legend at the second date during the Grace For The World concert on September 13, making history for being the first rappers to ever perform at the Vatican City. The duo performed "So Be It" on Jimmy Kimmel Live! in October 2025.
An interstellar probe proposal from 1999 suggested using three advanced radioisotope power sources (ARPS). The RTG electricity can be used for powering scientific instruments and communication to Earth on the probes. One mission proposed using the electricity to power ion engines, calling this method radioisotope electric propulsion (REP). A power enhancement for radioisotope heat sources based on a self-induced electrostatic field has been proposed. According to the authors, enhancements of 5-10% could be attainable using beta sources.
(CH2CH2)O + C2H5OH → HO–CH2CH2–OC2H5 2 (CH2CH2)O + C2H5OH → HO–CH2CH2–O–CH2CH2–OC2H5 Reactions with lower alcohols occur less actively than with water and require more severe conditions, such as heating to 160 °C (320 °F) and pressurizing to 3 MPa (440 psi) and adding an acid or alkali catalyst. Reactions of ethylene oxide with fatty alcohols proceed in the presence of sodium metal, sodium hydroxide, or boron trifluoride and are used for the synthesis of surfactants.
Sources: en.wikipedia.org
== Regulators == Three general classes of regulators of Rho protein signaling have been identified: guanine nucleotide exchange factor (GEFs), GTPase-activating proteins (GAPs) and guanine nucleotide dissociation inhibitors (GDIs). GEFs activate Rho proteins by catalyzing the exchange of GDP for GTP. GAPs control the ability of the GTPase to hydrolyze GTP to GDP, controlling the natural rate of movement from the active conformation to the inactive conformation. GDI proteins form a large complex with the Rho protein, helping to prevent diffusion within the membrane and into the cytosol and thus acting as an anchor and allowing tight spatial control of Rho activation. In human, 82 GEF (71 Dbl-like and 11 DOCK-like ) control positively the activity of Rho members, while 66 GAP proteins control it negatively. Recent work has unveiled important additional regulatory mechanisms: microRNAs regulate post-transcriptional processing of Rho GTPase-encoding mRNAs; palmitoylation and nuclear targeting affect intracellular distribution; post-translational phosphorylation, transglutamination and AMPylation modulate Rho GTPase signaling; and ubiquitination controls Rho GTPase protein stability and turnover. These modes of regulation add to the complexity of the Rho GTPase signaling network and allow precise spatiotemporal control of individual Rho GTPases.
=== Reported end of outbreak: August–September 2022 === On 5 August 2022, the country reported that it had not seen a fever case for seven consecutive days, and that every fever case had recovered. On 8 August, plans were announced to convene the Supreme People's Assembly in September, moving its members out of isolation. A separate review meeting to discuss a "change in direction" in pandemic response was also announced. On 11 August, Kim Jong Un's sister, Kim Yo Jong, stated that her brother had had a fever, implying that he had COVID-19 at one point. She also blamed South Korea for the COVID-19 outbreak in the country, claiming that it sent contaminated anti-Pyongyang leaflets to spread the disease. North Korean media reports indicate that the population have resumed regular activity. On August 25, several sources told NK News that North Korea could possibly allow foreigners into North Korea for the first time since 2020, likely after the 20th National Congress of the Chinese Communist Party later in 2022. In September, however, Kim Jong Un flagged the first rollout of vaccines in November and warned that COVID-19 could reappear in the winter months. The mass vaccination program started in the border areas in late September, making North Korea the last country in the world other than Eritrea to have a mass vaccination program against COVID-19.
The company's continued presence in Russia stands in stark contrast to the actions of many of its Western counterparts, who have pulled out or scaled down their operations to align with global sanctions and the broader call for economic isolation of Russia. As the conflict in Ukraine rages on, Dr. Reddy's decision to remain in Russia raises serious concerns about the ethical implications of doing business with a country under international sanctions, while the rest of the world seeks to hold Russia accountable for its actions. Other viewpoints, particularly those outside the European and American centric western viewpoint, take the position that denying life saving pharmaceutical treatment by seeking to stop the flow of pharmaceutical goods to the common people in those countries whose actions are perceived as hostile, violent and inappropriate, such as Russia, is a deeply immoral act, and that by continuing to provide lifesaving medication to everyday citizens who have no connection to their government's foreign policy Dr. Reddy is acting in a deeply ethical way.
Wood pulp made from birch gives relatively long and slender fibres for a hardwood. The thin walls cause the fibre to collapse upon drying, giving a paper with low bulk and low opacity. The birch fibres are, however, easily fibrillated and give about 75% of the tensile strength of softwood. The low opacity makes it suitable for making glassine. In India, the birch (Sanskrit: भुर्ज, bhurja) holds great historical significance in the culture of North India, where the thin bark coming off in winter was extensively used as writing paper. Birch paper (Sanskrit: भुर्ज पत्र, bhurja patra) is exceptionally durable and was the material used for many ancient Indian texts. The Roman period Vindolanda tablets also use birch as a material on which to write and birch bark was used widely in ancient Russia as notepaper (beresta) and for decorative purposes and even making footwear (lapti) and baskets.
The scope of these studies differs depending on the research question being addressed, the geographical coverage and the hidden impacts to be included in the analysis. There are many hidden impacts and some are difficult to measure or quantify. For example, environmental externalities such GHG emissions are easy to include in any TCA analysis due to a wide availability of relevant data. However, the hidden impacts related to human and social capitals might be more difficult to find. Examples include impacts on working conditions (human capital) and cultural identity (social capital). In 2019, a study by the World Bank estimated the hidden costs of foodborne diseases (from unsafe food) in low and middle-income countries and found these to amount to USD 95.2 billion.
Sources: en.wikipedia.org
It is a synthetic peptide of seven amino acids. Its backbone corresponds to a fragment of adrenocorticotropic hormone extended at the carboxyl end. The material is distributed as a lyophilized solid for laboratory use.
The extension was introduced to slow enzymatic breakdown of the peptide in biological systems. Natural ACTH fragments are degraded rapidly by peptidases. Adding the tripeptide was intended to extend the window during which the molecule remains intact.
Most published work consists of animal experiments conducted in a small number of laboratories. Human data are limited in number and size. Whether the observed effects translate into reliable clinical benefit is still unresolved.
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.