The short version of peptide synthesis fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-02-19. Anything still debated is marked as such rather than presented as settled.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic heptapeptide | Analog of an ACTH fragment |
| Amino acid length | Seven residues | Met-Glu-His-Phe-Pro-Gly-Pro |
| Origin | Moscow, 1980s | Institute of Molecular Genetics |
| Approved regions | Russia and some neighboring states | Not cleared in Western markets |
| Common trade names | Multiple national brands | Sold as a nasal formulation |
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
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.
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。
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 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.
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.
==== Other ==== In the production of nodular graphite in cast iron. As an additive agent in conventional propellants. As a reducing agent to separate uranium and other metals from their salts. As a sacrificial (galvanic) anode to protect boats, underground tanks, pipelines, buried structures, and water heaters. Alloyed with zinc to produce the zinc sheet used in photoengraving plates in the printing industry, dry-cell battery walls, and roofing. Alloyed with aluminium with aluminium-magnesium alloys being used mainly for beverage cans, sports equipment such as golf clubs, fishing reels, and bows and arrows. Many car and aircraft manufacturers have made engine and body parts from magnesium. Magnesium batteries have been commercialized as primary batteries, and are an active topic of research for rechargeable batteries, such as magnesium sulfur batteries. In biodegradable magnesium implants.
== Other effects == In concert with the primary surface forces described above, there are several circumstantial effects in play. While the forces themselves each contribute to the magnitude of the adhesion between the surfaces, the following play a crucial role in the overall strength and reliability of an adhesive device.
== Human proteins == The table below shows the 11 known human OATPs. Note: Human OATPs are designated with capital letters, animal Oatps are designated with lower case letters. The 'SLCO' stands for their gene name; 'solute carrier organic anion.' Previous nomenclature using letters and numbers (e.g. OATP-A, OATP-8 is no longer used. The most well characterised human OATPs are OATP1A2, OATP1B1, OATP1B3 and OATP2B1. Very little is known about the function and characteristics of OATP5A1 and OATP6A1.
Sources: en.wikipedia.org
However, there were conflicting witness reports of the rapist's height, and Napper walked with a stoop. The IPCC said no police officer would face disciplinary action because they had all retired and one key senior detective had died. Criminal prosecutions were not considered.
BCN, also known as bicyclo[6.1.0]non-4-yne, is a copper-free click chemistry probe that enables highly efficient and completely orthogonal bioconjugation to complex macromolecules including peptides, nucleic acids and proteins, including monoclonal antibodies. The most recent and powerful application of this technology has been in the field of antibody-drug conjugates which results in targeted cancer therapeutics that have an improved therapeutic index, meaning they are more effective and better tolerated. BCN is well-suited for aqueous bioconjugations due to its high reactivity with its azide counterpart and its high hydrophilicity, relative to other metal-free click chemistry probes.
==== Anti-nRNP/anti-U1-RNP ==== Anti-nuclear ribonucleoprotein (anti-nRNP) antibodies, also known as anti-U1-RNP antibodies, are found in 30–40% of SLE. They are often found with anti-Sm antibodies, but they may be associated with different clinical associations. In addition to SLE, these antibodies are highly associated with mixed connective tissue disease. Anti-nRNP antibodies recognise the A and C core units of the snRNPs and because of this they primarily bind to the U1-snRNP. The immune response to RNP may be caused by the presentation of the nuclear components on the cell membrane in apoptotic blebs. Molecular mimicry has also been suggested as a possible mechanism for the production of antibodies to these proteins because of similarity between U1-RNP polypeptides and Epstein-Barr virus polypeptides.
Sources: en.wikipedia.org
==== Legislature ==== The U.S. Congress is a bicameral legislature made up of the Senate and the House of Representatives. The Senate has 100 members—two residents from each state and elected by that state's voters for a six-year term. The House of Representatives has 435 voting members, elected for a two-year term by the constituency of the congressional district in which they reside. District boundaries are generally drawn by state legislatures or redistricting commissions under state law. Every U.S. congressional district must be as nearly equal in population as practicable; each sends one representative to Congress. Election years for senators are staggered so that only one-third of them will be up for election every two years. U.S. representatives are all up for election at the same time every two years. The U.S. Congress makes federal law, declares war, has the power of the purse, and has the power of impeachment. The Senate gives advice and consent to the ratification of treaties by a two-thirds vote of senators present. One of the foremost non-legislative functions of Congress is the power to investigate and oversee the executive branch. Congressional oversight is usually delegated to committees and is facilitated by Congress' power to issue subpoenas. Much of the work of Congress is performed by a collection of committees, each appointed for a specific purpose or function. Committee membership is by tradition and statute bipartisan, but all committees are chaired by a member of the majority party, who sets the committee agenda.
== Advantages == LMMS is relatively simple to operate compared to other methods. Furthermore, its strengths include its ability to analyze biological materials to detect certain compounds (such as metals or organic materials).
Women who became pregnant within approximately six months of the final dose showed vaccine efficacy estimates between 57% and 86% against parasitaemia in pregnancy. Because malaria and HIV infections frequently overlap geographically, PfSPZ Vaccine has been studied in HIV-positive adults. A randomized, double-blind, placebo-controlled trial in Tanzania administered five intravenous doses to HIV-negative and well-controlled HIV-positive participants. The vaccine was safe in both groups, but protection against CHMI was observed only in HIV-negative individuals, with an estimated vaccine efficacy of 80% in HIV-negative adults and no measurable efficacy in the HIV-positive cohort. Serological profiling indicated that HIV infection did not markedly diminish the magnitude of antibody responses to key sporozoite antigens, although cellular correlates of protection appear impaired in HIV-positive individuals. Recent analyses have examined the immune targets associated with PfSPZ-induced protection. Whole-proteome antibody profiling in Tanzanian trial participants revealed that vaccination elicits a focused IgG and IgM response to a limited set of Plasmodium falciparum antigens, including circumsporozoite protein and several liver- and blood-stage proteins. A whole-genome sieve analysis of parasites obtained from vaccinated and placebo recipients in West African field trials identified distinct parasite polymorphisms associated with vaccine breakthrough infections.
Also in 2011, he produced Catherine Hardwicke's romantic horror film Red Riding Hood. Though it was named one of the ten worst films of 2011 by Time magazine, it had moderate box-office returns. Also that year, DiCaprio's Appian Way produced George Clooney's political drama The Ides of March, an adaptation of Beau Willimon's 2008 play Farragut North. In 2012, DiCaprio starred as plantation owner Calvin Candie in Quentin Tarantino's Spaghetti Western, Django Unchained. After reading the script, DiCaprio felt uncomfortable with the extent of racism portrayed in the film, but his co-stars and Tarantino convinced him not to sugarcoat it. While filming, DiCaprio accidentally cut his hand on glass, but continued filming, and Tarantino elected to use the take in the final product. The film received critical acclaim; a writer for Wired magazine commended him for playing a villainous role and found his performance "blood-chilling". The film earned DiCaprio a Golden Globe Award nomination for Best Supporting Actor. Django Unchained grossed $425 million worldwide on a production budget of $100 million. In January 2013, DiCaprio said he would take a long break from acting to "fly around the world doing good for the environment". That year, he had four releases as an actor and a producer. His first was in the role of millionaire Jay Gatsby in Baz Luhrmann's The Great Gatsby, an adaptation of F. Scott Fitzgerald's 1925 novel of the same name, co-starring Carey Mulligan and Tobey Maguire.
Sources: en.wikipedia.org
It originated at the Institute of Molecular Genetics in Moscow during the 1980s. The work was carried out by a Russian research group that specialized in peptide neuropharmacology.
It is registered as a medicine in Russia and has been used clinically there for decades. No regulatory agency in Western Europe or North America has approved it for any indication.
Semax corresponds to the four-to-ten fragment of adrenocorticotropic hormone. Because it omits the first three residues, it lacks the adrenal-stimulating action of the full hormone.
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.