AEDG is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-01-26. Numbers and descriptions here follow the published literature rather than marketing material.
Residue composition is the property that most cleanly separates verified material from mislabelled samples. Alanine, glutamate, aspartate and glycine appear in that order from the N-terminus, and the two acidic residues sit in the middle of the chain. Because the peptide is short, it can be produced by solid-phase synthesis and characterised by mass spectrometry without ambiguity. Any reported sample whose measured mass departs substantially from 390 daltons is a different compound or a degraded mixture rather than epitalon.
Epitalon is a synthetic tetrapeptide whose four residues are alanine, glutamate, aspartate and glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9 and its monoisotopic mass is near 390.35 daltons. The peptide carries two acidic side chains, so it is neutral to negatively charged in most aqueous buffers. Published reference summaries usually list it under both spellings, epitalon and epithalon, and treat the two names as the same material.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four constituent residues |
| Molecular mass | About 390.35 Da | Monoisotopic value, confirmed by mass spectrometry |
| Residue sequence | Ala-Glu-Asp-Gly | Read from the N-terminus to the C-terminus |
| Common synonyms | Epithalon; AEDG | Both forms appear in reference catalogues |
| Net charge near neutral pH | Negative | Two acidic side chains give a low isoelectric point |
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and its calculated monoisotopic mass is approximately 390.35 daltons. The compound does not occur naturally as a free peptide; it is produced by solid-phase peptide synthesis. Because it contains two acidic residues and no basic residues, the neutral form carries a net negative charge at physiological pH. This charge profile influences how the peptide behaves in solution and during chromatographic analysis.
Laboratory-grade epitalon is typically supplied as a lyophilized powder. Purity is commonly assessed with reverse-phase high-performance liquid chromatography, often paired with mass spectrometry to confirm molecular identity. Amino acid analysis and peptide mapping can provide additional confirmation of sequence. Certificates of analysis for research materials frequently report purity above 95 percent, although the methods behind such figures vary between suppliers. The absence of a pharmacopeial monograph means that no single standardized assay defines the compound, so reported results depend on the analytical protocol chosen.
Storage recommendations center on limiting moisture, heat, and light. The dry powder is generally kept at minus 20 degrees Celsius, and some suppliers recommend minus 80 degrees for long-term archival. Once dissolved, solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles, which can promote aggregation or degradation. Aqueous stability depends on pH and concentration, and buffered saline is often preferred over plain water for biological work. Stability data specific to epitalon remain limited, so general peptide-handling practices are applied by analogy rather than from product-specific validation.
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
Russian: музга, muzga "pool, puddle" Lithuanian: mazgoti and Latvian: mazgāt "to wash" Sanskrit: májjati "to drown" Latin: mergō "to dip, immerse" Prekmurje Slovene: müzga "marsh, swamp" In many Slavic countries, Moskov is a surname, most commonly in Russia, Bulgaria, Ukraine, and North Macedonia. In addition, similarly named places exist in Poland, such as Mozgawa. According to a Finno-Ugric hypothesis, the Merya and Muroma people—who were among the pre-Slavic tribes that inhabited the area—called the river Mustajoki ("Black River"), and the name of the river derives from this term. Other theories, having little or no scientific basis, are rejected by linguists. The Old Russian form of the city's name has been reconstructed as *Москы, *Mosky; hence the name was one of a few Slavic ū-stem nouns. As with other nouns of that declension, the name had been undergoing a morphological transformation during an early stage of the language's development; as a result, the first written references in the 12th century were to Московь, Moskovĭ (accusative case), Москви, Moskvi (locative case), and Москвe/Москвѣ, Moskve/Moskvě (genitive case). From the latter forms came the modern Russian form Москва, Moskva, which is a result of morphological generalization with numerous Slavic ā-stem nouns. The form Moskovĭ has left traces in other languages, including the following:
== Venom and apitherapy == The main component of bee venom responsible for pain in vertebrates is the toxin melittin; histamine and other biogenic amines may also contribute to pain and itching. In one of the alternative medical uses of honey bee products, apitherapy, bee venom has been used to treat arthritis and other painful conditions. All currently available evidence supporting this practice is either anecdotal, animal studies, or preliminary evidence, most of which has poor methodology. Apitherapy is not currently accepted as a viable medical treatment for any condition or disease; the risk of allergic reaction and anaphylaxis outweighs any benefits. According to the American Cancer Society, there is no scientific evidence that apitherapy or bee venom therapy can treat or change the course of cancer or any other disease. Clinical trials have shown that apitherapy is ineffective in treating multiple sclerosis or any other disease, and can exacerbate multiple sclerosis symptoms.
=== Reed valve === A reed valve is a check valve formed by a flexible flat sheet that seals an orifice plate. The cracking pressure is very low, the moving part has low mass allowing rapid operation, the flow resistance is moderate, and the seal improves with back pressure. These are commonly found in two stroke internal combustion engines as the air intake valve for the crankcase volume and in air compressors as both intake and exhaust valves for the cylinder(s). Although reed valves are typically used for gasses rather than liquids, the Autotrol brand of water treatment control valves are designed as a set of reed valves taking advantage of the sealing characteristic, selectively forcing open some of the reeds to establish a flow path.
Hemoglobin is an oxygen carrier that occurs in red blood cells and contributes their color, transporting oxygen in the arteries from the lungs to the muscles where it is transferred to myoglobin, which stores it until it is needed for the metabolic oxidation of glucose, generating energy. Here the hemoglobin binds to carbon dioxide, produced when glucose is oxidized, which is transported through the veins by hemoglobin (predominantly as bicarbonate anions) back to the lungs where it is exhaled. In hemoglobin, the iron is in one of four heme groups and has six possible coordination sites; four are occupied by nitrogen atoms in a porphyrin ring, the fifth by an imidazole nitrogen in a histidine residue of one of the protein chains attached to the heme group, and the sixth is reserved for the oxygen molecule it can reversibly bind to. When hemoglobin is not attached to oxygen (and is then called deoxyhemoglobin), the Fe2+ ion at the center of the heme group (in the hydrophobic protein interior) is in a high-spin configuration. It is thus too large to fit inside the porphyrin ring, which bends instead into a dome with the Fe2+ ion about 55 picometers above it. In this configuration, the sixth coordination site reserved for the oxygen is blocked by another histidine residue. When deoxyhemoglobin picks up an oxygen molecule, this histidine residue moves away and returns once the oxygen is securely attached to form a hydrogen bond with it.
== Response rates == The response rate is the percentage of patients on whom a therapy has some defined effect; for example, the cancer shrinks or disappears after treatment. When used as a clinical endpoint for trials of cancer treatments, this is often called the objective response rate (ORR). The FDA definition of ORR in this context is "the proportion of patients with tumor size reduction of a predefined amount and for a minimum time period." Another criterion is the clinical benefit rate (CBR), "the total number (or percentage) of patients who achieved a complete response, partial response, or had stable disease for 6 months or more". Each trial, for whatever illness or condition, may define what is considered a complete response (CR) or partial response (PR) to the therapy or intervention. Hence the trials report the complete response rate and the overall response rate which includes CR and PR. (See e.g. Response evaluation criteria in solid tumors, and Small-cell carcinoma treatment, and for immunotherapies, Immune-related response criteria.)
Sources: en.wikipedia.org
The term bioorthogonal chemistry refers to any chemical reaction that can occur inside of living systems without interfering with native biochemical processes. The term was coined by Carolyn R. Bertozzi in 2003. Since its introduction, the concept of the bioorthogonal reaction has enabled the study of biomolecules such as glycans, proteins, and lipids in real time in living systems without cellular toxicity. A number of chemical ligation strategies have been developed that fulfill the requirements of bioorthogonality, including the 1,3-dipolar cycloaddition between azides and cyclooctynes (also termed copper-free click chemistry), between nitrones and cyclooctynes, oxime/hydrazone formation from aldehydes and ketones, the tetrazine ligation, the isocyanide-based click reaction, and most recently, the quadricyclane ligation.
Owing to the Sorensens' involvement in firefighting, the interior decor of Firehouse Subs locations is inspired by fire stations, and often includes firefighter equipment and memorabilia. Each location features a custom mural, hand drawn and painted at the company's headquarters in Jacksonville, Florida. The murals reflect fire and police service unique to each restaurant's community or town. No two of the more than 1,200 murals painted are the same.
== Post-translational modifications == The POMC gene encodes a 285-amino acid polypeptide precursor that undergoes extensive, tissue-specific post-translational processing. This processing is primarily mediated by subtilisin-like prohormone convertases, which cleave the precursor at specific basic amino acid sequences—typically Arg-Lys, Lys-Arg, or Lys-Lys. In many tissues, four primary cleavage sites are utilized, resulting in the production of two major bioactive peptides: adrenocorticotrophin (ACTH), which is essential for normal steroidogenesis and adrenal gland maintenance, and β-lipotropin. However, the POMC precursor contains at least eight potential cleavage sites, and depending on the tissue type and the specific convertases expressed, it can be processed into up to ten biologically active peptides with diverse functions. Key processing enzymes include prohormone convertase 1 (PC1), prohormone convertase 2 (PC2), carboxypeptidase E (CPE), peptidyl α-amidating monooxygenase (PAM), N-acetyltransferase (N-AT), and prolylcarboxypeptidase (PRCP). In addition to proteolytic cleavage, POMC processing involves other post-translational modifications such as glycosylation and acetylation. The specific pattern of cleavage and modification is tissue-dependent. For example, in the hypothalamus, placenta, and epithelium, all cleavage sites may be active, generating peptides involved in pain modulation, energy homeostasis, immune responses, and melanocyte stimulation.
=== Rio de Janeiro === Beginning with rackets such as Jogo do Bicho, Rio de Janeiro has had many incidents of collusion among criminal organizations and social and political institutions. Following the military dictatorship, political tools originally used by the regime, such as the Cândido Mendes prison complex, created the first prison gangs in Rio in the late 1970s-early 1980s. With the subsequent cocaine boom in South America, these gangs would go on to unite or incorporate smaller street gangs and other groups, while also dominating the drug market and capitalizing off it within favela communities. Heightened tensions for control of these neighborhoods contributed to turf wars and new factions of organized crime forming.
Sources: en.wikipedia.org
=== Systemic use === Prednisolone is a corticosteroid drug with predominant glucocorticoid and low mineralocorticoid activity, making it useful for the treatment of a wide range of inflammatory and autoimmune conditions such as asthma, uveitis, pyoderma gangrenosum, rheumatoid arthritis, urticaria, angioedema, ulcerative colitis, pericarditis, temporal arteritis, Crohn's disease, Bell's palsy, multiple sclerosis, cluster headaches, vasculitis, acute lymphoblastic leukemia, autoimmune hepatitis, lupus, Kawasaki disease, dermatomyositis, post-myocardial infarction syndrome, and sarcoidosis. Prednisolone can also be used for allergic reactions ranging from seasonal allergies to drug allergic reactions. Prednisolone can also be used as an immunosuppressant for organ transplants. Prednisolone in lower doses can be used in cases of adrenal insufficiency due to Addison's disease.
Important anatomy in the abdomen includes the stomach, small bowel, colon, liver, spleen, pancreas, kidneys, spine, diaphragm, descending aorta, and other abdominal vessels and nerves. Gunshots to the abdomen can thus cause severe bleeding, release of bowel contents, peritonitis, organ rupture, respiratory compromise, and neurological deficits. The most important initial evaluation of a gunshot wound to the abdomen is whether there is uncontrolled bleeding, inflammation of the peritoneum, or spillage of bowel contents. If any of these are present, the person should be transferred immediately to the operating room for laparotomy. If it is difficult to evaluate for those indications because the person is unresponsive or incomprehensible, it is up to the surgeon's discretion whether to pursue laparotomy, exploratory laparoscopy, or alternative investigative tools. Although all people with abdominal gunshot wounds were taken to the operating room in the past, practice has shifted in recent years with the advances in imaging to non-operative approaches in more stable people. If the person's vital signs are stable without indication for immediate surgery, imaging is done to determine the extent of injury. Ultrasound (FAST) and help identify intra-abdominal bleeding and X-rays can help determine bullet trajectory and fragmentation. However, the best and preferred mode of imaging is high-resolution multi-detector CT (MDCT) with IV, oral, and sometimes rectal contrast.
Regarding the last quarter-century of the period outlined by Taylor, his American colleague, diplomatic historian Edward Mead Earle, argued: "During the quarter-century beginning about 1890, Europe and the Far East lived under a precarious balance of power with the result … that the world moved crazily from one crisis to another and finally to catastrophe". Earle concludes: "The balance of power may well land us all in crematory". The balance of power theory prepared catastrophe in 1939 as in 1914, wrote Clarence Streit in his famous Union Now. There is "no more sterile, illusory, fantastic, exploded and explosive peace policy than the balance of power." In 1953, Ernst B. Haas criticized balance of power theory, arguing that international relations works that used the concept were plagued with "philological, semantic, and theoretical confusion." Since 1945, the arguments of Streit and Earle has prevailed over that of Taylor. Atomic scientists launched an all-out attack on the balance-of-power concept:
Sources: en.wikipedia.org
It is a four-amino-acid peptide built from alanine, glutamate, aspartate and glycine in that order. Its formula is C14H22N4O9, and it is made by chemical synthesis rather than extracted from tissue. The synthetic peptide is a single defined molecule, unlike the pineal extracts it is often compared with.
No. The two spellings refer to the same tetrapeptide, and the difference reflects transliteration from Russian. Laboratories and catalogues use both forms interchangeably. The material is also indexed as AEDG, taken from the one-letter codes of its residues.
Epithalamin is a mixed preparation derived from animal pineal tissue and contains many peptides. Epitalon is one synthetic sequence chosen for study from that broader mixture. Statements about one do not transfer directly to the other.
It is a synthetic tetrapeptide built from alanine, glutamate, aspartate and glycine. The four residues are joined by standard peptide bonds, giving a linear chain rather than a branched structure.