A practical reference on AEDG: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-09-24 and is reviewed periodically as new material appears.
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.
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.
The compound is generally described as a synthetic analogue of a fragment isolated from a pineal gland extract. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology introduced it during the 1980s and 1990s while studying short peptides from animal tissue. The original extract, called epithalamin, is a heterogeneous mixture, whereas epitalon is a single defined sequence. That distinction matters because findings reported for the extract are not automatically findings about the pure tetrapeptide, and claims about broader biological effects remain a separate question from the chemical identity described here.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Free acid form of the tetrapeptide |
| Molecular mass | About 390.35 Da | Calculated monoisotopic value |
| Appearance | White to off-white powder | Typical lyophilized presentation |
| Solubility | Soluble in water | Also dissolves in buffered saline |
| Storage temperature | Minus 20 degrees Celsius | Dry, dark conditions; avoid repeated thawing |
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.
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.
Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale (also called "stratum germinativum") Blood capillaries are found beneath the epidermis and are linked to an arteriole and a venule. Arterial shunt vessels may bypass the network in ears, the nose and fingertips.
=== Succinate-CoA ligase === Succinate-CoA ligase is a heterodimer composed of an invariant α-subunit and a substrate-specific ß-subunit, encoded by either SUCLA2 or SUCLG2. This combination results in either an ADP-forming succinate-CoA ligase (A-SUCL, EC 6.2.1.5) or a GDP-forming succinate-CoA ligase (G-SUCL, EC 6.2.1.4). The ADP-forming succinate-CoA ligase is potentially the only matrix enzyme generating ATP in the absence of a proton motive force, capable of maintaining matrix ATP levels under energy-limited conditions, such as transient hypoxia.
In 1974, Torbert left NRPS; he and Matthew Kelly co-founded the band Kingfish (best known for Bob Weir's membership during the Grateful Dead's late-1974 to mid-1976 touring hiatus) the year before. Initially he was replaced by Skip Battin (formerly of Skip & Flip and the early 1970s lineup of The Byrds), who briefly emerged as the dominant creative force in the band due to his prolific songwriting collaboration with controversial Hollywood impresario Kim Fowley. Stephen A. Love of Rick Nelson's Stone Canyon Band and the Roger McGuinn Band replaced Battin after he left the group to co-found a reconstituted lineup of The Flying Burrito Brothers in 1976. Shortly thereafter, Spencer Dryden relinquished his performance duties to manage the group in 1977. His musical replacement was Patrick Shanahan. Allen Kemp joined on bass in 1978 before emerging as a co-frontman on guitar and vocals, contributing prominently to the songwriting for the band's last major label release, 1981's Feelin' All Right. In 1982, Nelson and Cage left the band, leaving Dawson as the sole remaining member from the classic lineup.
Sources: en.wikipedia.org
Adiponectin enhances insulin sensitivity primarily though regulation of fatty acid oxidation and suppression of hepatic glucose production. Adiponectin is secreted into the bloodstream, where it accounts for about 0.01% of all plasma protein at around 5-10 μg/mL. In adults, plasma concentrations are higher in females than males, and are reduced in diabetics compared to nondiabetics. Weight reduction significantly increases circulating concentrations. Adiponectin automatically self-associates into larger structures. Initially, three adiponectin molecules bind together to form a homotrimer. The trimers continue to self-associate and form hexamers or dodecamers. Like the plasma concentration, the relative levels of the higher-order structures are sexually dimorphic, where females have increased proportions of the high-molecular-weight forms. Recent studies showed that the high-molecular-weight form may be the most biologically active form regarding glucose homeostasis. High-molecular-weight adiponectin was further found to be associated with a lower risk of diabetes with similar magnitude of association as total adiponectin. However, coronary artery disease has been found to be positively associated with high molecular weight adiponectin, but not with low molecular weight adiponectin. Adiponectin exerts some of its weight-reduction effects via the brain. This is similar to the action of leptin; adiponectin and leptin can act synergistically. Adiponectin promoted synaptic and memory function in the brain. Humans with lower levels of adiponectin have reduced cognitive function.
This has been supported by several organizations, including the Multidisciplinary Association for Psychedelic Studies (MAPS), the Beckley Foundation, the Heffter Research Institute, and the Albert Hofmann Foundation, which exist to fund, encourage, and coordinate research into the medicinal and spiritual uses of LSD and related psychedelics. New clinical LSD experiments in humans started in 2009 for the first time in 35 years. As the drug is illegal in many areas of the world, potential medical uses have historically been difficult to study. Investigational uses of LSD include the treatment of alcoholism, anxiety, and depression, among other conditions. Another use is alleviation of anxiety in terminally ill cancer patients. A single dose of LSD may temporarily reduce alcohol abuse and some psychiatric symptoms, but evidence is limited and unreliable due to methodological flaws and unclear causation. In 2024, the FDA designated a form of LSD as a breakthrough therapy to treat generalized anxiety disorder which is being developed by MindMed. A study published by the Journal of the American Medical Association in September, 2025 explored the optimal dose of LSD to lower patients' anxiety. The study was conducted by the pharmaceutical company MindMed. The researchers compared how LSD doses of 25 μg, 50 μg, 100 μg, 200 μg, or placebo impacted anxiety scores among study participants. The results of the study found that 100 μg was the optimal dose to reduce anxiety among the studied patients.
=== Arts, sciences, and education === John DeCuir, 1936: art director and production designer Robert Bruce Merrifield, 1939: biochemist who won the Nobel Prize in Chemistry in 1984 for the invention of solid phase Peptide synthesis
Sources: en.wikipedia.org
Metabolic dysfunction–associated steatotic liver disease (MASLD), previously known as non-alcoholic fatty liver disease (NAFLD), is a type of chronic liver disease. This condition is diagnosed when there is excessive fat build-up in the liver (hepatic steatosis), and at least one metabolic risk factor. When there is also increased alcohol intake, the term MetALD, or metabolic dysfunction and alcohol associated/related liver disease is used, and differentiated from alcohol-related liver disease (ALD) where alcohol is the predominant cause of the steatotic liver disease. The terms non-alcoholic fatty liver (NAFL) and non-alcoholic steatohepatitis (NASH, now known as metabolic dysfunction associated steatohepatitis, MASH) have been used to describe different severities, the latter indicating the presence of further liver inflammation. MASLD may progress to MASH, with the risk of progression estimated as 7–35% per year. MASH may also regress to MASLD, especially with a healthy diet, exercise, and medications. Both MASLD and MASH have liver related complications such as cirrhosis, liver cancer, liver failure, as well as liver independent complications such as cardiovascular disease. These complications are much more common with MASH. Obesity and type 2 diabetes are strong risk factors for MASLD. Other risks include being overweight, metabolic syndrome (defined as at least three of the five following medical conditions: abdominal obesity, high blood pressure, high blood sugar, high serum triglycerides, and low serum HDL cholesterol), a diet high in fructose, and older age.
==== Divestiture of oil and gas interests ==== In 1993, Grace Drilling was sold to Nabors Loffland Drilling Company, a Nabors Industries subsidiary, for approximately $32 million, and Grace Petroleum Corporation was sold to an undisclosed buyer for $125 million, with its East Texas oilfields being sold to Samson Investment Company for $38 million. Grace agreed at that time to sell the following companies:
2024 United Kingdom riots: Two 12-year-old boys become the youngest people to be convicted following their involvement in the disorder. Figures show that 125 migrants crossed the English Channel in small boats. 13 August Banknotes featuring King Charles, with a face value of £78,430 and low serial numbers, are auctioned for £914,127 to raise money for charity. An inquest is held into the death of former England cricketer Graham Thorpe, who died from suicide after being struck by a train at a railway station. Data from the Office for National Statistics shows UK unemployment fell to 4.2% in the three months to June, down from 4.4% during the previous quarter. Ofgem approves a £3.4bn project for a subsea cable allowing renewable energy to be transported from Scotland to England more easily. 14 August Inflation is reported to have risen from 2% to 2.2%, the first increase during 2024. The predicted increase is largely a result of a smaller fall in gas and electricity prices in July when compared to July 2023. 2024 United Kingdom riots: A 53-year-old woman from Cheshire is sentenced to 15 months in prison after admitting sending a communication threatening death or serious harm over a Facebook post in which she suggested a mosque should "be blown up with the adults inside". Two men found in a burned-out car in Malmö, Sweden, are confirmed as two British men, Farooq Abdulrazak, 37, and Juan Cifuentes, 33, who went missing in July. Train drivers' union ASLEF is to ballot its members on a revised pay offer following negotiations with the Department for Transport.
Certain other inherited diseases are associated with an increased risk of developing soft-tissue sarcomas. For example, people with neurofibromatosis type I (also called von Recklinghausen disease, associated with alterations in the NF1 gene) are at an increased risk of developing soft-tissue sarcomas known as malignant peripheral nerve-sheath tumors. Patients with inherited retinoblastoma have alterations in the RB1 gene, a tumor-suppressor gene, and are likely to develop soft-tissue sarcomas as they mature into adulthood.
Sources: en.wikipedia.org
Epitalon is a synthetic tetrapeptide built from four amino acids: alanine, glutamate, aspartate, and glycine. It is not extracted from a natural source but made in the laboratory by chemical synthesis. Its short length makes it relatively straightforward to produce at high purity.
No naturally occurring free form of the peptide has been described. The four-amino-acid sequence can appear as a fragment within larger proteins, but that is not the same as the intact compound being present as a circulating molecule. Materials used in research are synthetic.
Purity is usually checked by reverse-phase high-performance liquid chromatography, which separates the target peptide from related impurities. Mass spectrometry is commonly used alongside it to confirm molecular mass. Some suppliers also provide amino acid analysis for additional sequence confirmation.
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.