The short version of AEDG fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-15 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.
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
Discussions in the literature often conflate three distinct entities: the pineal extract epithalamin, the isolated tetrapeptide AEDG, and commercial preparations sold under similar names. Reviews citing older Russian-language studies sometimes omit detail on purity, route of administration and control groups, which makes cross-study comparison difficult. Researchers working with the compound generally note the need for independent replication, standardized enzyme assays, and clearer reporting of peptide identity. These caveats are relevant when weighing claims that appear in secondary sources rather than in primary reports.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
| 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 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.
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
The proposed relationship between epitalon and pineal function is a central part of its background. Khavinson's group reported that short peptides corresponding to regions of larger pineal proteins could influence gene expression in cells. Epitalon was framed as a synthetic analogue of an active fragment rather than a direct isolation product. Whether the tetrapeptide reproduces the effects of the parent extract is an open question, because comparative studies are limited and the parent extract itself is not a single defined substance.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
Although the following examples illustrate the diversity of point-mutation–mediated disorders, there are over 300,000 such mutations recorded in HGMD and over 1,000,000 variants in ClinVar, reflecting the vast spectrum of human point mutations.
The project was suggested to and given the green light by Mazda's Senior Managing Director Keiji Asano while he was on a trip to Indonesia in 1986. Sold alongside the seventh generation 323, an MR90 cost less than half the price of the newer model, but still more expensive than Toyota Kijang and Suzuki Carry "minibuses" as the country imposed 30% tax for saloons. In the past hatchback and wagon were classified as sedan Indonesia, but then revised as "minibus" in early 2000s. This changes boosting the sales of hatchbacks and started the downfall of sedans popularity in Indonesia.
The cause of Fukuyama congenital muscular dystrophy is rooted in the FKTN gene, located at human chromosome 9q31, encoding the protein fukutin. Mutations in this gene, and therefore the fukutin protein, are the cause of FCMD. The disease is inherited in an autosomal recessive manner. This means the defective gene responsible for the disorder is located on an autosome (chromosome 9 is an autosome), and two copies of the defective gene (one inherited from each parent) are required in order to be born with the disorder. The parents of an individual with an autosomal recessive disorder both carry one copy of the defective gene but usually do not experience any signs or symptoms of the disorder. Two mutations have been identified. The first and most common is an SVA retrotransposal insertion in the 3'-untranslated region. The second is a deep-intronic point mutation c.647+2084G>T. This second mutation has only been found to date in the presence of the first mutation.
Sources: en.wikipedia.org
==== Dentistry ==== In the United States, tranexamic acid is FDA-approved for short-term use in people with severe bleeding disorders who are about to have dental surgery. Tranexamic acid is used for a short period before and after the surgery to prevent major blood loss and decrease the need for blood transfusions. Tranexamic acid is used in dentistry in the form of a 5% mouth rinse after extractions or surgery in patients with prolonged bleeding time; e.g., from acquired or inherited disorders. In China, tranexamic acid is allowed in over-the-counter toothpaste, with six products using the drug. As of 2018, there are no limits on dosage, nor requirements for labeling the concentration. 0.05% TXA in toothpaste is allowed OTC in Hong Kong. <5% TXA in over-the-counter toothpaste is first patented and marketed by Lion Corporation in Japan, where it is still sold. Presence of unauthorized TXA has led to the Canadian recall of a Yunnan Baiyao toothpaste in 2019.
The Gulf War was notable for some of the first large-scale uses of precision-guided munitions, and stealth aircraft, via the Lockheed F-117 Nighthawk. Analysts refer to it as the "first space war" for the US usage of satellite-based reconnaissance, communications, and navigation. Precision-guided munitions, informally "smart bombs", were heralded as key in allowing military strikes to be made with a minimum of civilian casualties compared to previous wars, although they were not used as often as more traditional, less accurate bombs. Specific buildings in downtown Baghdad could be bombed while journalists in their hotels watched cruise missiles fly by. Precision-guided munitions amounted to approximately 7.4% of all bombs dropped by the coalition. Other bombs included cluster bombs, which disperse numerous submunitions, and daisy cutters, 15,000-pound bombs which can disintegrate everything within hundreds of yards. Global Positioning System (GPS) units were relatively new at the time and were important in enabling coalition units to easily navigate across the desert. Since military GPS receivers were not available for most troops, many used commercially available units. To permit these to be used to best effect, the "selective availability" feature of the GPS system was turned off for the duration of Desert Storm, allowing these commercial receivers to provide the same precision as the military equipment. Airborne Warning and Control System (AWACS) and satellite communication systems were also important.
=== Other functions === Other typical functions of tau include cellular signalling, neuronal development, neuroprotection and apoptosis. Atypical, non-standard roles of tau are also under current investigation, such as its involvement in chromosome stability, its interaction with the cellular transcriptome, its interaction with other cytoskeletal or synaptic proteins, its involvement in myelination or in brain insulin signaling, its role in the exposure to chronic stress and in depression, etc.
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 synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, often abbreviated AEDG. The molecule is linear and contains no modified residues, so it is fully described by its sequence.