If you have been reading about AEDG and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-06-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
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.
Published evidence comes mainly from Russian-language journals and from a single research group, with small sample sizes and limited independent replication. A few laboratories outside that group have examined related peptides and reported weaker or absent telomerase effects, so the central claim is best described as contested rather than settled. Rodent studies report modest changes in some ageing markers and in survival, but designs vary and control conditions are often sparse. No large randomised trial in humans has been published, and long-term safety data in healthy populations are correspondingly thin.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
| Property | Value | Notes |
|---|---|---|
| Amino acid sequence | Ala-Glu-Asp-Gly | Linear tetrapeptide, also written AEDG |
| Molecular mass | About 390.35 g/mol | Value calculated from the sequence |
| Appearance | White to off-white powder | Lyophilised material forms a loose cake |
| Solubility | Freely soluble in water | Also dissolves in isotonic saline |
| Storage | -20 °C, desiccated | Aliquot solutions to avoid freeze–thaw cycling |
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 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.
Epitalon is a synthetic tetrapeptide whose sequence is alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. It was developed in Russia during the 1980s and 1990s by investigators associated with the St. Petersburg Institute of Bioregulation and Gerontology, who studied short peptides as regulators of gene expression and tissue function. The alternative spelling epithalon appears interchangeably in the literature, and the two names refer to the same molecule. Outside Russia it is encountered chiefly as a research chemical rather than a licensed medicine, and it holds no approval from the United States Food and Drug Administration or the European Medicines Agency.
The peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
=== 11 June === The SAF announced its withdrawal from the Libya-Egypt-Sudan border triangle following attacks by the LNA and the RSF the previous day. Eight people were killed by RSF shelling in Abu Shouk IDP camp.
==== Maturation ==== Vocal fold structure in adults is quite different from that in newborns. Exactly how the vocal cord matures from an immature monolayer in newborns to a mature three layer tissue in adults is still unknown, however a few studies have investigated the subjects and brought some answers. Hirano et al. previously found that the newborns did not have a true lamina propria, but instead had cellular regions called maculae flavae, located at the anterior and posterior ends of the loose vocal fold tissue. Boseley and Hartnick examined the development and maturation of pediatric human vocal fold lamina propria. Hartnick was the first one to define each layer by a change in their cellular concentration. He also found that the lamina propria monolayer at birth and shortly thereafter was hypercellular, thus confirming Hirano's observations. By 2 months of age, the vocal fold started differentiating into a bilaminar structure of distinct cellular concentration, with the superficial layer being less densely populated than the deeper layer. By 11 months, a three-layered structure starts to be noted in some specimens, again with different cellular population densities. The superficial layer is still hypocellular, followed by an intermediate more hypercellular layer, and a deeper hypercellular layer, just above the vocalis muscle. Even though the vocal cords seem to start organizing, this is not representative of the trilaminar structure seen in adult tissues, where the layers are defined by their differential elastin and collagen fiber compositions.
Physical effects include increased heart rate, difficulty breathing, nausea, and behavioral problems in children whose mothers used cannabis during pregnancy; short-term side effects may also include dry mouth and red eyes. Long-term adverse effects may include addiction, decreased mental ability in those who started regular use as adolescents, heart disease, chronic coughing, susceptibility to respiratory infections, and cannabinoid hyperemesis syndrome. Cannabis is mostly used recreationally or as a medicinal drug, although it may also be used for spiritual purposes. Evidence supports only a few approved uses of cannabinoids and most medical claims, such as efficacy for insomnia or acute pain, lack sufficient evidence. In 2013, between 128 and 232 million people used cannabis (2.7% to 4.9% of the global population between the ages of 15 and 65). It is the most commonly used largely-illegal drug in the world, with the highest use among adults in Zambia, the United States, Canada, and Nigeria. Since the 1970s, the potency of illicit cannabis has increased, with THC levels rising and CBD levels dropping. Cannabis plants have been grown since at least the 3rd millennium BCE and there is evidence of it being smoked for its psychoactive effects around 500 BCE in the Pamir Mountains, Central Asia. Since the 14th century, cannabis has been subject to legal restrictions. The possession, use, and cultivation of cannabis has been illegal in most countries since the 20th century. Uruguay became the first country to legalize recreational use of cannabis in 2013.
=== Focus === Bhatt's research spans multiple areas of cardiovascular medicine, with an emphasis on interventional cardiology, acute coronary syndromes, stroke, and heart failure, as well as cardiometabolic risk factors such as dyslipidemia, diabetes, obesity, and chronic kidney disease. Profiles from professional organisations and bibliometric databases describe his work as focusing on clinical trials of antithrombotic agents, lipid-lowering therapies, and glucose-lowering drugs in high-risk cardiovascular populations. In addition to procedural and device-based interventional cardiology, he has co-authored professional society statements and guidelines in cardiology and stroke medicine, including recommendations on the early management of adults with ischaemic stroke that have been cited in subsequent American Heart Association and American Stroke Association documents. According to AD Scientific Index, he ranks among the top 0.1% percent of scientists worldwide in his field based on citation indicators.
Sucrose gradient centrifugation—a linear concentration gradient of sugar (typically sucrose, glycerol, or a silica-based density gradient media, like Percoll)—is generated in a tube such that the highest concentration is on the bottom and lowest on top. A protein sample is then layered on top of the gradient and spun at high speeds in an ultracentrifuge. This causes heavy macromolecules to migrate towards the bottom of the tube faster than lighter material. During centrifugation in the absence of sucrose, as particles move farther and farther from the center of rotation, they experience more and more centrifugal force (the further they move, the faster they move). The problem with this is that the useful separation range within the vessel is restricted to a small observable window. Spinning a sample twice as long does not mean the particle of interest will go twice as far; in fact, it will go significantly further. However, when the proteins are moving through a sucrose gradient, they encounter liquid of increasing density and viscosity. A properly designed sucrose gradient will counteract the increasing centrifugal force so the particles move in close proportion to the time they have been in the centrifugal field. Samples separated by these gradients are referred to as "rate zonal" centrifugations. After separating the protein/particles, the gradient is then fractionated and collected. In biochemistry, ultracentrifugation is valuable for separating biomolecules and analyzing their physical properties.
Sources: en.wikipedia.org
==== Germany ==== The Federal Office for Radiation Protection has developed a radon map of Germany. The EU Directive 2013/59/Euratom (Radiation Protection Basic Standards Directive) introduced reference levels and the possibility for workers to have their workplace tested for radon exposure. In Germany, it was implemented in the Radiation Protection Act (Chapter 2 or Sections 124-132 StrlSchG) § 124-132 StrlSchG (in German) and the amended Radiation Protection Ordinance (Part 4 Chapter 1, Sections 153-158 StrlSchV). § 153-158 Act of (in German) The new radon protection regulations for workplaces and new residential buildings have been binding since January 2019. Extensive radon contamination and radon precautionary areas have been determined by the ministries of the environment of the federal states (as of June 15, 2021).
SEA on/off concept exploits the redox properties of SEA group. Oxidation of SEA on results in a cyclic disulfide called SEA off, which is a self-protected form of SEA on. SEA off and SEA on can be easily interconverted by reduction/oxidation as shown in Scheme 2.
== Regulation == Post-translational modifications of prolidase regulate its enzymatic abilities. Phosphorylation of prolidase has been shown to increase its activity while dephosphorylation leads to a decrease in enzyme activity. Analysis of known consensus sequence required for serine/threonine phosphorylation revealed that prolidase contains at least three potential sites for serine/threonine phosphorylation. Nitric oxide, both exogenously acquired and endogenously generated, was shown to increase prolidase activity in a time- and dose-dependent manner via phosphorylation at these serine and threonine sites. Additionally, prolidase may also be regulated at tyrosine phosphorylation sites, which are mediated by FAK and MAPK signaling pathways.
== Personal life == Townsend was born in Leytonstone, Greater London. He is the son of Troy Townsend, Head of Development for Kick It Out. He is of paternal Jamaican and maternal Greek Cypriot descent. He was brought up in Chingford, and is a lifelong Tottenham fan. He attended Rush Croft Sports College. When Townsend was 10, his half-brother Kurtis died in a car accident, aged 18. One of his cousins is Colin Kazim-Richards, also a professional footballer. Townsend was filmed singing the song "Stand By Me" by Ben E. King with the rest of the Tottenham youth players in the dressing room, which became a popular internet video. Townsend said in a December 2019 interview that he had been a problem gambler, compulsively betting online on football. He lost £46,000 on a single bet in 2012 on the night before a play-off game for Birmingham. After being caught for breaking the FA's anti-betting rules, he went to counselling. In November 2023, while on a short-term contract with Luton Town, Townsend said he was trying to improve his fitness and prolong his career. He highlighted his consumption of chicken feet, which are high in collagen as a boost to his overall fitness. Townsend worked as a pundit and co-commentator for ITV during the 2022 World Cup, Euro 2024 and 2026 World Cup. In May 2026, Townsend posted a social media video questioning why people needed to wear sunglasses to protect their eyes from sunlight but not from artificial light.
Sources: en.wikipedia.org
=== Preliminary health research === Preliminary research remains sparse and inconclusive. In a 2015 systematic review, most of the studies did not show an effect of chia seed consumption on cardiovascular risk factors in humans.
During the first Trump administration, US president Donald Trump said that the United States should buy Greenland. The governments of Denmark and Greenland clarified that Greenland is not for sale and cannot be sold under the Danish constitution, and the Danish government has always rejected such proposals, which Prime Minister Mette Frederiksen called "an absurd discussion". Greenland invited American investment, however, stating that "we're open for business, not for sale". In December 2024, President-elect Trump, before the onset of his second administration, reiterated his interest in the United States assuming control of Greenland, stating that "for purposes of national security and freedom throughout the world, the United States of America feels that the ownership and control of Greenland is an absolute necessity."
As described above, macrophages play a key role in removing dying or dead cells and cellular debris. Erythrocytes have a lifespan on average of 120 days and so are constantly being destroyed by macrophages in the spleen and liver. Macrophages will also engulf macromolecules, and so play a key role in the pharmacokinetics of parenteral irons. The iron that is released from the haemoglobin is either stored internally in ferritin or is released into the circulation via ferroportin. In cases where systemic iron levels are raised, or where inflammation is present, raised levels of hepcidin act on macrophage ferroportin channels, leading to iron remaining within the macrophages.
Sources: en.wikipedia.org
It is a synthetic tetrapeptide. Its sequence was derived from research on peptide fractions of bovine pineal extract, and the intact AEDG sequence has not been demonstrated as an abundant free peptide in human tissue.
AEDG is the one-letter code for the four amino acids alanine, glutamate, aspartate and glycine in that order. The same molecule is written in three-letter form as Ala-Glu-Asp-Gly.
Identity is normally confirmed by mass spectrometry against the calculated mass of roughly 390.35 g/mol. Purity is then estimated by reversed-phase high-performance liquid chromatography with ultraviolet detection.
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.