AEDG raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-05-16. Anything still debated is marked as such rather than presented as settled.
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 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.
The most frequently cited proposed action is induction of telomerase, the enzyme that adds repeat sequences to chromosome ends. Cell-culture work from the originating group reported higher telomerase reverse transcriptase expression and measurable telomere elongation in human somatic cells after exposure. How a four-residue peptide would reach nuclear gene regulation is not established, and no cell-surface receptor or uptake route has been identified. Additional reports describe changes in melatonin secretion, antioxidant enzyme activity and lipid peroxidation in aged animals, but these findings remain mechanistically unconnected to the telomerase observation.
| 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 |
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.
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.
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.
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.
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.
==== Juan Alberto Kessel Linares and Viñas Alonso arrested ==== On July 4, 2025, agents from the State Security Unit issued summons to Acting Grand Mater Kessel Linares and Acting Grand Secretary Víctor Bravo Cabañas at the Picota Police Station, where they were again officially arrested by Lieutenant Colonel Kenia María Morales Larrea, but they were later released with warning notices. Filema Duarte called a special session of the High Chamber to occur on July 6. Many Cuban Freemasons considered this an illegal act, because they had voted him out of office, and believed that he did not have the authority to call sessions. After they were released, Kessel Linares and Bravo Cabañas both posted to Facebook that they were concerned about the intimidation tactics used by the government, and called for a peaceful demonstration on July 6.
=== Early 20th century === Developmental bioelectricity work began in earnest at the beginning of the 20th century. Ida H. Hyde studied the role of electricity in the development of eggs. T. H. Morgan and others studied the electrophysiology of the earthworm. Oren E. Frazee studied the effects of electricity on limb regeneration in amphibians. E. J. Lund explored morphogenesis in flowering plants. Libbie Hyman studied vertebrate and invertebrate animals. In the 1920s and 1930s, Elmer J. Lund and Harold Saxton Burr wrote multiple papers about the role of electricity in embryonic development. Lund measured currents in a large number of living model systems, correlating them to changes in patterning. In contrast, Burr used a voltmeter to measure voltage gradients, examining developing embryonic tissues and tumors, in a range of animals and plants. Applied electric fields were demonstrated to alter the regeneration of planarian by Marsh and Beams in the 1940s and 1950s, inducing the formation of heads or tails at cut sites, reversing the primary body polarity.
On 15 May, an armed mob, headed by François-Vincent Raspail, Auguste Blanqui, and Armand Barbès, and assisted by the proletariat-aligned Guard, attempted to overwhelm the Assembly, but were defeated by the bourgeois-aligned battalions of the National Guard. Meanwhile, the national workshops were unable to provide remunerative work for the genuine unemployed, and of the thousands who applied, the greater number were employed in aimless digging and refilling of trenches; soon even this expedient failed, and those for whom work could not be invented were given a half wage of 1 franc a day. On 21 June, Alfred de Falloux decided in the name of the parliamentary commission on labour that the workmen should be discharged within three days and those who were able-bodied should be forced to enlist in the armed forces.
The UK Independence Party, which had 500 council seats in 2014, loses the remainder of its councillors. Members of the RMT vote to renew the union's mandate to take strike action for a further six months. 5 May – Following the first conviction for trafficking for the purposes of organ removal in England and Wales, Nigerian senator Ike Ekweremadu is sentenced to nine years and eight months in prison after bringing a young street trader to the UK in order to procure his kidney for a transplant. The senator's wife and a doctor who also assisted in the plan are also sent to prison. 6 May Coronation of Charles III and Camilla: The Coronation takes place at Westminster Abbey, London, with the two-hour ceremony emphasising diversity and inclusion. There are contributions from several faiths, including Muslim, Jewish, Hindu, Buddhist and Sikh representatives, while elements of the ceremony are also held in the Welsh and Gaelic languages. Graham Smith, leader of the Republic pressure group, is arrested at a protest in Trafalgar Square prior to the coronation. 7 May Coronation of Charles III and Camilla: Coronation Big Lunch events take place across the country along with street parties in various locations. The Coronation Concert takes place at Windsor Castle. Officials at Westminster City Council say they are "deeply concerned" at the arrest of three women's safety volunteers hours before the Coronation. In response the Metropolitan Police says it "received intelligence" people "were planning to use rape alarms to disrupt the procession".
Spyrakis et al. relied on a workflow of MD simulations, fingerprints for ligands and proteins (FLAP) and linear discriminant analysis (LDA) to identify the best ligand-protein conformations to act as pharmacophore templates based on retrospective ROC analysis of the resulting pharmacophores. In an attempt to ameliorate structure-based drug discovery modeling, vis-à-vis the need for many modeled compounds, Hatmal et al. proposed a combination of MD simulation and ligand-receptor intermolecular contacts analysis to discern critical intermolecular contacts (binding interactions) from redundant ones in a single ligand–protein complex. Critical contacts can then be converted into pharmacophore models that can be used for virtual screening. An important factor is intramolecular hydrogen bonds, which are not explicitly included in modern force fields, but described as Coulomb interactions of atomic point charges. This is a crude approximation because hydrogen bonds have a partially quantum mechanical and chemical nature. Furthermore, electrostatic interactions are usually calculated using the dielectric constant of a vacuum, even though the surrounding aqueous solution has a much higher dielectric constant. Thus, using the macroscopic dielectric constant at short interatomic distances is questionable. Finally, van der Waals interactions in MD are usually described by Lennard-Jones potentials based on the Fritz London theory that is only applicable in a vacuum.
Sources: en.wikipedia.org
=== EC 1.5.98 With other, known, physiological acceptors === EC 1.5.98.1: ethylenetetrahydromethanopterin dehydrogenase EC 1.5.98.2: 5,10-methylenetetrahydromethanopterin reductase EC 1.5.98.3: coenzyme F420:methanophenazine dehydrogenase
The plantar fascia contributes to support of the arch of the foot by acting as a tie-rod, where it undergoes tension when the foot bears weight. One biomechanical model estimated it carries as much as 14% of the total load of the foot. In an experiment using cadavers, it was found that failure of the plantar fascia averaged at loads of 118±244 newtons (12 ± 25 kilograms-force; 27 ± 55 pounds-force). Failure most often occurred at the proximal attachment to the calcaneus, which is consistent with the usual location of symptoms (i.e., in plantar fasciitis). Complete rupture or surgical release of the plantar fascia leads to a decrease in arch stiffness and a significant collapse of the longitudinal arch of the foot. By modeling it was predicted such conditions would result in a 17% increase in vertical displacement and a 15% increase in horizontal elongation of the foot when it was loaded at 683 newtons (70 kgf; 154 lbf). Surgical release also significantly increases both stress in the plantar ligaments and plantar pressures under the metatarsal heads. Although most of the figures mentioned above are from either cadaver studies or investigations using models, they highlight the relatively large load the plantar fascia is subjected to while contributing to the structural integrity of the foot.
=== (1) Venom collection methods === Venom milking is the most simplistic way of collecting a venom sample. It usually involves a vertebrate animal (Typically a snake) to deliver a venomous bite into a container. Similarly, electrical stimulation can be used for invertebrate animal (Insects and arachnids) subjects. This practice has allowed for the discovery of the basic properties of venom and to understand the biological factors involved in venom production such as venom regeneration periods. Other methods involve post-mortem dissection of the venom glands to collect the required materials (Venom or tissue).
=== Women's rights === Bhutto Zardari is a strong advocate of "peaceful, progressive, prosperous, democratic Pakistan", what he calls his mother's vision. In an interview with the BBC, he said that his 2018 election campaign was to implement these principles. He is a strong supporter of women's empowerment and believes in empowering women and taking them on board in all matters is the sole guarantee of the country's progress. On the occasion of International Day of the Girl Child, the PPP chairman said that a future based on progress and prosperity could remain a dream without empowering girls and taking them on board in all matters. Bhutto Zardari acknowledged all those women who stepped forward in all sections of life and field while defeating many impediments at every level and social taboos. He specifically named Fatima Jinnah, Benazir Bhutto, Asma Jehangir, and Maryam Mukhtar. On 17 March 2019, Bhutto Zardari met with a delegation of women's rights activists led by Sheema Kirmani and assured his support for their cause. A statement released by Bhutto Zardari House later said that his party would not tolerate any offence against the struggle for gender equality and women's rights. The statement went further to read, "The PPP chairman extended his enduring support to the members of the Aurat March and its activists who are struggling for their genuine and legitimate rights as enshrined in the unanimous constitution of Pakistan." Bhutto Zardari has also advocated for the abolishment of child marriages in Pakistan.
Sources: en.wikipedia.org
== History and etymology == In 1840-1841, Carl Julius Fritzsche was able to extract and crystallize two acids from the products of reaction of indigo dye with caustic potash, which he called chrysanilic and anthranilic acids after their colors before purification (golden yellow and black respectively) and the plant anil (Indigofera suffruticosa). The former was identified as ortho-carboxy anil of indoxyl-2-aldehyde only in 1910 while the latter was identified as salicylamide already in 1843 by Cahours.
Linus Carl Pauling ( PAW-ling; February 28, 1901 – August 19, 1994) was an American chemist and peace activist. He published more than 1,200 papers and books, of which about 850 dealt with scientific topics. Scientific American called him one of the 20 greatest scientists of all time. For his scientific work, Pauling was awarded the Nobel Prize in Chemistry in 1954. For his peace activism, he was awarded the Nobel Peace Prize in 1962. He is one of five people to have won more than one Nobel Prize. Of these, he is the only person to have been awarded two unshared Nobel Prizes, and one of two people to be awarded Nobel Prizes in different fields, the other being Marie Curie. Pauling was one of the founders of the fields of quantum chemistry and molecular biology. His contributions to the theory of the chemical bond include the concept of orbital hybridisation and the first accurate scale of electronegativities of the elements. Pauling also worked on the structures of biological molecules, and showed the importance of the alpha helix and beta sheet in protein secondary structure. Pauling's approach combined methods and results from X-ray crystallography, molecular model building, and quantum chemistry. His discoveries inspired the work of James Watson, Francis Crick, Rosalind Franklin, and Maurice Wilkins on the structure of DNA, which in turn made it possible for geneticists to crack the DNA code of all organisms.
pork supply chain by 2022 and worked with its suppliers and The Humane Society of the United States (HSUS) to support implementation. While it pledged to publish progress reports in 2018 and 2020, none were released, and as of 2025, the company no longer maintains a public commitment to eliminate gestation crates. In 2013, the Dunkin' Donuts chain in Thailand used an advertisement that contained a photograph of a woman in black facepaint, in order to promote its new chocolate-flavored doughnuts. The company was criticized for the advertisement, with the Human Rights Watch calling it "bizarre and racist". The headquarters in the United States apologized for the advertisement. Nancy Lewis, in Canaan, Connecticut, began a petition in January 2014 to request that Dunkin' Donuts donate their unsold food to local shelters and food banks in her area after seeing her local shop regularly throwing away "large amounts" of unsold food. She said because the company has no official policy on the redistribution of its unsold food items to shelters or food banks, and employees are not allowed to take any home, many affiliates throw all of the goods away. In August 2024, a group of Trump supporters called for a boycott of Dunkin' Donuts for declining advertisements from Rumble for promoting right-wing populism. They also accused the company of being "woke". In January 2025, donut manufacturer FGF Brands, LLC recalled 2 million donuts for Listeria contamination, some of which were sold by Dunkin' Donuts.
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.
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.