This is a working overview of AEDG, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-01-17 and is reviewed periodically as new material appears.
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.
Stability depends strongly on pH, temperature and the presence of oxygen and trace metals. Cleavage of the backbone proceeds faster under neutral to alkaline conditions, whereas acidic solutions tend to slow that reaction. The aspartate and glutamate side chains can undergo deamidation or imide formation over time, generating closely related impurities. Published stability data specific to epitalon are sparse, so the usable life of a given solution is best regarded as an open question that depends on buffer composition, concentration and storage temperature.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography with ultraviolet detection, frequently near 214 nanometers where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the observed molecular mass and helps separate the intact peptide from truncated or modified forms. Amino acid analysis or tandem mass spectrometry can establish residue order. Purity is commonly quoted as an area percentage, yet such values are method-dependent, and comparisons between laboratories require matching column, gradient and detection wavelength.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
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.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
== Pokeweed antiviral protein == Pokeweed antiviral protein is a ribosome inactivating protein that provides pokeweed plants protection against both viral and fungal infections. It also protects other types of plants that have genetically engineered to express RAP that do not normally do so. Recombinant pokeweed antiviral protein has also been proposed as a treatment of human diseases such as AIDS and cancer.
moiety Any named characteristic group, branch, or other part of a large molecule that may be identified within other kinds of molecules as well. Functional groups are typically smaller and more generic than moieties, whereas substituents and side chains may often be classified as moieties and vice versa.
is the wealthiest country, with the highest disposable household income per capita among OECD members, though its wealth inequality is highly pronounced. American culture, shaped by centuries of immigration, is diverse and globally influential. The U.S. makes up nearly a third of global military spending and is widely considered to have the most powerful armed forces in the world. A member of numerous international organizations, it plays a dominant role in global political, cultural, economic, and military affairs.
== Aircraft == Labcorp (ICAO: SKQ, call sign: SKYLAB) utilizes a fleet of 12 Pilatus PC-12 and a single Pilatus PC-24 aircraft on nightly runs from Burlington for use on the East Coast. Prior to the acquisition of PC-12 aircraft Labcorp utilized seven PA-31-350s.
Sources: en.wikipedia.org
=== Thermal trauma === The sclera is rarely damaged by brief exposure to heat: the eyelids provide exceptional protection, and the fact that the sclera is covered in layers of moist tissue means that these tissues are able to cause much of the offending heat to become dissipated as steam before the sclera itself is damaged. Even relatively low-temperature molten metals when splashed against an open eye have been shown to cause very little damage to the sclera, even while creating detailed casts of the surrounding eyelashes. Prolonged exposure, however—on the order of 30 seconds—at temperatures above 45 °C (113 °F) will begin to cause scarring, and above 55 °C (131 °F) will cause extreme changes in the sclera and surrounding tissue. Such long exposures even in industrial settings are virtually nonexistent.
The cause is genetic mosaicism; that is, some of, or most of, the germ cells of one parent have a dominant form of OI, but not enough of their somatic cells do to cause symptoms or obvious disability in the parent—the parent's different cells have two (or more) sets of slightly different DNA. It has been clinically observed that ≈5–10% of cases of OI types II and III are attributable to genetic mosaicism.
== Characteristics == Krypton is characterized by several sharp emission lines (spectral signatures) the strongest being green and yellow. Krypton is one of the products of uranium fission. Solid krypton is white and has a face-centered cubic crystal structure, which is a common property of all noble gases (except helium, which has a hexagonal close-packed crystal structure).
==== Eyes ==== Rattlesnake eyes, which contain many rod cells, are well adapted to nocturnal use. Rattlesnakes, though, are not exclusively nocturnal, and their vision is more acute during daylight conditions. Rattlesnakes also possess cone cells, which means they are capable of some form of color vision. The rattlesnake eye lacks a fovea, making vision of sharply defined images impossible. Instead, they mostly rely on the perception of movement. Rattlesnake eyes are capable of horizontal rotation, but they do not appear to move their eyeballs to follow moving objects.
After his retreat, Liu established the "Ning-Ya-Kang Administrative Committee" in order to govern the areas still under his control. The Nationalist government would also follow suit in December 1934, creating a provincial establishment committee. Liu Wenhui was appointed by Nanjing as chairman of this committee: simultaneously, Liu Xiang was also named as the governor of Sichuan. It was officially formed in Ya'an in July 1935, and moved to Kangding in September 1936. Xikang was a poor region, isolated and rugged, and a reorganization by the Nationalists in 1936 would strip Liu of his rule over Ya'an and Xichang, which were turned over to Sichuan. The remaining lands were in such an impoverished state, with a population of barely 300,000 and a tax revenue of about 500,000 yuan, that Liu began to have trouble even securing food for the 24th Army. A desperate Liu Wenhui dispatched a mission to Nanjing to ask for his old territories back and for the central government to subsidize his budget; although Wang Jingwei was sympathetic to this idea, Chiang refused to grant him a bailout. Liu Xiang, the old rival of Liu Wenhui, likewise refused to return the regions he had just acquired, which stalled the plans to create an independent Xikang province. Respite for Liu would come in the form of the full-scale Japanese invasion of China, which forced the central government to move to Sichuan. More importantly, Liu Xiang would die from illness in 1938, clearing Sichuanese opposition to the Xikang project.
Sources: en.wikipedia.org
On a stained blood smear, platelets appear as dark purple spots, about 20% of the diameter of red blood cells. The smear reveals size, shape, qualitative number, and clumping. A healthy adult typically has 10 to 20 times more red blood cells than platelets.
=== 1988 === February 12, 1988 – Hostile rendezvous off coast of Crimea in Black Sea when the Soviet frigate Bezzavetnyy rammed the American missile cruiser USS Yorktown. February 20, 1988 – The regional soviet of Nagorno-Karabakh in Azerbaijan decides to be part of Armenia, but the Kremlin refuses to do it. The subsequent First Nagorno-Karabakh War would be the first of the internal conflicts in the Soviet Union that would become the post-Soviet separatist conflicts. August 8, 1988 – 8888 Uprising in Burma. August 17, 1988 – Pakistani president Muhammad Zia-ul-Haq dies. August 20, 1988 – End of Iran–Iraq War. September 17, 1988 – Summer Olympics in Seoul, South Korea; first time since 1976 that both Soviet Union and the United States participate; it is also the last Olympic Games for the Soviet Union and its satellite states. October 5, 1988 – Augusto Pinochet, dictator of Chile since September 1973, is defeated in a nationwide referendum. December 21, 1988 – Pan Am Flight 103 bombing.
==== Chemical uses ==== Water is widely used in chemical reactions as a solvent or reactant and less commonly as a solute or catalyst. In inorganic reactions, water is a common solvent, dissolving many ionic compounds, as well as other polar compounds such as ammonia and compounds closely related to water. In organic reactions, it is not usually used as a reaction solvent, because it does not dissolve the reactants well and is amphoteric (acidic and basic) and nucleophilic. Nevertheless, these properties are sometimes desirable. Also, acceleration of Diels-Alder reactions by water has been observed. Supercritical water has recently been a topic of research. Oxygen-saturated supercritical water combusts organic pollutants efficiently.
=== Ancient === 350 BCE — The Greek philosopher Aristotle, arguably the first philosopher to make a serious attempt to scientifically explain aging, proposes his thesis on aging. He suggests that aging is a process by which human and animal bodies, which are naturally hot and wet, gradually become dry and cold, and theorizes that more moisture delays aging. 259–210 BCE — years of life of the Chinese emperor Qin Shi Huang, who united China under his rule. All his life he persistently searched for an elixir of youth and died trying, presumably taking "pills of immortality", containing mercury. 156–87 BCE — years of life of the Chinese emperor Wu of Han, who persistently tried to find a way to achieve immortality, mainly by means of magic. He used services of various magicians. But Wu of Han was not a naive person – he thoroughly rechecked their abilities and if he identified the person as a quack, he executed him. 63 BC–14 CE — years of life of Caesar Augustus, the first Roman emperor, who is considered one of the most effective leaders of the Ancient Rome. For him an eternal youth was an obsession. In particular, contrary to the Roman tradition to create statues as realistic as possible, he always ordered to portray himself young. There are many of his "youthful" statues but researchers still do not know how he looked in old age. 3rd–17th century — the period of alchemy. There are several directions in alchemy, and it was distributed over a huge territory.
Sources: en.wikipedia.org
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.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
The dry powder is typically held at -20 degrees Celsius or lower, protected from light and moisture. Allowing a sealed vial to reach room temperature before opening reduces condensation on its contents. Conditions stated on a supplier certificate of analysis take precedence over general guidance.