AEDG comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-06-24. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
| 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 |
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
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.
Polyethersulfone (PES) is also referred to as polyetherketone and polysulfone. It is synthesized by nucleophilic aromatic substitution between aromatic dihalides and bisphenolate salts. Polyethersulfones are partially crystalline and highly resistant to a wide range of aqueous and organic environments. They are rated for continuous service at temperatures of 240–280 °C. The polyketones are finding applications in areas like automotive, aerospace, electrical-electronic cable insulation.
Every mission demonstrated the ability to adjust the crafts' inclination and apsis without issue. Gemini 5 demonstrated eight-day endurance, long enough for a round trip to the Moon. Gemini 7 demonstrated a fourteen-day endurance flight. Gemini 6A demonstrated rendezvous and station-keeping with Gemini 7 for three consecutive orbits at distances as close as 1 foot (0.30 m). Gemini 9A also achieved rendezvous with an Agena Target Vehicle (ATV). Rendezvous and docking with the ATV was achieved on Gemini 8, 10, 11, and 12. Gemini 11 achieved the first direct-ascent rendezvous with its Agena target on the first orbit. Extravehicular activity (EVA) was perfected through increasing practice on Gemini 4, 9A, 10, 11, and 12. On Gemini 12, Edwin "Buzz" Aldrin spent over five hours working comfortably during three (EVA) sessions, finally proving that humans could perform productive tasks outside their spacecraft. Gemini 10, 11, and 12 used the ATV's engine to make large changes in its orbit while docked. Gemini 11 used the Agena's rocket to achieve a crewed Earth orbit record apogee of 742 nautical miles (1,374 km). Gemini 8 experienced the first in-space mission abort on March 17, 1966, just after achieving the world's first docking, when a stuck or shorted thruster sent the craft into an uncontrolled spin. Command pilot Neil Armstrong was able to shut off the stuck thruster and stop the spin by using the re-entry control system. He and his crewmate David Scott landed and were recovered safely. Most of the novice pilots on the early missions would command the later missions.
Silence was their way of maintaining control in these situations, but it often came at the expense of their health and the advancement of female health and medicine. This silence and control were most obviously seen when the health problem was related to the core of Ming fuke, or the sexual body. It was often in these diagnostic settings that women would choose silence. In addition, there would be a conflict between patient and doctor on the probability of her diagnosis. For example, a woman who thought herself to be past the point of child-bearing age, might not believe a doctor who diagnoses her as pregnant. This only resulted in more conflict.
In fact, the aggregation of a protein generates a variety of aggregates, all of which are likely to be toxic to some degree. A wide variety of biochemical, physiological and cytological perturbations has been identified following the exposure of cells and animals to such species, independently of their identity. The oligomers have also been reported to interact with a variety of molecular targets. Hence, it is unlikely that there is a unique mechanism of toxicity or a unique cascade of cellular events. The misfolded nature of protein aggregates causes a multitude of aberrant interactions with a multitude of cellular components, including membranes, protein receptors, soluble proteins, RNAs, small metabolites, etc.
==== Fibres ==== Fibres found in the extracellular matrix are collagen fibers, elastic fibers, and reticular fibers. Collagen fibres are fixated in intercellular spaces via ground substance, a clear, colorless, and viscous fluid containing glycosaminoglycans and proteoglycans.
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==== Canada ==== In Canada, MDMA is listed as a Schedule 1 as it is an analogue of amphetamine. The Controlled Drugs and Substances Act was updated as a result of the Safe Streets and Communities Act changing amphetamines from Schedule III to Schedule I in March 2012. In 2022, the federal government granted British Columbia a 3-year exemption, legalizing the possession of up to 2.5 grams (0.088 oz) of MDMA in the province from February 2023 until February 2026.
Proteinogenic amino acids Cysteine (Cys, C) Methionine (Met or M), an essential amino acid in humans Metabolic products: Cystine, a cysteine dimer, and an oxidation product of cysteine Homocysteine (Hcy) Homocystine, a homocysteine dimer, and an oxidation product of homocysteine Cystathionine, produced by the transsulfuration pathway S-Adenosyl methionine (SAM, SAMe, SAM-e, AdoMet), a common cofactor in methyltransferases S-Adenosyl homocysteine (SAH), a side product of biomethylation by methyltransferases
, where e is the engineering normal strain, L is the original length of the fiber and l is the final length of the fiber. The true shear strain is defined as the change in the angle (in radians) between two material line elements initially perpendicular to each other in the undeformed or initial configuration. The engineering shear strain is defined as the tangent of that angle, and is equal to the length of deformation at its maximum divided by the perpendicular length in the plane of force application, which sometimes makes it easier to calculate.
Reptilian skin is covered in a horny cornified epidermis, making it watertight and enabling reptiles to live on dry land, in contrast to amphibians. Compared to mammalian skin, that of reptiles is rather thin and lacks the thick dermal layer that produces leather in mammals. The scaly skin typical of reptiles was likely inherited from the mutual common ancestor of amniotes, as early synapsids (as well as close relatives of amniotes like diadectomorphs) also had scaly reptile-like skin. This epidermis has differentiated alpha- and beta-keratin layers. Reptile skin varies from being highly pliable (snakes, geckoes) to inflexible (crocodilians, many turtles, many lepidosaurs) and the scales from highly overlapping (skinks and snakes) to having very little overlap (crocodilians, geckoes and agamids). Some areas of the body may not covered in scales (such as large areas of the body in turtles), but still generally have a rough appearance. Large plate-like scales, such as those covering the shells of turtles and the bodies of crocodilians, are referred to as scutes. The tips of reptile digits are generally capped with hard, curved cornified claws.
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=== Return to Essendon Football Club (2010–2014) === On 10 November 2010, Thompson signed a lucrative contract to return to Essendon as the senior assistant coach under senior coach James Hird, putting an end to weeks of speculation following his resignation from Geelong. According to football writer and commentator Caroline Wilson's sources, his contract was said to be worth $650,000 per year. He was appointed the senior coach for the 2014 season while James Hird served his suspension, and left the club after Hird returned as senior coach at the end of that year.
== Discovery == In the late 1960s, non-selective serotonin receptor antagonists demonstrated a relationship between serotonin receptors and food intake. Later, animal studies showed that serotonin receptor agonists might act as a mediator of satiety. Serotonin has been implicated as a critical factor in the short-term regulation of food intake and in promoting loss of weight associated with hyperphagia. Studies using pharmacological and genetic tools demonstrated that the 5-HT2C receptor subtype was one of the principal mediators through which serotonin exerts its anorectic effects in rodents. Subsequently, these receptors became a promising pharmacotherapeutic target for further investigation for the treatment of obesity. The development of 5-HT2C receptor knockout mice in the mid-1990s was a hallmark achievement in the identification and development of serotonergic drugs for weight loss. These knockout mice were hyperphagic, which led to obesity, partial Leptin resistance, increased adipose deposition, insulin resistance, and impaired glucose tolerance. As a result of these symptoms, the researchers identified a functional role for the receptors in serotonergic regulation of food intake and body weight. Later, 5-HT2C receptors were proposed as a therapeutic target for the treatment of multiple central nervous system (CNS) disorders including: psychiatric disorders, obesity, sexual dysfunction and urinary incontinence.
The Cephalopoda descended from a mollusc resembling the Monoplacophora in the Cambrian some 530 million years ago. The Coleoidea, which brought their shells inside the body, diverged from the nautiloids in the Devonian some 416 million years ago. Around 276 million years ago, during the Permian, the coleoids split into two groups, the Vampyropoda and the Decabrachia. The octopuses arose from the Muensterelloidea within the Vampyropoda in the Jurassic. The earliest octopus likely lived near the sea floor (benthic to demersal) in shallow marine environments. Octopuses consist mostly of soft tissue, and so fossils are relatively rare. As soft-bodied cephalopods, they lack the external shell of most molluscs, including other cephalopods like the nautiloids and the (extinct) Ammonoidea. They have eight limbs like other Coleoidea, but lack the extra specialised feeding appendages known as tentacles which are longer and thinner with suckers only at their club-like ends. The vampire squid (Vampyroteuthis) also lacks tentacles but has sensory filaments. The cladograms are based on Sanchez et al., 2018, who created a molecular phylogeny based on mitochondrial and nuclear DNA marker sequences. The position of the Eledonidae is from Ibáñez et al., 2020, with a similar methodology. Divergence dates are from Kröger et al., 2011 and Fuchs et al., 2019.
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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.
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.