If you have been reading about pineal peptides 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.
Updated 2025-11-09. Numbers and descriptions here follow the published literature rather than marketing material.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
The four residues give epitalon a molecular formula of C14H22N4O9 and a molecular weight near 390.35 daltons. The presence of two acidic residues, glutamate and aspartate, makes the free peptide strongly acidic, while the alanine and glycine ends provide neutral, nonpolar character. This combination produces a molecule with substantial water solubility. Because there are no cysteine, methionine, or tryptophan residues, the peptide lacks the most common oxidation-sensitive side chains, which simplifies handling compared with many longer peptides.
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.
| Property | Value | Notes |
|---|---|---|
| Amino acid sequence | Ala-Glu-Asp-Gly | Tetrapeptide, often abbreviated AEDG |
| Molecular formula | C14H22N4O9 | Free peptide, unmodified termini |
| Molecular weight | ~390.35 Da | Calculated for the free acid form |
| Appearance | White to off-white powder | Typical lyophilized product form |
| Solubility class | Freely soluble in water | Two acidic residues dominate ionic character |
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
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.
==== Emulsions ==== The so-called "oil" adjuvants are really oils intended to be made into an emulsion with water, either oil-in-water (O/W) or water-in-oil (W/O). They would not work when moved out of the droplet form. Freund's complete adjuvant is a solution of inactivated Mycobacterium tuberculosis in mineral oil and/or lanolin developed in 1930. It is used as water-in-oil, It is not safe enough for human use. A safer version without the bacteria is known as Freund's incomplete adjuvant, but its effect is weaker. In either case, the W/O structure probably helps vaccines release antigens for a longer time. Despite the side effects, its potential benefit has led to a few clinical trials, including a few attempts at adding other microbial-derived parts to balance safety and strength. (A common side effect for both versions is long-term retention of the oil in tissue.) All "oil" adjuvants approved for humans are oil-in-water. They adsorb antigens to their surface and induce immune cell recruitment. All of these human-approved O/W adjuvants use squalene, an oil produced by human liver and skin. MF59 is an oil-in-water emulsion of squalene adjuvant used in some human vaccines. As of 2021, over 22 million doses of one vaccine with squalene, FLUAD, have been administered with no severe adverse effects reported. In addition, squalene-based O/W emulsions have also been shown to stably incorporate small molecule TLR7/8 adjuvants (e.g. PVP-037) and lead to enhanced adjuvanticity via synergism. An interesting choice of oil in O/W emusions is vitamin E.
Diabetic ketoacidosis (DKA) is a potentially life-threatening acute complication of diabetes mellitus. Signs and symptoms may include vomiting, abdominal pain, deep gasping breathing, increased urination, weakness, confusion and occasionally loss of consciousness. A person's breath may develop a specific "fruity" or acetone smell. The onset of symptoms is usually rapid. People without a previous diagnosis of diabetes may develop DKA as the first obvious symptom. DKA happens most often in those with type 1 diabetes but can also occur in those with other types of diabetes under certain circumstances. Triggers may include infection, not taking insulin correctly, stroke and certain medications such as steroids. DKA results from a shortage of insulin; in response, the body switches to burning fatty acids, which produces acidic ketone bodies. DKA is typically diagnosed when testing finds high blood sugar, low blood pH and keto acids in either the blood or urine. The primary treatment of DKA is with intravenous fluids and insulin. Depending on the severity, insulin may be given intravenously or by injection under the skin. Usually, potassium is also needed to prevent the development of low blood potassium. Throughout treatment, blood glucose and potassium levels should be regularly checked. Underlying causes for the DKA should be identified. In those with severely low blood pH who are critically ill, sodium bicarbonate may be given; however, its use is of unclear benefit and typically not recommended. Rates of DKA vary around the world.
The body of a teleost is denser than water, so fish must compensate for the difference, or they will sink. A defining feature of Actinopteri (Chondrostei, Holostei and teleosts) is the swim bladder. Originally present in the last common ancestor of the teleosts, it has since been lost independently at least 30–32 times in at least 79 of 425 families of teleosts where the swim bladder is absent in one or more species. This absence is often the case in fast-swimming fishes such as the tuna and mackerel. The swim bladder helps fish adjusting their buoyancy through manipulation of gases, which allows them to stay at the current water depth, or ascend or descend without having to waste energy in swimming. In the more primitive groups like some minnows, the swim bladder is open (physostomous) to the esophagus. In fish where the swim bladder is closed (physoclistous), the gas content is controlled through the rete mirabilis, a network of blood vessels serving as a countercurrent gas exchanger between the swim bladder and the blood.
Sources: en.wikipedia.org
Marxism–Leninism–Maoism became the name for the ideology of the Chinese Communist Party and of other Communist parties, which broke off from national Communist parties, after the Sino–Soviet split, especially when the split was finalised by 1963. The Italian Communist Party was mainly influenced by Antonio Gramsci, who gave a more democratic implication than Lenin's for why workers remained passive. A key difference between Maoism and other forms of Marxism–Leninism is that peasants should be the bulwark of the revolutionary energy, which is led by the working class. Three common Maoist values are revolutionary populism, pragmatism, and dialectics. According to Rachel Walker, "Marxism–Leninism" is an empty term that depends on the approach and basis of ruling Communist parties, and is dynamic and open to redefinition, being both fixed and not fixed in meaning. As a term, "Marxism–Leninism" is misleading because Marx and Lenin never sanctioned or supported the creation of an -ism after them, and is revelling because, being popularized after Lenin's death by Stalin, it contained three clear doctrinal and institutionalized principles that became a model for later Soviet-type regimes; its global influence, having at its height covered at least one-third of the world's population, has made Marxist–Leninist a convenient label for the Communist bloc as a dynamic ideological order.
There are various preparations of gonadotropins for therapeutic use, mainly as fertility medication. For example, the so-called menotropins (also called human menopausal gonadotropins) consist of LH and FSH extracted from the urine of menopausal women. There are also recombinant variants. Besides the aforementioned legitimate pharmaceutical drugs, there are fad diet or quack preparations, which are illegal in various countries.
=== Adalimumab === Adalimumab was approved by the FDA in 2002, becoming the first fully human monoclonal antibody to be approved. It was initially used in the treatment of rheumatoid arthritis, but it is now also used in patients with moderate-to-severe Crohn's disease and ulcerative colitis who don't respond well to conventional treatment. Adalimumab showed effectiveness in patients with Crohn's disease, but less than that of infliximab. It was the best selling drug in 2017 with sales upwards of $18 billion.
Sources: en.wikipedia.org
Truveta, Inc. is an American health data and analytics company headquartered in Bellevue, Washington and owned and governed by 30 U.S. health systems. Truveta was established in 2020 by Providence, Advocate Health, Tenet Healthcare, and Trinity Health. The company was publicly introduced in February 2021 with fourteen founding health system members. As of 2025, Truveta includes 30 U.S. health systems as members. Truveta provides de-identified electronic health record data for more than 120 million U.S. patients.
=== Gas chromatography – gas chromatography === Comprehensive two-dimensional gas chromatography is an analytical technique that separates and analyzes complex mixtures. It has been utilized in fields such as: flavor, fragrance, environmental studies, pharmaceuticals, petroleum products and forensic science. GCxGC provides a high range of sensitivity and produces a greater separation power due to the increased peak capacity.
== Active site == The spherical carboxypeptidase domain of the catalytic subunit has a circular indentation in the surface which is the location of the active-site groove. The base of the groove is formed by 3 β-sheets while the walls of the groove are lined with α-helices. The electron density in the middle of the groove allows a space for the zinc ion cofactor to bind. The P1' residue of the substrate is placed in a specific cavity (S1') of the active-site groove while the P1 residues and on extend into a mostly hydrophobic area of the groove (in pockets S1, S2, etc.). The scissile peptide bond is held in place with several polar interactions between protein side groups. The nitrogen atom on the C-terminal side is anchored to the nearby guanidine groups of arginine molecules. On the N-terminal side, the nitrogen atom is held by hydrogen bonds with tyrosine while the carbonyl group is held by hydrogen bonds with lysine. These interactions stretch the peptide bond and set it up for the water molecule to break it apart. While there are technically two active sites on the tetramer, one on each active subunit, only one active site can be used at a time.
Sources: en.wikipedia.org
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.
No. Epitalon is chemically synthesized, not extracted. It was designed as a short synthetic fragment conceptually related to larger pineal peptides studied in the same research tradition, particularly the extract known as epithalamin. The two are distinct materials with different compositions.
The term bioregulator is used in this research tradition for short peptides proposed to influence gene expression or cell function. Epitalon is grouped with other synthetic short peptides under this label. The term reflects a proposed mechanism rather than an established drug classification.
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.