If you have been reading about epitalon 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 2025-11-17. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Reported biological findings come mainly from cell culture and rodent experiments. Those studies describe changes in telomerase catalytic subunit expression, melatonin rhythm amplitude, and antioxidant enzyme activity after peptide exposure. Human data are sparse and consist of small trials with limited blinding and inconsistent endpoints. The proposed mechanisms remain hypotheses rather than established facts, and there is no consensus on whether effects observed in animals carry over to people. Independent replication outside the original research groups is limited, which is a recognised gap in the published literature.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four-residue sequence |
| Molar mass | About 390.35 g/mol | Free peptide, counter-ion not included |
| Appearance | White to off-white powder | Lyophilised solid from aqueous solution |
| Water solubility | Freely soluble | Short, polar peptide chain |
| Common synonyms | AEDG; epithalone | Catalogues use the names interchangeably |
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.
In striated skeletal muscle cells, GLUT4 concentration in the plasma membrane can increase as a result of either exercise or muscle contraction. During exercise, the body needs to convert glucose to ATP to be used as energy. As G-6-P concentrations decrease, hexokinase becomes less inhibited, and the glycolytic and oxidative pathways that make ATP are able to proceed. This also means that muscle cells are able to take in more glucose as its intracellular concentrations decrease. In order to increase glucose levels in the cell, GLUT4 is the primary transporter used in this facilitated diffusion. Although muscle contractions function in a similar way and also induce the translocation of GLUT4 into the plasma membrane, the two skeletal muscle processes obtain different forms of intracellular GLUT4. The GLUT4 carrier vesicles are either transferrin positive or negative, and are recruited by different stimuli. Transferrin-positive GLUT4 vesicles are utilized during muscle contraction while the transferrin-negative vesicles are activated by insulin stimulation as well as by exercise.
The Arabia hit a tree snag and sank in the Missouri River on September 5, 1856. All 130 passengers survived, but an estimated 220 tons of cargo went down with it. Shortly thereafter, the river changed course, and the Arabia was buried underground. The cargo, destined for 16 towns on the frontier, was buried under a cornfield in Wyandotte County, Kansas, for 132 years until it was discovered in 1988 by River Salvage Inc., a group of self-proclaimed treasure hunters who began excavations. David, Greg, and Bob Hawley owned a refrigeration repair business. They partnered with Jerry Mackey, owner of Hi-Boy restaurants in Independence, Missouri, and David Lutrell from the construction industry, along with other family and friends, to form River Salvage Inc. With the permission of the land owner, they dug between November 1988 and February 1989. Although their original goal was to sell their discoveries, the historical importance of the finding quickly became apparent, and they started to plan a museum. Today, it is still owned and operated by the Hawley family, who are present there most days, often greeting visitors and answering questions.
In 2007, US Fleet Tracking provided live GPS tracking to Gameday Management Group for use at the Super Bowl, tracking AFC and NFC Team buses, media buses, press buses, halftime entertainers, team owners and team family limousines, and other critical assets. US Fleet Tracking continues to provide these services for the Super Bowl each year, as it has each year since 2007 (through 2020). In 2013, US Fleet Tracking sponsored the FLS Microjet for its appearance at the EAA AirVenture Oshkosh airshow in Oshkosh, Wisconsin. The company demonstrated its live tracking technology at the event by installing its proprietary GPS equipment on the FLS Microjet and allowing the public to follow the course of the aircraft via a website in real time during the exhibition.
Sources: en.wikipedia.org
DiCostanza relates the story that a customer came into the family deli and through an exchange matching the customer's requests and the deli's offerings, the hoagie was created. Additional spellings include "hoagy". Today, the hoagie is a common menu item in Philadelphia delis. Eateries such as Campo's, Geno's Steaks, and Pat's King of Steaks all offer hoagies on their menu. Woolworth's to-go sandwich was called a hoagie in all of its U.S. stores. Bánh mì sandwiches are sometimes referred to as "Vietnamese hoagies" in Philadelphia.
Despite the creation of an affordable housing agenda that was rooted in liberal thought, Roosevelt's New Deal underhandedly restricted the residential agency of black Detroiters since it was predicated upon a de jure system of residential segregation. The New Deal policy policy remained tethered to the governmental imposition of societal and policy discrimination that aggravated structures of racism within Detroit's fractured housing market. In the unfolding of the housing crisis within Detroit, the federal government perpetuated the marginalization of black Detroiters by neglecting the jarring racism and segregation that New Deal policy produced. The theories of eugenics and racial inferiority that dictated FHA policymaking certainly translated into the FHA's subsidization of black homeownership upon the cessation of redlining. During an era of racial liberalism, the FHA's colorblindness and no redlining policy failed to reverse the cumulative effects of structural racism. In response to the prolonged refusal of mortgages for African Americans, the FHA passed the 1968 Housing and Urban Development Act (HUD) to encourage low-income homeownership through low-interest mortgage loans with the full financial backing of the federal government.
=== Schizophrenia === Both liquid chromatography and liquid chromatography/mass spectrometric assays have found that brain tissue of deceased people with schizophrenia shows altered arginine metabolism. Assays also confirmed significantly reduced levels of γ-aminobutyric acid (GABA), but increased agmatine concentration and glutamate/GABA ratio in the schizophrenia cases. Regression analysis indicated positive correlations between arginase activity and the age of disease onset and between L-ornithine level and the duration of illness. Moreover, cluster analyses revealed that L-arginine and its main metabolites L-citrulline, L-ornithine and agmatine formed distinct groups, which were altered in the schizophrenia group. Despite this, the biological basis of schizophrenia is still poorly understood, a number of factors, such as dopamine hyperfunction, glutamatergic hypofunction, GABAergic deficits, cholinergic system dysfunction, stress vulnerability and neurodevelopmental disruption, have been linked to the aetiology and/or pathophysiology of the disease.
Sources: en.wikipedia.org
=== Prehistoric reptiles === Pterosaurian pycnofibrils strongly resemble mammalian hair, but are thought to have evolved independently. Ornithischian (bird-hipped) dinosaurs had a pelvis shape similar to that of birds, or avian dinosaurs, which evolved from saurischian (lizard-hipped) dinosaurs. The Heterodontosauridae evolved a tibiotarsus which is also found in modern birds. These groups are not closely related. Ankylosaurs and glyptodont mammals both had spiked tails. The sauropods and giraffes independently evolved long necks. The horned snouts of ceratopsian dinosaurs like Triceratops have also evolved several times in Cenozoic mammals: rhinos, brontotheres, Arsinoitherium, and Uintatherium. Rhynchosaur teeth resemble that of the extant rodents. Billed snouts on the duck-billed dinosaurs hadrosaurs are strikingly convergent with ducks and the duck-billed platypus. Ichthyosaurs (such as Ophthalmosaurus) are marine reptile of the Mesozoic era which looked strikingly like dolphins. Several groups of marine reptiles evolved hyperphalangy similar to modern whales. Toothless beaks are independently derived in ornithomimosaurian, alvarezsaurian, therizinosaurian, oviraptorosaurian and ceratopsian dinosaurs like Triceratops, certain pterosaurs, birds, turtles, and cephalopods like squid, cuttlefish, and octopus. The "Pelycosauria" and the Ctenosauriscidae bore striking resemblance to each other because they both had a sail-like fin on their back.
The Library of Congress (LOC) is a research library in Washington, D.C., serving as the library and research service for the United States Congress and the de facto national library of the United States. It also administers copyright law through the United States Copyright Office, and it houses the Congressional Research Service. Founded in 1800, the Library of Congress is the oldest federal cultural institution in the United States. It is housed in three buildings on Capitol Hill, adjacent to the United States Capitol, along with the National Audio-Visual Conservation Center in Culpeper, Virginia, and additional storage facilities at Fort George G. Meade and Cabin Branch in Hyattsville, Maryland. The library's functions are overseen by the librarian of Congress, and its buildings are maintained by the architect of the Capitol. The library is one of the largest libraries in the world, containing approximately 173 million items and employing over 3,000 staff. Its collections are "universal, not limited by subject, format, or national boundary, and include research materials from all parts of the world and in more than 470 languages". When Congress moved to Washington in November 1800, a small congressional library was housed in the Capitol. Much of the original collection was lost during the 1814 burning of Washington by British forces during the War of 1812. Congress accepted former president Thomas Jefferson's offer to sell his entire personal collection of 6,487 books to restore the library.
When taken in normal therapeutic doses, paracetamol has been shown to be safe. Following a therapeutic dose, it is mostly converted to nontoxic metabolites via Phase II metabolism by conjugation with sulfate and glucuronide, with a small portion being oxidized via the cytochrome P450 enzyme system. Cytochromes P450 2E1 and 3A4 convert approximately 5% of paracetamol to a highly reactive intermediary metabolite, N-acetyl-p-benzoquinone imine (NAPQI). Under normal conditions, NAPQI is detoxified by conjugation with glutathione to form cysteine and mercapturic acid conjugates. In cases of paracetamol overdose, the sulfate and glucuronide pathways become saturated, and more paracetamol is shunted to the cytochrome P450 system to produce NAPQI. As a result, hepatocellular supplies of glutathione become depleted, as the demand for glutathione is higher than its regeneration. NAPQI therefore remains in its toxic form in the liver and reacts with cellular membrane molecules, resulting in widespread hepatocyte damage and death, leading to acute liver necrosis. In animal studies, the liver's stores of glutathione must be depleted to less than 70% of normal levels before liver toxicity occurs.
==== Cytotoxic antibiotics ==== The cytotoxic antibiotics are a varied group of drugs that have various mechanisms of action. The common theme that they share in their chemotherapy indication is that they interrupt cell division. The most important subgroup is the anthracyclines and the bleomycins; other prominent examples include mitomycin C and actinomycin. Among the anthracyclines, doxorubicin and daunorubicin were the first, and were obtained from the bacterium Streptomyces peucetius. Derivatives of these compounds include epirubicin and idarubicin. Other clinically used drugs in the anthracycline group are pirarubicin, aclarubicin, and mitoxantrone. The mechanisms of anthracyclines include DNA intercalation (molecules insert between the two strands of DNA), generation of highly reactive free radicals that damage intercellular molecules and topoisomerase inhibition. Actinomycin is a complex molecule that intercalates DNA and prevents RNA synthesis. Bleomycin, a glycopeptide isolated from Streptomyces verticillus, also intercalates DNA, but produces free radicals that damage DNA. This occurs when bleomycin binds to a metal ion, becomes chemically reduced and reacts with oxygen. Mitomycin is a cytotoxic antibiotic with the ability to alkylate DNA.
Sources: en.wikipedia.org
It is a synthetic tetrapeptide built from alanine, glutamate, aspartate and glycine. The four residues are joined by standard peptide bonds, giving a linear chain rather than a branched structure.
The name derives from epithalamin, a pineal gland extract studied in the former Soviet Union. Researchers proposed that short fragments of that extract carried the biological activity of interest.
No major regulatory agency has approved it as a medicine. It is handled as a research chemical, and products sold under this name are not standardised drugs with defined clinical labelling.
It is based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.