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.
Last reviewed on 2026-03-11. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Laboratory-grade epitalon is typically supplied as a lyophilized powder. Purity is commonly assessed with reverse-phase high-performance liquid chromatography, often paired with mass spectrometry to confirm molecular identity. Amino acid analysis and peptide mapping can provide additional confirmation of sequence. Certificates of analysis for research materials frequently report purity above 95 percent, although the methods behind such figures vary between suppliers. The absence of a pharmacopeial monograph means that no single standardized assay defines the compound, so reported results depend on the analytical protocol chosen.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Free acid form of the tetrapeptide |
| Molecular mass | About 390.35 Da | Calculated monoisotopic value |
| Appearance | White to off-white powder | Typical lyophilized presentation |
| Solubility | Soluble in water | Also dissolves in buffered saline |
| Storage temperature | Minus 20 degrees Celsius | Dry, dark conditions; avoid repeated thawing |
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.
== National Mass Spectrometry Service == A grant of £670,000 was awarded in 1985 by the then Science and Engineering Research Council (SERC) to establish a national Mass Spectrometry Center at Swansea University to provide an analytical service to British Universities. It was officially opened in April 1987 by Lord Callaghan. In 2002, the center was enlarged and the new laboratories were opened by Lord Morgan. Following successful £3,000,000 contract renewal Edwina Hart, the Minister for Economy, Science and Transport, officially re-opened the EPSRC National Research Facility after refurbishment in 2015.
The club is recorded as having played at McCracken's Paddock, Glass's Paddock, and Flemington Hill. It is likely that these are three different names for the one ground, given that McCracken's Paddock was a parcel of land that sat within the larger Glass's Paddock, which in turn was situated in an area widely known at the time as Flemington Hill. In 1882, the club moved home games to the East Melbourne Cricket Ground (since demolished) after an application to play on the Essendon Cricket Ground (later known as Windy Hill) was voted down by Lord Mayor of the City of Essendon, James Taylor, on the basis that the considered the Essendon Cricket Ground "to be suitable only for the gentleman's game of cricket". The club became known by the nickname "the Same Old Essendon" from the title and hook of the principal song performed by a band of supporters which regularly occupied a section of the grandstand at the club's games. The nickname first appeared in print in the local North Melbourne Advertiser in 1889, and ended up gaining wide use, often as the diminutive "Same Olds". This move away from Essendon, at a time when fans would walk to their local ground, didn't go down too well with many Essendon people; and, as a consequence, a new team and club was formed in 1900, unconnected with the first (although it played in the same colours), that was based at the Essendon Cricket Ground, and playing in the Victorian Football Association. It was known firstly as Essendon Town and, after 1905, as Essendon (although it was often called Essendon A, with the A standing for association).
In the 1980s, while the number of arrests for all crimes had risen by 28%, the number of arrests for drug offenses rose 126%. In 1994, the New England Journal of Medicine reported that the war on drugs resulted in the incarceration of one million Americans each year. In 2008, The Washington Post reported that of 1.5 million Americans arrested each year for drug offenses, half a million would be incarcerated, and one in five black Americans would spend time behind bars due to drug laws. In 2019, the FBI estimated about 1.5 million drug arrests nationally, 32.1% for cannabis and 31% for "other dangerous nonnarcotic drugs". Federal and state policies also impose collateral consequences on those convicted of drug offenses, separate from fines and prison time, that are not applicable to other types of crime. To comply with a federal law known as the Solomon–Lautenberg amendment, a number of states require a six-months driver's license suspension for anyone convicted of a drug offense. Other examples of collateral consequences for drug offenses, or for felony offenses in general, include loss of professional license, loss of ability to legally purchase a firearm under Federal law, loss of eligibility for food stamps, loss of eligibility for Federal Student Aid, loss of eligibility to live in public housing, loss of ability to vote, and deportation, a total of over 460 benefits at risk at the federal level alone. The US provides for the deportation of non-citizens convicted of drug offenses.
Sources: en.wikipedia.org
==== Shoulder replacement ==== For people who have shoulder osteoarthritis and do not respond to medications, surgical options include a shoulder hemiarthroplasty (replacing a part of the joint) and a total shoulder arthroplasty (replacing the joint). Demand for this treatment is expected to increase by 750% by the year 2030. There are different options for shoulder replacement surgeries, however there is a lack of evidence in the form of high-quality randomized controlled trials to determine which type of shoulder replacement surgery is most effective in different situations, what are the risks involved with different approaches, or how the procedure compares to other treatment options. There is some low-quality evidence that indicates that when comparing total shoulder arthroplasty over hemiarthroplasty, no large clinical benefit was detected in the short term. It is not clear if the risk of harm differs between total shoulder arthroplasty and a hemiarthroplasty approach.
Another function of this coenzyme in cell signaling is as a precursor of cyclic ADP-ribose, which is produced from NAD+ by ADP-ribosyl cyclases, as part of a second messenger system. This molecule acts in calcium signaling by releasing calcium from intracellular stores. It does this by binding to and opening a class of calcium channels called ryanodine receptors, which are located in the membranes of organelles, such as the endoplasmic reticulum, and inducing the activation of the transcription factor NAFC3 NAD+ is also consumed by different NAD+-consuming enzymes, such as CD38, CD157, PARPs and the NAD-dependent deacetylases (sirtuins, such as Sir2.). These enzymes act by transferring an acetyl group from their substrate protein to the ADP-ribose moiety of NAD+; this cleaves the coenzyme and releases nicotinamide and O-acetyl-ADP-ribose. The sirtuins mainly seem to be involved in regulating transcription through deacetylating histones and altering nucleosome structure. However, non-histone proteins can be deacetylated by sirtuins as well. These activities of sirtuins are particularly interesting because of their importance in the regulation of aging. Other NAD-dependent enzymes include bacterial DNA ligases, which join two DNA ends by using NAD+ as a substrate to donate an adenosine monophosphate (AMP) moiety to the 5' phosphate of one DNA end. This intermediate is then attacked by the 3' hydroxyl group of the other DNA end, forming a new phosphodiester bond. This contrasts with eukaryotic DNA ligases, which use ATP to form the DNA-AMP intermediate. Li et al.
Helton enjoyed arguably his best season in 2000, leading the major leagues in batting average (.372), RBI (147), doubles (59), total bases (405), extra base hits (103), slugging percentage (.698) and OPS (1.162). He led the NL in hits (216) and on-base percentage (.463). Helton hit a league-leading home batting average of .391 and was third in the NL in road batting average (.353). Helton's MLB-leading 103 extra base hits tied for the fourth most in MLB history and the second most in NL history. His league-leading numbers in on-base percentage, slugging percentage and batting average gave him the "percentage triple crown." Helton became the second Rockies player, after Larry Walker in 1999, to accomplish that feat. Helton and Walker made the Rockies the first team in MLB history to record percentage triple crowns in consecutive seasons with different players. Helton became only the fourth player in NL history to lead the league in both batting average and RBI. He became the first player in NL history and the fifth player in MLB history (Babe Ruth, Lou Gehrig, Jimmie Foxx and Hank Greenberg are the others) to have at least 200 hits, 40 home runs, 100 RBI, 100 runs, 100 extra base hits, and 100 walks in one season. Helton was invited to his first career MLB All-Star Game in 2000. He also received NL Player of the Month honors for May and August. He finished fifth in voting for the MVP award. However, the Associated Press, Sporting News, USA Baseball Alumni, and Baseball Digest all named Helton the MLB Player of the Year.
Sources: en.wikipedia.org
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.
No naturally occurring free form of the peptide has been described. The four-amino-acid sequence can appear as a fragment within larger proteins, but that is not the same as the intact compound being present as a circulating molecule. Materials used in research are synthetic.
Purity is usually checked by reverse-phase high-performance liquid chromatography, which separates the target peptide from related impurities. Mass spectrometry is commonly used alongside it to confirm molecular mass. Some suppliers also provide amino acid analysis for additional sequence confirmation.
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.