Everything below concerns Mass spectrometry. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-07. Numbers and descriptions here follow the published literature rather than marketing material.
The most frequently cited laboratory finding is that AEDG increased telomerase activity and extended telomere length in cultured human somatic cells. That work used fetal fibroblast strains and reported changes in enzyme activity alongside altered division counts. Replication by unrelated groups has been limited, and the published record is largely a single-laboratory series rather than a multi-centre programme. The result supports a hypothesis about peptide influence on gene expression in cell culture; it does not by itself establish an effect on telomere length in living animals or in people.
Animal and clinical reports appear mainly in Russian-language journals from the 1990s and 2000s, covering endpoints such as melatonin rhythm, lifespan in aged rodents, and retinal function. Many of these papers involve small groups, lack blinding or placebo comparison, and are difficult to retrieve through indexed databases. Review articles published in English generally summarise the claims without reanalysing the underlying data. Because no large randomised trial exists, the clinical importance of these reported effects stays unresolved and is properly described as an open question.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not an approved drug | Marketed in most countries as a research chemical |
| Main literature language | Russian and English | Early reports concentrated in Russian journals |
| Typical stated purity | ≥95% by HPLC | Supplier declaration, seldom independently verified |
| Principal studied endpoint | Telomerase activity in vitro | Measured in cultured human cells |
| Reported administration routes | Subcutaneous, intranasal | Described in exploratory use reports |
Regulatory status varies by country and is not harmonized. Epitalon is not an approved drug in major Western jurisdictions. In some countries it is sold as a research chemical, and in others it has appeared in products marketed for other categories. This inconsistent status means that purity, labeling accuracy, and documentation differ widely between suppliers, and verification of identity and purity through independent analysis is the usual way buyers assess a given lot.
Epitalon appears in the literature primarily through a small number of research groups, most of them associated with the St. Petersburg Institute of Bioregulation and Gerontology. Publications describe cell culture experiments, animal studies, and a limited number of small human studies. Independent replication outside this network is sparse. As a result, reviews of the topic usually separate descriptive reports of observed effects from the question of whether those effects generalize, and they note the difficulty of comparing studies that use different preparations and endpoints.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
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.
Stability of the tetrapeptide follows ordinary peptide chemistry rather than any unusual structural feature. The aspartate-glycine pair is prone to aspartimide formation under mildly basic or neutral conditions, and deamidation can follow, altering both mass and chromatographic retention. Dry lyophilised powder kept at or below minus twenty degrees Celsius is the usual handling recommendation, with repeated freeze-thaw cycles avoided. Once dissolved in neutral aqueous buffer, degradation proceeds over days to weeks depending on pH and temperature, while acidic conditions generally slow the aspartimide route. A formal stability-indicating study has not been published in the indexed literature.
Because epitalon has no pharmacopoeial monograph, quality assessment depends on supplier documentation and independent testing. Certificates of analysis typically report a purity figure from a single chromatographic run, a measured mass and sometimes an appearance description, but methods and acceptance criteria are not harmonised across vendors. Third-party laboratories can repeat identity and purity measurements, and mismatches between labelled and measured peptide content have been described for research peptides generally. What constitutes adequate identity confirmation for a molecule of this size stays an open question, since mass agreement alone does not separate closely related sequences.
Identity testing for epitalon relies on reversed-phase high-performance liquid chromatography for purity and mass spectrometry for mass confirmation. Because the sequence contains no tryptophan or tyrosine, ultraviolet detection at 280 nanometres is insensitive, so chromatographic methods usually monitor absorbance near 214 nanometres, where the peptide backbone absorbs. Electrospray ionisation or matrix-assisted laser desorption/ionisation then checks the intact mass against the expected value near 390 daltons. Peptide mapping or amino acid analysis after acid hydrolysis can supplement these measurements, although such confirmatory work is seldom reported on commercial certificates of analysis.
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.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
Russia claimed to have captured the village of Novomykhailivka, Donetsk Oblast, 20 kilometres from Vuhledar. The upper half of the Kharkiv TV Tower was destroyed by a Russian air strike. British intelligence reported that Russian legislator Dmitry Sablin created a new reserve military drone unit called Bars Kaskad to allow VIPs to serve in Ukraine with a reduced risk of "frontline combat". A crowdfunding effort by 50,000 private Slovak citizens raised €3,071,405 in a week to contribute to the Czech initiative to purchase artillery ammunition for Ukraine.
"Clinical evaluation of De Marco formula as an adjunctive therapy for infected ischemic diabetic foot: a prospective randomized controlled trial". Can J Clin Pharmacol. 16 (2): e381–91. PMID 19966380. DeMarco Peter. "Treatment of Macular Degeneration." United States Patent Application, US 20040180090.
After the final primary election, Clinton became the presumptive Democratic nominee. On July 12, Sanders formally endorsed Clinton. He said he would continue to work with the Democratic National Convention organizers to implement progressive positions. Sanders refused to formally concede before the convention. He spoke at the 2016 Democratic National Convention on July 25, during which he gave Clinton his full support. Some of his supporters attempted to protest Clinton's nomination and booed when Sanders called for party unity. He responded, "Our job is to do two things: to defeat Donald Trump and to elect Hillary Clinton ... It is easy to boo, but it is harder to look your kids in the face if we are living under a Trump presidency." On November 8, in the general election, Sanders received almost 6% of the vote in Vermont, even though he was no longer a candidate. This was the highest share of a statewide presidential vote for a write-in draft campaign in American history. He also received more votes in Vermont than Gary Johnson, the Libertarian candidate, and Jill Stein, the Green candidate, combined. It was possible to vote for Sanders as a write-in candidate in 12 states, and exact totals of write-in votes for him were published in three of them: California, New Hampshire, and Vermont. In those three states, he received 111,850 write-in votes, about 15% of the write-in votes nationwide, and less than 1% of total nationwide vote.
Sources: en.wikipedia.org
=== Articles === W. Meier-Augenstein, W. Brand, G.F. Hoffmann, D. Rating (1994). “Bridging the Information Gap between Isotope Ratio Mass Spectrometry and Conventional Mass Spectrometry”. Biol. Mass Spectrom. 23, 376-378. W. Meier-Augenstein (1995). “On-line Recording of 13C/12C Ratios and Mass Spectra in one Gas Chromatographic Analysis”. J. High Resolut. Chromatogr. 18, 28-32. Meier-Augenstein, W. (2002). "Stable Isotopic Analysis of Fatty Acids by Gas Chromatography - Isotope Ratio Mass Spectrometry". Anal. Chim. Acta. 465 (1–2): 63–79. doi:10.1016/s0003-2670(02)00194-0. W. Meier-Augenstein and R. H. Liu: "Forensic Applications of Isotope Ratio Mass Spectrometry", in Advances in Forensic Application of Mass Spectrometry by Jehuda Yinon [ed.], CRC Press, Boca Raton, Florida (USA), (2003), chapter 4, 149 - 180, ISBN 0-8493-15220. Farmer, N.; Meier-Augenstein, W.; Kalin, R.M. (2005). "Stable Isotope Analysis of Safety Matches using IRMS - A Forensic Case Study". Rapid Commun. Mass Spectrom. 19 (22): 3182–3186. doi:10.1002/rcm.2088. PMID 16220465. W. Meier-Augenstein: "Stable Isotope Fingerprinting", in Forensic Human Identification: An Introduction by S. M. Black & T.J.U. Thomson [eds.], CRC Press, Boca Raton, Florida (USA), (2006), chapter 2, 29-53, ISBN 0-8493-39545. Fraser, I.; Meier-Augenstein, W.; Kalin, R.M. (2006). "The Role of Stable Isotopes in Human Identification: A longitudinal study into the variability of isotope signals in human hair and nails". Rapid Commun. Mass Spectrom. 20 (7): 1109–1116. Bibcode:2006RCMS...20.1109F. doi:10.1002/rcm.2424. PMID 16521167.
They Hunger features little original Half-Life content apart from the revolver, some sound clips, a few types of ammunition the player can pick up, and a few other minor details, although many weapons and NPCs are simply re-skins of the content in Half-Life. For example, the civilians are re-skins of a scientist found in Half-Life. It also includes the flamethrower and sniper rifle from Team Fortress Classic, though it features a different view when scoped. In addition to these modifications, it changes the sounds of certain characters. For example, one friendly NPC features the same sound clips as Barney Calhoun from Half-Life but has been edited to affect a deeper voice. Zombies and headcrabs have also been given voices, which add to the horror aspect of the game. Two deathmatch maps were released separately ahead of the first episode's release. They Hunger 2 and 3 include a multiplayer deathmatch mode. Barking Dog Studios and Gooseman were reported to be involved in the production of They Hunger 2.
== Clinical application == In addition to endomorphins, morphine and morphine-like opiates target the μ-opioid receptor. Thus, endomorphins have significant potential as analgesics and morphine substitutes. In vitro assessment of endomorphins as analgesics reveals similar behavior to morphine and other opiates, where drug tolerance leads to dependence and addiction. Other side effects common to opiates such as vasodilation, respiratory depression, urinary retention, and gastrointestinal reaction develop. However, the endomorphin-induced side effects are slightly less severe than are those of the morphine-derived analgesics commonly used today. Additionally, endomorphins potentially produce more powerful analgesic effects than their morphine-derived counterparts. Despite their potential utility as pharmaceutical agents, the low membrane permeability and vulnerability to enzymatic degradation of endomorphins limit their incorporation into drugs. As a result, endomorphin analogues are being generated to allow transport across the blood brain barrier, increase stability, and reduce side effects. Two endomorphin modifications that approach these problems include glycosylation and lipidation. Glycosylation adds carbohydrate groups to the endomorphin molecules, allowing them to pass membranes via glucose transporters. Lipidation adds lipoamino acids or fatty acids to the endomorphin molecules, increasing hydrophobicity and, therefore, membrane permeability of the molecules.
Bariatric surgery ("weight loss surgery") is the use of surgical intervention in the treatment of obesity. As every operation may have complications, surgery is only recommended for severely obese people (BMI > 40) who have failed to lose weight following dietary modification and pharmacological treatment. Weight loss surgery relies on various principles: the two most common approaches are reducing the volume of the stomach (e.g. by adjustable gastric banding and vertical banded gastroplasty), which produces an earlier sense of satiation, and reducing the length of bowel that comes into contact with food (e.g. by gastric bypass surgery or endoscopic duodenal-jejunal bypass surgery), which directly reduces absorption. Band surgery is reversible, while bowel shortening operations are not. Some procedures can be performed laparoscopically. Complications from weight loss surgery are frequent. Surgery for severe obesity is associated with long-term weight loss and decreased overall mortality. One study found a weight loss of between 14% and 25% (depending on the type of procedure performed) at 10 years, and a 29% reduction in all cause mortality when compared to standard weight loss measures. A marked decrease in the risk of diabetes mellitus, cardiovascular disease and cancer has also been found after bariatric surgery. Marked weight loss occurs during the first few months after surgery, and the loss is sustained in the long term.
Sources: en.wikipedia.org
== Leisure time and unpaid work == In 2010, women in France spent an average of 3 hours and 46 minutes per day on leisure activities, compared to 4 hours and 24 minutes for men. This difference is primarily attributed to disparities in time spent on activities such as gaming, internet use, and sports. According to sociologist Sibylle Gollac (2020), in households with children, men worked an average of 51 hours per week, with two-thirds of that time being paid work. Women worked an average of 54 hours per week, with two-thirds of that time consisting of unpaid work.
The balance of power theory in international relations suggests that states may secure their survival by preventing any one state from gaining enough military power to dominate all others. If one state becomes much stronger, the theory predicts it will take advantage of its weaker neighbors, thereby driving them to unite in a defensive coalition. Some realists maintain that a balance-of-power system is more stable than one with a dominant state, as aggression is unprofitable when there is equilibrium of power between rival coalitions. When threatened, states may seek safety either by balancing, allying with others against the prevailing threat; or bandwagoning, aligning themselves with the threatening power. Other alliance tactics include buck passing and chain-ganging. Realists have long debated how the polarity of a system impacts the choice of tactics; however, it is generally agreed that in bipolar systems, each great power has no choice but to directly confront the other. Along with debates between realists about the prevalence of balancing in alliance patterns, other schools of international relations, such as constructivists, are also critical of the balance of power theory, disputing core realist assumptions regarding the international system and the behavior of states.
=== Tumor suppression === It has also been proven to be a tumor suppressor for some tumors. It probably is aided by its action in upregulating thrombospondin, SPARC (osteonectin), and fibronectin. However it has also been speculated to aid in extravasation in circulating melanoma cells. In case of prostate cancer it has been shown to be expressed in cancer associated stroma but not in normal stroma and has been suggested to be of potential help for cancer specific drug targeting [1].
Sources: en.wikipedia.org
Small studies with human participants have been reported, chiefly in Russian-language journals, but they are limited in size and design. No large randomised controlled trial with published results is available.
The most reproducible biochemical observation comes from cultured cells, where the peptide was reported to raise telomerase activity. Whether this translates into measurable health effects in animals or humans is not established.
It is offered as a research chemical for laboratory use, which places it outside the approval pathways applied to medicines. Buyers should expect documentation to differ between suppliers.
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.