AEDG raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-03-28. Anything still debated is marked as such rather than presented as settled.
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.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four residues, linear chain |
| Residue sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Calculated mass | 390.3 daltons | Value for the free, uncharged form |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility | Freely soluble in water | Often handled as a salt form |
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.
Residue composition is the property that most cleanly separates verified material from mislabelled samples. Alanine, glutamate, aspartate and glycine appear in that order from the N-terminus, and the two acidic residues sit in the middle of the chain. Because the peptide is short, it can be produced by solid-phase synthesis and characterised by mass spectrometry without ambiguity. Any reported sample whose measured mass departs substantially from 390 daltons is a different compound or a degraded mixture rather than epitalon.
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 most frequently cited proposed action is induction of telomerase, the enzyme that adds repeat sequences to chromosome ends. Cell-culture work from the originating group reported higher telomerase reverse transcriptase expression and measurable telomere elongation in human somatic cells after exposure. How a four-residue peptide would reach nuclear gene regulation is not established, and no cell-surface receptor or uptake route has been identified. Additional reports describe changes in melatonin secretion, antioxidant enzyme activity and lipid peroxidation in aged animals, but these findings remain mechanistically unconnected to the telomerase observation.
Published evidence comes mainly from Russian-language journals and from a single research group, with small sample sizes and limited independent replication. A few laboratories outside that group have examined related peptides and reported weaker or absent telomerase effects, so the central claim is best described as contested rather than settled. Rodent studies report modest changes in some ageing markers and in survival, but designs vary and control conditions are often sparse. No large randomised trial in humans has been published, and long-term safety data in healthy populations are correspondingly thin.
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.
=== DAPI === DAPI is a fluorescent nuclear stain, excited by ultraviolet light and showing strong blue fluorescence when bound to DNA. DAPI binds with A=T rich repeats of chromosomes. DAPI is also not visible with regular transmission microscopy. It may be used in living or fixed cells. DAPI-stained cells are especially appropriate for cell counting.
Glycogen synthesis is, unlike its breakdown, endergonic—it requires the input of energy. Energy for glycogen synthesis comes from uridine triphosphate (UTP), which reacts with glucose-1-phosphate, forming UDP-glucose, in a reaction catalysed by UTP—glucose-1-phosphate uridylyltransferase. Glycogen is synthesized from monomers of UDP-glucose initially by the protein glycogenin, which has two tyrosine anchors for the reducing end of glycogen, since glycogenin is a homodimer. After about eight glucose molecules have been added to a tyrosine residue, the enzyme glycogen synthase progressively lengthens the glycogen chain using UDP-glucose, adding α(1→4)-bonded glucose to the nonreducing end of the glycogen chain. The glycogen branching enzyme catalyzes the transfer of a terminal fragment of six or seven glucose residues from a nonreducing end to the C-6 hydroxyl group of a glucose residue deeper into the interior of the glycogen molecule. The branching enzyme can act upon only a branch having at least 11 residues, and the enzyme may transfer to the same glucose chain or adjacent glucose chains.
The station's exterior had become somewhat grimy, and due to its vast scale, the station was expensive to maintain. A renovation covered some of the grand columns with plastic and blocked off the spacious central hallway with a new ticket office. The Pennsylvania Railroad optioned the air rights, which called for the demolition of the head house and train shed, to be replaced by an office complex and a new sports complex, while the tracks of the station would remain untouched. Plans for the new Penn Plaza and Madison Square Garden were announced in 1962. In exchange for the air rights to Penn Station, the PRR would receive a smaller underground station at no cost and a 25 percent stake in the new Madison Square Garden Complex. Modern architects rushed to save the ornate building, but to no avail; demolition of the above-ground head house began in October 1963. A giant steel deck was placed over the tracks and platforms to allow rail service to continue during construction. Photographs of the day showed passengers waiting for trains even as the head house was demolished around them. This was possible because most of the rail infrastructure (including the waiting room, concourses, and boarding platforms) was below street level. The demolition of the Penn Station head house caused outrage internationally. "One entered the city like a god. One scuttles in now like a rat," the architectural historian Vincent Scully wrote after the removal of the original station.
== Health effects == There is inconclusive clinical data whether specific vitamin K2 supplementation confers any beneficial effects compared to vitamin K1 which is the most common form in supplements. In vitro studies show certain cellular effects of vitamin K2 in bone which are not observed with the K1 variant (including bone marrow stem cell (BMSC) proliferation, and stimulation of osteoblast differentiation). The effects of vitamin K2 appear to be accentuated when combined with vitamin D and in the setting of osteoporosis.
Brandenburg was created out of the major part of the Prussian province of that name Mecklenburg-Vorpommern was created out of the state of Mecklenburg (reunited out of Mecklenburg-Schwerin and Mecklenburg-Strelitz only in 1934) and the Western parts of the Prussian province of Pomerania Saxony (Sachsen) was augmented by the westernmost parts of the Prussian province of Lower Silesia. Also, the town of Reichenau was ceded to Poland. Saxony-Anhalt (Sachsen-Anhalt) was created out of most of the Prussian Province of Saxony and the Free State of Anhalt Thuringia (Thüringen) was augmented by neighbouring parts from the Prussian provinces of Saxony and Hesse-Nassau. In 1949, the Soviet occupation zone was transformed into the German Democratic Republic. The five Länder (and East Berlin, though the latter only with consultative votes) participated in the legislative branch through the Länderkammer ('Chamber of States'), which was elected by the Landtage (state parliaments). However, the Länder were not constituting entities forming a federal republic (as in West Germany) but rather decentralised administrative entities of a quasi-unitary state. As a nod to the legal fiction that East Berlin was still occupied territory, it was counted neither as part of Brandenburg, nor as a state in its own right. East Germany claimed Berlin as its capital, a status recognised by virtually all Eastern Bloc countries, and exercised de facto control over East Berlin.
Sources: en.wikipedia.org
Acupuncture practitioners should know, and be prepared to be responsible for, any substantial harm from treatments. Some acupuncture proponents argue that the long history of acupuncture suggests it is safe. However, there is an increasing literature on adverse events (e.g. spinal-cord injury). Acupuncture seems to be safe in people getting anticoagulants, assuming needles are used at the correct location and depth, but studies are required to verify these findings.
== Etymology == The English word frankincense derives from the Old French expression franc encens, meaning 'true incense', maybe with the sense of 'high quality incense'. The adjective franc in Old French meant 'noble, true', in this case perhaps 'pure'; although franc is ultimately derived from the tribal name of the Franks, it is not a direct reference to them in the word frankincense. The word for frankincense in the Koine Greek of the New Testament, λίβανος, líbanos (or λιβανωτός, libanōtós), is cognate with the name of Lebanon (Greek: Λίβανος); the same can be said with regard to Arabic, Phoenician, Hebrew, and Vulgar Latin: lĭbănus. This is postulated to be because they both derive from the word for 'white' and that the spice route went via Mount Lebanon (Koine Greek: Λίβανος, romanized: Libanos). Medieval Latin: olibanum derived from λίβανος or libanus. The leading "o" may have come from Latin: oleum, lit. 'oil', or from the Greek article o- or Arabic article al-. Other names include Arabic: اللبان, romanized: al-lubān, Persian: کندر, romanized: kondor, Syriac: בוּסמִין, romanized: busmin, Hebrew: לבונה, romanized: ləvonā, Bengali: লোবান, ধুনো, romanized: lōban, dhunō, Somali: foox (fooḥ), Turkish: akgünlük, Classical Latin: tūs.
The use of venom across a wide variety of taxa is an example of convergent evolution. In animals, venom usage has evolved independently at least 104 times, across 8 phyla. It is difficult to conclude exactly how this trait came to be so intensely widespread and diversified. The multigene families that encode the toxins of venomous animals are actively selected, creating more diverse toxins with specific functions. Also, a number of animal species have been demonstrated to acquire venom toxins from other sources, notably from associated microbes, which may even inhabit their venom apparatuses. Venoms adapt to their environment and victims, evolving to become maximally efficient on a predator's particular prey (particularly the precise ion channels within the prey). Consequently, some venoms may become specialized to an animal's standard diet.
Haycocknema perplexum: [Internet]. Wildlifehealthaustralia.com.au. 2018 [cited 26 March 2018]. Available from: https://www.wildlifehealthaustralia.com.au/Portals/0/Documents/FactSheets/Public%20health/Haycocknema%20perplexum%20Mar%202008%20(1.1).pdf Albendazole [Internet]. Pubchem.ncbi.nlm.nih.gov. 2018 [cited 26 March 2018]. Available from: https://pubchem.ncbi.nlm.nih.gov/compound/albendazole#section=Top
Sources: en.wikipedia.org
Flawed technology: The real world performance of testing is much lower than that claimed by its promoters. Buon suggest that tests are probably adequate for rehabilitation and treatment situations, possibly adequate for pre-employment situations, but not for dismissing employees. Ethical Issues: Because of the fairly simple ways that an employee can invalidate the test, drug testing must be strictly monitored. This means that the specimen must be observed leaving the body. Many legal objections currently being raised in the courts about drug testing are pointing to legal requirements of prior notice, consent, due process, and cause. Wrong focus: As has been shown with Employee Assistance Programs, the focus of management concern should be on work performance decline. Buon suggests effective management practices are an infinitely better approach to managing workplace alcohol and other drug issues. Tony Buon has also reported by the CIPD as stating that "drug testing captures the stupid—experienced drug users know how to beat the tests". From a penological standpoint, one purpose of drug testing is to help classify the people taking the drug test within risk groups so that those who pose more of a danger to the public can be incapacitated through incarceration or other restrictions on liberty. Thus, the drug testing serves a crime control purpose even if there is no expectation of rehabilitating the drug user through treatment, deterring drug use through sanctions, or sending a message that drug use is a deviant behavior that will not be tolerated.
This article incorporates public domain material from The World Factbook (2025 ed.). CIA. (country: Honk Kong) Hong Kong from BBC News Key Development Forecasts for Hong Kong from International Futures Hong Kong in Transition (1995–2020) Archived 20 March 2025 at the Wayback Machine, an open access photographic archive of recent Hong Kong history Government
== Civilian applications == Depleted uranium has a very high density and is primarily used as shielding material for other radioactive material, and as ballast. Examples include sailboat keels, as counterweights and as shielding in industrial radiography cameras.
Typically, studies have reported finding no significant levels of Neanderthal DNA in Sub-Saharan Africans, but a 2020 study detected 0.3-0.5% in the genomes of five African sample populations, likely the result of Eurasians back-migrating and interbreeding with Africans, as well as human-to-Neanderthal gene flow from dispersals of Homo sapiens preceding the larger Out-of-Africa migration, and also showed more equal Neanderthal DNA percentages for European and Asian populations. Such low percentages of Neanderthal DNA in all present day populations indicate infrequent past interbreeding, unless interbreeding was more common with a different population of modern humans which did not contribute to the present day gene pool. Of the inherited Neanderthal genome, 25% in modern Europeans and 32% in modern East Asians may be related to viral immunity. In all, approximately 20% of the Neanderthal genome appears to have survived in the modern human gene pool. Due to their small population and resulting reduced effectivity of natural selection, Neanderthals accumulated several weakly harmful mutations, which were introduced to and slowly selected out of the much larger modern human population; the initial hybridised population may have experienced up to a 94% reduction in fitness compared to contemporary humans. By this measure, Neanderthals may have substantially increased in fitness. A 2017 study focusing on archaic genes in Turkey found associations with coeliac disease, malaria severity and Costello syndrome.
=== Transport === Like most of northwest London, Brent is served extensively by the London Underground. 21 tube stations are located in Brent, all served by either the Metropolitan, Jubilee, Bakerloo or Piccadilly Lines. All of them are surface level, with the exception of Kilburn Park tube station in the southeast of the borough. This number is the second highest of all London boroughs behind Westminster, which has 32 stations within its boundaries. The numerous London Underground, London Overground and National Rail stations in the borough are:
Sources: en.wikipedia.org
The peptide contains four residues in the order alanine, glutamate, aspartate and glycine, abbreviated AEDG. The chain is linear and held together by three peptide bonds. Its calculated mass for the uncharged free form is about 390.3 daltons.
Epithalamin refers to a crude preparation derived from bovine pineal tissue, which contains many components. Epitalon is a single synthetic tetrapeptide identified from that material and produced by chemical synthesis. The two names are sometimes confused because early reports treated the synthetic peptide as an active fragment of the extract.
It has been registered for clinical use in Russia, where it is associated with a small family of short peptides. In most other jurisdictions it is not an approved medicine and is traded as a research chemical. Regulatory status varies by country and changes over time.
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.