Everything below concerns pineal peptides. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-01-25. Numbers and descriptions here follow the published literature rather than marketing material.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
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.
The compound is generally presented as a synthetic fragment of epithalamin, a pineal gland extract investigated in the former Soviet Union from the 1970s onward. Vladimir Khavinson and colleagues in Saint Petersburg developed short peptides modelled on such extracts, and epitalon became the most widely cited of those sequences. Most primary reports appeared in Russian-language journals or in proceedings with limited international circulation. Independent replication in laboratories outside that network remains sparse, and much repeated secondary material traces back to a small number of originating groups.
Laboratory work has examined effects on telomerase activity in cultured cells, on melatonin rhythms in animals, and on markers of oxidative stress. Some experiments report measurable changes while others show none, and the reported findings rest largely on small studies. The absence of large independent trials means the generality of these results is unresolved rather than settled. Review articles occasionally apply the label geroprotector, a term that reflects a research hypothesis about ageing rather than an established clinical finding.
Epitalon is the common name for a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, usually abbreviated AEDG. All four residues are proteinogenic amino acids, and the free peptide has a calculated mass near 390 grams per mole. Because the chain is short and carries no modifications, it is assembled readily by solid-phase synthesis and is distributed mainly as a freeze-dried solid for laboratory work. Catalogue listings use the spellings epitalon, epithalone, and simply AEDG, and the three refer to the same sequence.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
The C-terminal domain binds to NADPH. It has a special structure, a Rossmann fold, whereby six-stranded twisted and parallel beta sheet with loops and alpha helices surrounding the core beta sheet. The Structure of Shikimate dehydrogenase is characterized by two domains, two alpha helices and two beta sheets with a large cleft separating the domains of the monomer. The enzyme is symmetrical. Shikimate dehydrogenase also has an NADPH binding site that contains a Rossmann fold. This binding site normally contains a glycine P-loop. The domains of the monomer show a fair amount of flexibility suggesting that the enzyme can open in close to bind with the substrate 3-Dehydroshikimate. Hydrophobic interactions occur between the domains and the NADPH binding site. This hydrophobic core and its interactions lock the shape of the enzyme even though the enzyme is a dynamic structure. There is also evidence to support that the structure of the enzyme is conserved, meaning the structure takes sharp turns in order to take up less space.
== Development and evolution == The formation of rete pegs (often referred to as rete ridges in developmental biology) is driven by an evolutionary and molecular mechanism entirely distinct from the development of other skin appendages like hair follicles and sweat glands. In mammals, the evolutionary acquisition of epidermal rete ridges closely coincides with the loss of fur density. It is proposed that mammals replaced the genetic program for forming discrete microscopic appendages with a distinct program that creates this interconnected appendage network. During morphogenesis, the development of rete pegs requires significant signaling interactions between epidermal and dermal cells. Specifically, the broad epidermal activation of bone morphogenetic protein (BMP) signaling is required to organize the ridge networks around the underlying dermal pockets. While mature scar tissue in adults typically lacks rete pegs (making it more prone to shearing), recent studies in neonatal mammals, such as pigs, demonstrate that these epidermal structures can regenerate de novo during early wound healing.
A myocardial infarction is usually clinically classified as an ST-elevation MI (STEMI) or a non-ST elevation MI (NSTEMI). These are based on ST elevation, a portion of a heartbeat graphically recorded on an ECG. STEMIs make up about 25–40% of myocardial infarctions. A more explicit classification system, based on international consensus in 2026, also exists. This classifies myocardial infarctions into three types:
Football Australia Limited, formerly named Football Federation Australia Limited (24 December 2004 – 27 November 2020) and Australian Soccer Association Limited (26 September 2003 – 24 December 2004) operates national teams, second-tier and some other competitions of soccer in Australia. It succeeded the Australian Soccer Federation which was formed in 1961. It is headquartered in Sydney. In 2000, its former A-League, W-League and Y-League were spun off to the commercial Australian Professional Leagues. Football Australia operates its men's, women's, youth, Paralympic, beach and its futsal national teams and its national coaching programs. Australian state and territory soccer federations are affiliated to it. It sanctions professional, semi-professional and amateur soccer in Australia. It is a member of the Asian Football Confederation (AFC) and ASEAN Football Federation (AFF).
Sources: en.wikipedia.org
==== Impact of UDI ==== The years following Rhodesia's UDI saw an unfolding series of economic, military, and political pressures placed on the country that eventually brought about majority rule, a totality of these factors rather than any one the reason for introducing change. In 2005, a conference at the London School of Economics that discussed Rhodesia's independence concluded that UDI was sparked by an existing racial conflict complicated by Cold War intrigues. Critics of UDI maintained that Ian Smith intended to safeguard the privileges of an entrenched colonial ruling class at the expense of the impoverished black population. Smith defended his actions by claiming that the black Rhodesian majority was too inexperienced at the time to participate in the complex administrative process of what was, by contemporary African standards, a reasonably industrialised state. At large, UDI further hardened the white population's attitudes towards majority rule and relations with the UK. A significant majority of white Rhodesian residents were either British immigrants or of British ancestry, and many held a special affection for the British Empire. However, the UK's refusal to grant them independence on their terms further confirmed their opposition to a political settlement on British terms, and fed their negative attitudes towards British interference in Rhodesian politics at large.
Below its Curie point of 770 °C (1,420 °F; 1,040 K), α-iron changes from paramagnetic to ferromagnetic: the spins of the two unpaired electrons in each atom generally align with the spins of its neighbors, creating an overall magnetic field. This happens because the orbitals of those two electrons (dz2 and dx2 − y2) do not point toward neighboring atoms in the lattice, and therefore are not involved in metallic bonding. In the absence of an external source of magnetic field, the atoms get spontaneously partitioned into magnetic domains, about 10 micrometers across, such that the atoms in each domain have parallel spins, but some domains have other orientations. Thus a macroscopic piece of iron will have a nearly zero overall magnetic field. Application of an external magnetic field causes the domains that are magnetized in the same general direction to grow at the expense of adjacent ones that point in other directions, reinforcing the external field. This effect is exploited in devices that need to channel magnetic fields to fulfill design function, such as electrical transformers, magnetic recording heads, and electric motors. Impurities, lattice defects, or grain and particle boundaries can "pin" the domains in the new positions, so that the effect persists even after the external field is removed – thus turning the iron object into a (permanent) magnet.
It is increased by a high-protein diet, by gastrointestinal bleeding (based on plasma protein level of 7.5 g/dl and a hemoglobin of 15 g/dl, 500 ml of whole blood is equivalent to 100 g protein), by catabolic processes such as fever or infection, and by antianabolic drugs such as tetracyclines (except doxycycline) or glucocorticoids. It is decreased by low-protein diet, malnutrition or starvation, and by impaired metabolic activity in the liver due to parenchymal liver disease or, rarely, to congenital deficiency of urea cycle enzymes. The normal subject on a 70 g protein diet produces about 12 g of urea each day. This newly synthesized urea distributes throughout total body water. Some of it is recycled through the enterohepatic circulation. Usually, a small amount (less than 0.5 g/day) is lost through the gastrointestinal tract, lungs, and skin; during exercise, a substantial fraction may be excreted in sweat. The bulk of the urea, about 10 g each day, is excreted by the kidney in a process that begins with glomerular filtration. At high urine flow rates (greater than 2 ml/min), 40% of the filtered load is reabsorbed, and at flow rates lower than 2 ml/min, reabsorption may increase to 60%. Low flow, as in urinary tract obstruction, allows more time for reabsorption and is often associated with increases in antidiuretic hormone (ADH), which increases the permeability of the terminal collecting tubule to urea. During ADH-induced antidiuresis, urea secretion contributes to the intratubular concentration of urea.
=== Wort cooling === After the whirlpool, the wort is cooled to the appropriate fermentation temperature before being transferred to the fermentation area. In modern breweries this is achieved through a plate heat exchanger. A plate heat exchanger has several ridged plates, which form two separate paths. The wort is pumped into the heat exchanger and goes through every other gap between the plates. The cooling medium, usually water from a cold liquor tank, goes through the other gaps. The ridges in the plates ensure turbulent flow. Wort is typically cooled in a plate heat exchanger from near boiling point to the appropriate pitching temperature. Cooling may use a single-stage system with chilled water, or a multi-stage system using water followed by a secondary coolant such as glycol. After cooling, the wort is oxygenated before fermentation to provide oxygen required for yeast development. While boiling, it is useful to recover some of the energy used to boil the wort. On its way out of the brewery, the steam created during the boil is passed over a coil through which unheated water flows. By adjusting the rate of flow, the output temperature of the water can be controlled. This is also often done using a plate heat exchanger. The water is then stored for later use in the next mash, in equipment cleaning, or wherever necessary. Another common method of energy recovery takes place during the wort cooling. When cold water is used to cool the wort in a heat exchanger, the water is significantly warmed.
Once the blood reaches the heart, it moves first into the right atrium, then the right ventricle to be pumped through the lungs for further gas exchange of carbon dioxide waste for oxygen. Oxygenated blood then flows from the lungs through the left atrium to the left ventricle where it is pumped out to the body.
Sources: en.wikipedia.org
=== State offices, regulations === Anti–money laundering office of the Philippines Anti-Money Laundering Office (Thailand) AMLCFT regulation in the United States US Anti–money laundering program (Patriot Act, Title III, Subtitle B Sec.352) Russian Federal Financial Monitoring Service ("Rosfinmonitoring") Australian Transaction Reports and Analysis Centre or AUSTRAC, Australian government agency, Australia's anti–money laundering and counter–terrorism financing regulator
== Medicinal uses == PSGAG is mostly used in dogs and horses for treating traumatic arthritis and degenerative joint disease (osteoarthritis). It has shown to be better at treating acute than chronic arthritis, though some studies say that its effectiveness in acute cases is still limited if degenerative enzymes have not played a role. While it is currently only FDA-approved for dogs and horses, PSGAG is also used off-label to treat lameness in swine, as a chondroprotectant ("joint protector") or treatment of interstitial cystitis in cats, and to treat arthritis in rabbits.
=== Pharmacodynamics === Chloral hydrate is metabolized in vivo to trichloroethanol, which is responsible for secondary physiological and psychological effects. The metabolite of chloral hydrate exerts its pharmacological properties via enhancing the GABA receptor complex and therefore is similar in action to benzodiazepines, nonbenzodiazepines and barbiturates. It can be moderately addictive, as chronic use is known to cause dependency and withdrawal symptoms. The chemical can potentiate various anticoagulants and is weakly mutagenic in vitro and in vivo. Chloral hydrate inhibits liver alcohol dehydrogenase in vitro. This could be an explanation of the synergeric effect seen with alcohol. Chloral hydrate is structurally and somewhat pharmacodynamically similar to ethchlorvynol, a pharmaceutical developed during the 1950s that was marketed as both a sedative and a hypnotic under the trade name Placidyl. In 1999, Abbott, the sole manufacturer of the drug in the United States at the time, decided to discontinue the product. After Abbott ceased production, the drug remained available for about a year. Despite the fact that it could have been manufactured generically, no other company in the United States chose to do so.
They built on the character of the Aperture Science facility, providing a deeper story for GLaDOS and Aperture's CEO Cave Johnson, as well as developing several concepts for "personality cores" that ultimately led to the creation of Wheatley. Portal 2 received similar acclaim to its predecessor at launch, garnering a Metacritic score of 95 out of 100. Valve has continued to support the game through the release of two separate downloadable content packages, one introducing a new co-operative campaign, and a second that incorporated an easy-to-learn level editor that allowed players to make their own test chambers and share these through the Steam Workshop to others. An alternate version of Portal 2 designed for educational use was developed for Valve's Steam for Schools program, and was made available for free. While experimenting with VR systems in 2017, Valve attempted to implement Portal-like gameplay, but early playtesters found the game's titular mechanic disorienting in VR. Valve instead returned to the Half-Life series and released Half-Life: Alyx in 2020. In April 2022, Erik Wolpaw urged Valve to make Portal 3, saying, "I am... not getting any younger. We are reaching the point where – it's crazy to think – [we're] literally going to be too old to work on Portal 3. So we should just do it." In September, Ellen McLain also called for Portal 3, stating that she was willing to star in it, and asked fans to "write in. Email Valve. You've got my blessing".
Sources: en.wikipedia.org
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
It is a four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine. The chain is unmodified and contains only standard proteinogenic residues, which makes it straightforward to produce by solid-phase synthesis and to characterise by standard peptide methods.