This is a working overview of pineal peptides, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-06-12. Anything still debated is marked as such rather than presented as settled.
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.
Identity and purity are established with reversed-phase high-performance liquid chromatography and mass spectrometry. The chromatogram shows the main peak and any truncated or oxidised by-products, while the mass spectrum confirms the expected 390 dalton mass. Amino acid analysis can corroborate composition when a sample's origin is uncertain. Counterion content, particularly residual trifluoroacetate from purification, is frequently reported alongside purity because it shifts the net mass of the solid.
Reference material is normally supplied as a lyophilised powder in a sealed vial. Product literature typically recommends storage at minus twenty degrees Celsius or colder, protected from light and moisture. Freeze-thaw cycling is usually avoided because repeated condensation can introduce water into the vial. Working solutions are commonly prepared fresh, aliquoted, and kept cold for short periods rather than stored at ambient temperature. Labelling the date of opening helps track how long a vial has been in use.
| 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 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.
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.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
Freeze-dried epitalon is normally kept at minus twenty degrees Celsius in a sealed, desiccated container, protected from light. Short excursions at ambient temperature during shipping are generally tolerated, but repeated warming and cooling cycles encourage moisture uptake, which shortens shelf life. Once dissolved, the peptide is far less stable than the solid: aqueous solutions are subject to hydrolysis and to deamidation at the aspartate and glutamate residues. Working solutions are therefore held refrigerated and used within days, and repeated freezing and thawing of the same vial is best avoided.
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.
Verification of research-grade material involves comparing a supplier chromatogram against an in-house reference, checking the observed mass against the calculated value, and where possible confirming residue order by tandem mass spectrometry or enzymatic peptide mapping. Purity claims should be read alongside the method used to obtain them, because detection wavelength and integration settings alter the result. Batch-specific data, rather than a generic grade statement, is the informative part of a certificate.
Identity and purity of epitalon samples are normally established by reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, combined with mass spectrometry. The mass spectrum confirms the expected molecular ion and can reveal truncated or oxidised by-products. Amino acid analysis after acid hydrolysis verifies that the four residues are present in the expected ratio. Certificates typically report a purity figure taken from chromatographic peak area, expressed as a percentage of total integrated signal.
== Toxicity of related species == Illicium verum is not toxic. However, other related species are toxic. Japanese star anise (Illicium anisatum), a similar tree, is highly toxic and inedible; in Japan, it has instead been burned as incense. Cases of illness, including "serious neurological effects, such as seizures", reported after using star anise tea may be a result of deliberate economically motivated adulteration with this species. Japanese star anise contains the neurotoxin anisatin, which also causes severe inflammation of the kidneys (nephritis), urinary tract, and digestive organs when ingested. Swamp star anise Illicium parviflorum, a similar tree found in the southern United States, is highly toxic and should not be used for folk remedies or as a cooking ingredient.
== Death and legacy == On 7 February 2025, Antonov, at age 53, died in Paris from undisclosed causes. The news was first revealed on Marc Laidlaw's Instagram story a week later, and was confirmed in a statement from Eschatology Entertainment. Many of Antonov's former colleagues paid tribute to him on social media. Laidlaw and Raphaël Colantonio respectively wrote that he was a "visionary" who was "instrumental to the success of Arkane Studios". Ex-Valve writer Chet Faliszek said that he was a "breath of fresh air at Valve", and Arkane designer Harvey Smith praised his "dry, devastating wit". Valve artist Laura Dubuk recalled he was helpful as her mentor when she started at the company. Multiple outlets noted Antonov's influence on the games industry. Aftermath writer Luke Plunkett said that he was key "in defining the visual style of some of most visually-striking video games" ever, which, as John Walker wrote for Kotaku, are "some of the most loved games of all time". Engadget writer Igor Bonifacic claimed, "if there's one person who helped make Half-Life 2 so memorable, it's Antonov", and for Rock Paper Shotgun, Edwin Evans-Thirlwell said that City 17 "continues to influence more pessimistic sci-fi game developers today".
These glands are termed Von Ebner's glands which have also been shown to have another function in the secretion of histatins which offer an early defense (outside of the immune system) against microbes in food, when it makes contact with these glands on the tongue tissue. Sensory information can stimulate the secretion of saliva providing the necessary fluid for the tongue to work with and also to ease swallowing of the food.
Hahn remained modest and informal all his life. His disarming frankness, unfailing kindness, good common sense, and impish humour will be remembered by his many friends all over the world. The Royal Society in London wrote in an obituary:
== Minor leagues == Epstein was signed by the Orioles as an amateur free agent in 1964, receiving a $20,000 signing bonus. Epstein played for the Stockton Ports of the California League in 1965, and led the league in batting average (.338) and home runs (30; tying a league record set by Vince DiMaggio). He was named the league's Most Valuable Player (MVP). Rival manager Rocky Bridges nicknamed him "Super Jew" for his efforts that season. Epstein played for the Rochester Red Wings of the International League in 1966, batting .309 with 29 home runs and 102 runs batted in (RBIs), earning him league MVP and Rookie of the Year honors. He was also named an All Star and received The Sporting News Minor League Player of the Year Award and Topps Minor League Player of the Year Award.
Sources: en.wikipedia.org
Limosilactobacillus fermentum is a Gram-positive species in the heterofermentative genus Limosilactobacillus. It is associated with active dental caries lesions. It is also commonly found in fermenting animal and plant material including sourdough and cocoa fermentation. Some strains of lactobacilli formerly mistakenly classified as L. fermentum (such as RC-14) have since been reclassified as Limosilactobacillus reuteri.
=== Acquisition by Take-Two Interactive (2024–present) === Take-Two Interactive announced its plans to acquire Gearbox Entertainment and its intellectual properties from Embracer Group for $460 million on March 28, 2024, to be added under the 2K label. The acquisition also includes Gearbox Software with its satellite studios and Gearbox Publishing. Embracer will retain Gearbox San Francisco, Gearbox Shanghai, Lost Boys Interactive, Captured Dimensions, and Cryptic Studios, along with publishing rights to Remnant, Hyper Light Breaker, and other unannounced titles. Less than a day after the announcement, it was reported that an unknown number of employees were laid off from Gearbox. On June 12, 2024, Take-Two Interactive closed the Gearbox Software transaction.
At the initiation of treatment, GnRH agonists are associated with a "flare" effect on hormone levels due to acute overstimulation of the GnRH receptor. In men, LH levels increase by up to 800%, while testosterone levels increase to about 140 to 200% of baseline. Gradually however, the GnRH receptor desensitizes; testosterone levels peak after about 2 to 4 days, return to baseline after about 7 to 8 days, and are reduced to castrate levels within 2 to 4 weeks. Antigonadotropins such as estrogens and cyproterone acetate as well as nonsteroidal antiandrogens such as flutamide and bicalutamide can be used beforehand and concomitantly to reduce or prevent the effects of the testosterone flare caused by GnRH agonists. In contrast to GnRH agonists, GnRH antagonists, such as degarelix (Firmagon) and elagolix (Orilissa), work by binding to the GnRH receptor without activating it, thereby displacing GnRH from the receptor and preventing its activation. Unlike with GnRH agonists, there is no initial surge effect with GnRH antagonists; the therapeutic effects are immediate, with sex hormone levels being reduced to castrate levels within a few days. GnRH modulators are highly effective for testosterone suppression in transgender women and have few or no side effects when sex hormone deficiency is avoided with concomitant estrogen therapy. However, GnRH modulators tend to be very expensive (typically US$10,000 to US$15,000 per year in the United States), and are often denied by medical insurance.
Prior data before the current census, Bromley Town, 18.5% of the population was of minority ethnicity. The highest in the town was 19.3% in Plaistow and Sundridge, and the lowest was 8.3% in Hayes and Coney Hall.
Sources: en.wikipedia.org
Gone with the Wind itself may have been briefly overtaken by The Ten Commandments (1956), which closed at the end of 1960 with worldwide rentals of $58–60 million compared to Gone with the Wind's $59 million; if it did claim the top spot its tenure there was short-lived, since Gone with the Wind was re-released the following year and increased its earnings to $67 million. Depending on how accurate the estimates are, the 1959 remake of Ben-Hur may also have captured the record from Gone with the Wind: as of the end of 1961 it had earned $47 million worldwide, and by 1963 it was trailing Gone with the Wind by just $2 million with international takings of $65 million, ultimately earning $66 million from its initial release.
== Honors == Nier was a member of the National Academy of Sciences, the American Philosophical Society, the American Academy of Arts and Sciences, and a foreign scientific member of the Max Planck Society. The Martian crater Nier and the mineral nierite (tiny silicon nitride inclusions in meteorites) were named after him. The Nier Prize is awarded annually by the Meteoritical Society and recognizes outstanding research in meteoritics and closely allied fields by young scientists.
Over the course of their career, the band's sound has also been described as alternative metal, sludge metal, alternative rock, doom metal, and hard rock. Furthermore, the band have also incorporated styles including blues rock, folk rock, progressive rock, funk metal and jangle pop into their music. Regarding the band's constant categorization by the media, Cantrell stated: When we first came out we were metal. Then we started being called alternative metal. Then grunge came out and then we were hard rock. And now, since we've started doing this again I've seen us listed as: hard rock, alternative, alternative metal and just straight metal. I walked into an HMV the other day to check out the placement and see what's on and they've got us relegated back into the metal section. Right back where we started! Drummer Sean Kinney rejects the grunge label, stating in a 2013 interview "I mean, before we first came out there was no grunge, they hadn't invented that word. Before they invented the word grunge we were alternative rock and alternative metal and metal and rock, and we didn't give a shit whatever, we were a rock and roll band!" According to Mike Inez, they were always the metal stepchildren of the Seattle scene.
The wine yeast Brettanomyces (or "Brett") produces very distinctive aroma compounds, 4-Ethylphenol (4-EP) and 4-Ethylguaiacol (4-EG), that can have a wine being described as smelling like a "barnyard", "wet saddle" or "band-aid". To some winemakers and with some wine styles (such as Pinot noir from Burgundy), a limited amount of these compounds could be considered a positive attribute that adds to the complexity of wine. To other winemakers and with other wine styles (such as Riesling from the Mosel), the presence of any Brett will be considered a fault. Fruit flies are common vector in the transfer of Brettanomyces between tanks and even nearby wineries. As a fermentation yeast, Brettanomyces can usually ferment a wine up to 10–11% alcohol levels before they die out. Sometimes Brettanomyces already present in a wine that has been inoculated with Saccharomyces cerevisiae will out compete the Saccharomyces strain for nutrients and even inhibit it due to the high levels of acetic acid, decanoic acid and octanoic acid that many strains of Brettanomyces can produce. Once Brett is in a winery, it is very difficult to control even with strict hygiene and the discarding of barrels and equipment that has previously come into contact with "Bretty" wine. This is because many species of Brettanomyces can use a wide variety of carbon sources in wine and grape must, including ethanol, for metabolism. Additionally, Brett can produce a wide range of by-products that could influence the wine beyond just the 4-EP and 4-EG compounds previously discussed.
== External links == International Chemical Safety Card 0248 CDC – NIOSH Pocket Guide to Chemical Hazards Diatomite: Statistics and Information – USGS Tripolite: Tripolite mineral data Citat: "...A diatomaceous earth consisting of opaline silica..." Diatomaceous Earth: A Non Toxic Pesticide usgs.gov (Mineral Commodity Summaries 2025): Diatomite
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.
Sealed lyophilised powder is normally kept at minus twenty degrees Celsius or below, away from light and moisture. Vials are allowed to reach room temperature before opening to limit condensation. Repeated warming and cooling of the same vial is discouraged.