Epitalon is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-08-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four constituent residues |
| Molecular mass | About 390.35 Da | Monoisotopic value, confirmed by mass spectrometry |
| Residue sequence | Ala-Glu-Asp-Gly | Read from the N-terminus to the C-terminus |
| Common synonyms | Epithalon; AEDG | Both forms appear in reference catalogues |
| Net charge near neutral pH | Negative | Two acidic side chains give a low isoelectric point |
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.
Storage recommendations center on limiting moisture, heat, and light. The dry powder is generally kept at minus 20 degrees Celsius, and some suppliers recommend minus 80 degrees for long-term archival. Once dissolved, solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles, which can promote aggregation or degradation. Aqueous stability depends on pH and concentration, and buffered saline is often preferred over plain water for biological work. Stability data specific to epitalon remain limited, so general peptide-handling practices are applied by analogy rather than from product-specific validation.
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.
== Overdose == The incidence of overdose with ezetimibe is rare; subsequently, few data exist on the effects of overdose. However, an acute overdose of ezetimibe is expected to produce an exaggeration of its usual effects, leading to loose stools, abdominal pain, and fatigue.
General statistics indicate that 70–80 percent of women require direct clitoral stimulation (consistent manual, oral, or other concentrated friction against the external parts of the clitoris) to reach orgasm. Indirect clitoral stimulation (for example, by means of vaginal penetration) may also be sufficient for female orgasm. The area near the entrance of the vagina (the lower third) contains nearly 90 percent of the vaginal nerve endings, and there are areas in the anterior vaginal wall and between the top junction of the labia minora and the urinary meatus that are especially sensitive, but intense sexual pleasure, including orgasm, solely from vaginal stimulation is occasional or otherwise absent because the vagina has significantly fewer nerve endings than the clitoris. The prominent debate over the quantity of vaginal nerve endings began with Alfred Kinsey. Although Sigmund Freud's theory that clitoral orgasms are a prepubertal or adolescent phenomenon and that vaginal (or G-spot) orgasms are something that only physically mature females experience had been criticized before, Kinsey was the first researcher to harshly criticize the theory. Through his observations of female masturbation and interviews with thousands of women, Kinsey found that most of the women he observed and surveyed could not have vaginal orgasms, a finding that was also supported by his knowledge of sex organ anatomy. Scholar Janice M.
3 NH4SCN → 2 CH5N3 + H2S + CS2 The commercial route involves a two step process starting with the reaction of dicyandiamide with ammonium salts. Via the intermediacy of biguanidine, this ammonolysis step affords salts of the guanidinium cation (see below). In the second step, the salt is treated with base, such as sodium methoxide. Isothiouronium salts (S-alkylated thioureas) react with amines to give guanidinium salts:
Eyadéma died suddenly on 5 February 2005. According to the Togolese Constitution, after the president's death, the president of the National Assembly should become acting president. At the time of Eyadéma's death, the National Assembly president Fambaré Ouattara Natchaba was out of the country, and Gnassingbé was thus sworn in as president by the Togolese Army to "ensure stability". Many believe that Natchaba did not want to come back to Togo due to fears of assassination by the Gnassingbé clan. The army wanted him to resign his position and allow Gnassingbé to legally take over. The African Union denounced Gnassingbé's assumption of power as a military coup.
=== Trimer === Both liquid and gaseous SO3 exists in an equilibrium between the monomer and the cyclic trimer. The nature of solid SO3 is complex and at least 3 polymorphs are known, with conversion between them being dependent on traces of water. Absolutely pure SO3 freezes at 16.8 °C to give the γ-SO3 form, which adopts the cyclic trimer configuration [S(=O)2(μ-O)]3.
Sources: en.wikipedia.org
== Bibliography == Wolfram Saenger, Principles of Nucleic Acid Structure, 1984, Springer-Verlag New York Inc. Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, and Peter Walter Molecular Biology of the Cell, 2007, ISBN 978-0-8153-4105-5. Fourth edition is available online through the NCBI Bookshelf: link Jeremy M Berg, John L Tymoczko, and Lubert Stryer, Biochemistry 5th edition, 2002, W H Freeman. Available online through the NCBI Bookshelf: link Astrid Sigel; Helmut Sigel; Roland K. O. Sigel, eds. (2012). Interplay between Metal Ions and Nucleic Acids. Metal Ions in Life Sciences. Vol. 10. Springer. doi:10.1007/978-94-007-2172-2. ISBN 978-94-007-2171-5. S2CID 92951134.
Such a brilliant song. I'm very proud of Layne for writing it. When I've stepped up vocally in the past he's been so supportive, and here was a fine example of him stepping up with the guitar and writing a masterpiece. In 1994, Alice in Chains released their third EP, Jar of Flies. It debuted at number one, making it the first Alice in Chains release—and the first-ever EP—to do so. The other members of Alice in Chains, seeing Staley's deteriorating condition, opted not to tour in support of Jar of Flies. Following the album's release, Staley entered a rehabilitation clinic and began to work on a side project with several Seattle musicians, Mike McCready of Pearl Jam, Barrett Martin of Screaming Trees and John Baker Saunders of The Walkabouts. The band worked on material for several months and played its first show on October 12, 1994, at the Crocodile Cafe in Seattle under the name "The Gacy Bunch". Within a few weeks, the band changed its name to Mad Season. In January 1995, Mad Season performed two songs on Pearl Jam's Self-Pollution satellite radio broadcast, "Lifeless Dead" and "I Don't Know Anything". The band completed an album, titled Above, which was released in March 1995. The first single, "River of Deceit", became a modest success on alternative radio. A live performance filmed at the Moore Theatre in Seattle was released in August 1995 as a home video, Live at the Moore.
=== Amélie of Leuchtenberg === Amélie of Leuchtenberg (1812–1873) was Empress of Brazil as the wife of Emperor Pedro I (also King Pedro IV of Portugal). Between February and September 2012, researchers from the University of São Paulo exhumed her remains, along with those of Pedro I and his first wife, Maria Leopoldina. The investigation revealed that Amélie's body had been mummified, with her skin, hair, and internal organs preserved. Forensic examinations at the Hospital das Clínicas identified an incision in the jugular vein, used to inject aromatic substances such as camphor and myrrh during the original embalming. According to forensic archaeologist Valdirene Ambiel, the preservation was aided by the casket's hermetic seal, which prevented the growth of microorganisms. Before reinterment, the body was re-embalmed using methods similar to the original 19th-century process. The remains of Amélie, Pedro I, and Maria Leopoldina are interred within the crypt of the Monument to the Independence of Brazil in São Paulo.
Any untoward medical occurrence that at any dose: results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, or is a congenital anomaly/birth defect. (ICH E6) Sham therapy
Sources: en.wikipedia.org
For instance, oxycodone and diamorphine may be tested, both sedative analgesics. If such a test is not requested specifically, the more general test (in the preceding case, the test for opioids) will detect most of the drugs of a class, but the employer or physician will not have the benefit of the identity of the drug. Employment-related test results are relayed to a medical review office (MRO) where a medical physician reviews the results. If the result of the screen is negative, the MRO informs the employer that the employee has no detectable drug in the urine, typically within 24 hours. However, if the test result of the immunoassay and GC-MS are non-negative and show a concentration level of parent drug or metabolite above the established limit, the MRO contacts the employee to determine if there is any legitimate reason—such as a medical treatment or prescription. On-site instant drug testing is a more cost-efficient method of effectively detecting substance use amongst employees, as well as in rehabilitation programs to monitor patient progress. These instant tests can be used for both urine and saliva testing. Although the accuracy of such tests varies with the manufacturer, some kits have rates of accuracy correlating closely with laboratory test results.
Tuberous breasts (or tubular breasts) are a result of a congenital abnormality of the breasts which can occur in both men and women (also see Hypoplasia), one breast or both. During puberty breast development is stymied and the breasts fail to develop normally and fully. The exact cause of this is as yet unclear; however, a study in 2011 of the cells in the breasts of both males and females with tubular breasts suggested a genetic link in a disorder of collagen deposition. The condition is thought to affect one to five percent of breast augmentation patients; however, the proportion of the general population affected is unknown as surgery is not always sought.
pcALCL lesions exhibit large malignant T-cells or null cells (i.e. cells lacking many T-cell receptor proteins) with "Hallmark" cell features of anaplasia, pleomorphism, and kidney- and horse shaped-nuclei. These lesions are often limited to the dermis but can extend into the surrounding subcutaneous tissue and/or epidermis. Rarely, the lesions, termed pyrogenic variants, are rich in polymorphonuclear neutrophils. The neoplastic cells strongly express CD30 (100% of cases), CD2 (78%), CD4 (54–90% of cases), cytotoxicity marker proteins, and various other marker proteins that help distinguish it from other ALCL, cutaneous T-cell lymphomas, and cancers. While these cells typically are ALK-negative, they do express ALK-containing fusion proteins in rare cases. The latter cases have a relatively benign course compared to ALK-positive ALCL and are treated as variants of pcALCL rather than ALK-positive ALCL.
Sources: en.wikipedia.org
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.
No. The two spellings refer to the same tetrapeptide, and the difference reflects transliteration from Russian. Laboratories and catalogues use both forms interchangeably. The material is also indexed as AEDG, taken from the one-letter codes of its residues.
Epithalamin is a mixed preparation derived from animal pineal tissue and contains many peptides. Epitalon is one synthetic sequence chosen for study from that broader mixture. Statements about one do not transfer directly to the other.
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.