This is a working overview of tetrapeptide, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-03-12. Anything still debated is marked as such rather than presented as settled.
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.
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.
| 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 |
Stability depends strongly on pH, temperature and the presence of oxygen and trace metals. Cleavage of the backbone proceeds faster under neutral to alkaline conditions, whereas acidic solutions tend to slow that reaction. The aspartate and glutamate side chains can undergo deamidation or imide formation over time, generating closely related impurities. Published stability data specific to epitalon are sparse, so the usable life of a given solution is best regarded as an open question that depends on buffer composition, concentration and storage temperature.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography with ultraviolet detection, frequently near 214 nanometers where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the observed molecular mass and helps separate the intact peptide from truncated or modified forms. Amino acid analysis or tandem mass spectrometry can establish residue order. Purity is commonly quoted as an area percentage, yet such values are method-dependent, and comparisons between laboratories require matching column, gradient and detection wavelength.
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.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
At branch points, two or more separate reactions compete for the same reactant. This affects the isotopic composition of all products downstream of the branch point. To illustrate this, consider the network below: Here, the flux of material into pool B (φAB) is balanced by two fluxes, one into pool C and the other into pool D (φBC and φBD respectively). The mass balance for the heavier isotope in this system is represented by
Bowery Poetry is a performance space at Bowery and Bleecker Street. It was founded in 2001 as Bowery Poetry Club (BPC), and provided a home base for established and upcoming artists. It was founded by Bob Holman, owner of the building and former Nuyorican Poets Café Poetry Slam MC (1988–1996). The BPC featured regular shows by Amiri Baraka, Anne Waldman, Taylor Mead, Taylor Mali, along with open mic, gay poets, a weekly poetry slam, and an Emily Dickinson Marathon, amongst other events. The club closed in 2012 and reopened in 2013 as a shared performance space under the name "Bowery Poetry". Bowery Arts + Science presents poetry, and Duane Park presents alternative burlesque in this space.
α-Tocopherol-Binding Protein: Vitamin E is transported in plasma mainly by lipoproteins, but little is known about how it is transported intracellularly. Duttaroy identified a new α-tocopherol-binding protein with a molecular mass of 14.2 kDa found in the cytosol of the heart and liver. This protein specifically binds α-tocopherol more than δ- and γ-homologues but does not bind oleate. The binding is quick, reversible, and saturable, indicating a specialized role in the intracellular transport and metabolism of α-tocopherol.1–4 The discovery of these binding proteins is vital for understanding how α-tocopherol is distributed within cells and tissues. Since α-tocopherol is a powerful antioxidant, proper localization is crucial for protecting cellular membranes from oxidative damage. Disruptions in the function of these binding proteins could weaken the protective effects of α-tocopherol, potentially leading to cellular problems and contributing to various diseases. Duttaroy serves as Editor-In-Chief of the peer-reviewed journal Food & Nutrition Research, which has an Impact factor of 4.5 (2025). Duttaroy serves on the editorial boards of several other journals, including Prostaglandins Leukotrienes and Essential Fatty Acids, Nutrients, and European Journal of Lipid Science and Technology. Since 2022, Professor Duttaroy has been consistently ranked among the world's top 2% of scientists each year on Stanford/Elsevier's list.
Sources: en.wikipedia.org
Surface anatomy, or superficial anatomy, is the study of anatomical landmarks that can be identified readily from the contours or other reference points on the surface of the body. It is important in human anatomy: with knowledge of superficial anatomy, physicians gauge the position and anatomy of deeper structures. Common names of parts of the human body, from top to bottom:
The role of electricity in the nervous systems of animals was first observed in dissected frogs by Luigi Galvani, who studied it from 1791 to 1797. Galvani's results inspired Alessandro Volta to develop the Voltaic pile—the earliest-known electric battery—with which he studied animal electricity (such as electric eels) and the physiological responses to applied direct-current voltages. In the 19th century scientists studied the propagation of electrical signals in whole nerves (i.e., bundles of neurons) and demonstrated that nervous tissue was made up of cells, instead of an interconnected network of tubes (a reticulum). Carlo Matteucci followed up Galvani's studies and demonstrated that injured nerves and muscles in frogs could produce direct current. Matteucci's work inspired the German physiologist, Emil du Bois-Reymond, who discovered in 1843 that stimulating these muscle and nerve preparations produced a notable diminution in their resting currents, making him the first researcher to identify the electrical nature of the action potential. The conduction velocity of action potentials was then measured in 1850 by du Bois-Reymond's friend, Hermann von Helmholtz. Progress in electrophysiology stagnated thereafter due to the limitations of chemical theory and experimental practice. To establish that nervous tissue is made up of discrete cells, the Spanish physician Santiago Ramón y Cajal and his students used a stain developed by Camillo Golgi to reveal the myriad shapes of neurons, which they rendered painstakingly.
=== Diplomats === Hamzat Ahmadu - Nigerian diplomat, former ambassador to the Soviet Union, the United States of America and high commissioner to the Bahamas. Nuhu Bamalli - Former minister of foreign affairs Mohammed Sanusi Barkindo – 28th Secretary-General of OPEC. Ibrahim Gambari – (Fulani/Yoruba); Scholar and diplomat; Chief of Staff to the president; Under-Secretary-General / Special Adviser – Africa United Nations; former minister of foreign affairs, current chief of staff to the president of Nigeria. Amina J. Mohammed – (Fulani/English); Politician; Deputy Secretary-General of the United Nations; former Federal Minister of Environment, Nigeria. Tijjani Muhammad-Bande – Political scientist, administrator and career diplomat. Current president of the United Nations General Assembly, Permanent Representative of Nigeria to the UN, former VP of the UN General Assembly. Nura Abba Rimi - Nigeria's ambassador to the Arab Republic of Egypt, with concurrent accreditation to the State of Palestine and the State of Eritrea; former Presidential Liaison Officer. Ibrahim Sulu-Gambari – (Fulani/Yoruba); Nigerian judge and monarch. Current Emir of Ilorin, Nigeria. Yusuf Tuggar – Minister of Foreign Affairs. Aminu Bashir Wali - Former permanent representative to the United Nations, former minister of foreign affairs. Isa Wali - former Nigerian high commissioner to Ghana.
== History and disclosure == Novichok agents were designed as part of a Soviet program codenamed Foliant. Five Novichok variants are believed to have been adapted for military use. The most versatile is A-232 (Novichok-5). Novichok agents have never been used on the battlefield. The UK government determined that a Novichok agent was used in the poisoning of Sergei and Yulia Skripal in Salisbury, Wiltshire, England in March 2018. This was unanimously confirmed by four laboratories around the world, according to the OPCW. Novichok was also involved in the poisoning of a British couple in Amesbury, Wiltshire, four months later, believed to have been caused by residual nerve agent discarded after the Salisbury attack. The attacks led to the death of one person, left three others in a critical condition from which they recovered, and briefly hospitalised a police officer. The Russian government denies producing or researching agents "under the title Novichok". In September 2020, the German government said that opposition figure and anti-corruption activist Alexei Navalny, who was evacuated from Omsk to Berlin for treatment in late August after becoming ill during his flight, was poisoned by a Novichok agent. Novichok has been known to most Western intelligence services since the 1990s, and in 2016 Iranian chemists working at a university in Tehran synthesised five of the seven Novichok agents for analysis and produced detailed mass spectroscopy data which was added to the OPCW's Central Analytical Database.
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.
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.