This is a working overview of epithalamin, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-06-10. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| 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 |
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Tenderness is a quality of meat gauging how easily it is chewed or cut. Tenderness is a desirable quality, as tender meat is softer, easier to chew, and generally more palatable than harder meat. Consequently, tender cuts of meat typically command higher prices. The tenderness depends on a number of factors including the meat grain, the amount of connective tissue, and the amount of fat. Tenderness can be increased by a number of processing techniques, generally referred to as tenderizing or tenderization.
In contrast with this limited scope, MOFs exhibit more diverse coordination geometries, polytopic linkers, and ancillary ligands (F−, OH−, H2O among others). It is also difficult to obtain zeolites with pore sizes larger than 1 nm, which limits the catalytic applications of zeolites to relatively small organic molecules (typically no larger than xylenes). Furthermore, mild synthetic conditions typically employed for MOF synthesis allow direct incorporation of delicate functionalities into the framework structures. Such a process would not be possible with zeolites or other microporous crystalline oxide-based materials because of the harsh conditions typically used for their synthesis (e.g., calcination at high temperatures to remove organic templates). Metal–organic framework MIL-101 is one of the most used MOFs for catalysis incorporating different transition metals such as Cr. However, the stability of some MOF photocatalysts in aqueous medium and under strongly oxidizing conditions is low. Zeolites still cannot be obtained in enantiopure form, which precludes their applications in catalytic asymmetric synthesis.
Sources: en.wikipedia.org
{\displaystyle {\begin{aligned}[][a_{0},a_{1},a_{2},a_{3}]&=[0.5,0.182536384941,0.039812283118,0.003684879001]\\[][b_{1},b_{2},b_{3},b_{4},b_{5},b_{6}]&=[1.960841785003,1.708677456715,0.856592986083,0.264996791567,0.049257843893,0.004640740133]\end{aligned}}}
The roots of modern bird collections are found in the 18th- and 19th-century explorations of Europeans intent on documenting global plant and animal diversity. It was a fashion to collect and display natural curiosities in Victorian England. Some wealthy cabinet naturalists were able to amass large collections using networks of field collectors. These early collections were not intended for scientific study and the collectors gave importance to aesthetics rather than scientific value. It grew into a more scientific pursuit much later.
=== Transmitter === The transmitter is the component of the Dexcom CGM system that is responsible for sending glucose data from the sensor to a compatible receiver, smartphone, or other monitoring device via Bluetooth, allowing users to view real-time glucose readings. Throughout previous iterations of the Dexcom CGM, the transmitter has typically been shaped like a pear. The Dexcom G7 and Stelo models feature a smaller, rounder design and integrate the sensor and transmitter into a single, disposable system.
Under various conditions, G-actin molecules polymerize into longer threads called "filamentous-" or "F-actin". These F-actin threads are typically composed of two helical strands of actin wound around each other, forming a 7 to 9 nanometer wide helix that repeats every 72 nanometers (or every 14 G-actin subunits). In F-actin threads, G-actin molecules are all oriented in the same direction. The two ends of the F-actin thread are distinct from one another. At one end – designated the (−) end – the ATP-binding cleft of the terminal actin molecule is facing outward. At the opposite end – designated (+) – the ATP-binding cleft is buried in the filament, contacting the neighboring actin molecule. As F-actin threads grow, new molecules tend to join at the (+) end of an existing F-actin strand. Conversely, threads tend to shrink by shedding actin monomers from the strand's (−) end. Some proteins, such as cofilin appear to increase the angle of turn, but again this could be interpreted as the establishment of different structural states. These could be important in the polymerization process. There is less agreement regarding measurements of the turn radius and filament thickness: while the first models assigned a length of 25 Å, current X-ray diffraction data, backed up by cryo-electron microscopy suggests a length of 23.7 Å. These studies have shown the precise contact points between monomers. Some are formed with units of the same chain, between the "barbed" end on one monomer and the "pointed" end of the next one.
== Structure of the compound == The pyrithione ligands, which are formally monoanions, are chelated to Zn2+ via oxygen and sulfur centers. In the crystalline state, zinc pyrithione exists as a centrosymmetric dimer (see figure), where each zinc is bonded to two sulfur and three oxygen centers. In solution, however, the dimers dissociate via scission of one Zn-O bond. This compound was first described in the 1930s. Pyrithione is the conjugate base derived from 2-mercaptopyridine-N-oxide (CAS# 1121-31-9), a derivative of pyridine-N-oxide.
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.