A practical reference on AEDG: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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.
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.
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four-residue sequence |
| Molar mass | About 390.35 g/mol | Free peptide, counter-ion not included |
| Appearance | White to off-white powder | Lyophilised solid from aqueous solution |
| Water solubility | Freely soluble | Short, polar peptide chain |
| Common synonyms | AEDG; epithalone | Catalogues use the names interchangeably |
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
In response to ecosystem disturbances, some sites have utilized earthworms to prepare soil for the return of native flora. Research from the Station d'écologie Tropicale de Lamto (Ivory Coast) asserts that the earthworms positively influence the rate of macroaggregate formation (Soil structure#Granular|granular structure), an important feature for soil structure. The stability of aggregates in response to water was also found to be improved when constructed by earthworms. Though not fully quantified yet, greenhouse gas emissions (carbon dioxide, nitrous oxide, methane) of earthworms, direct or mediated by their strong influence on soil microbial communities, likely contribute to global warming, especially since top-dwelling earthworms increase the speed of carbon cycles and have been spread by humans into many new geographies.
Californium-252 (Cf-252, 252Cf) undergoes spontaneous fission with a branching ratio of 3.09% and is used in small neutron sources. Fission neutrons have an energy range of 0 to 13 MeV with a mean value of 2.3 MeV and a most probable value of 1 MeV. This isotope produces high neutron emissions and has a number of uses in industries such as nuclear energy, medicine, and petrochemical exploration.
==== Seventh-day Adventist ==== The Seventh-day Adventist Church is well known for presenting a health message that recommends vegetarianism and expects adherence to the kosher laws in Leviticus 11. Obedience to these laws means abstinence from pork, shellfish, and other animals proscribed as "unclean". The church discourages its members from consuming alcoholic beverages, tobacco or illegal drugs (compare Christianity and alcohol). In addition, some Adventists avoid coffee, tea, cola, and other beverages containing caffeine. The pioneers of the Adventist Church had much to do with the common acceptance of breakfast cereals into the Western diet, and the "modern commercial concept of cereal food" originated among Adventists. John Harvey Kellogg was one of the early founders of Adventist health work. His development of breakfast cereals as a health food led to the founding of Kellogg's by his brother William. In both Australia and New Zealand, the church-owned Sanitarium Health and Wellbeing Company is a leading manufacturer of health and vegetarian-related products, most prominently Weet-Bix. Kellogg encouraged his students Daniel H. Kress and Lauretta E. Kress to study medicine together at the University of Michigan Medical School and become public advocates of vegetarianism; together they published an important vegetarian cookbook and became early founders of what was later Washington Adventist Hospital. Research funded by the U.S. National Institutes of Health has shown that the average Adventist in California lives 4 to 10 years longer than the average Californian.
Sources: en.wikipedia.org
Aden soon became an important transit port and coaling station for trade between British India and the Far East, and Europe. The commercial and strategic importance of Aden increased considerably when the Suez Canal opened in 1869. From then and until the 1960s, the Port of Aden was to be one of the busiest ship-bunkering, duty-free shopping, and trading ports in the world. In 1937, Aden was separated from British India to become a Crown colony, a status that it retained until 1963. It consisted of the port city of Aden and its immediate surroundings (an area of 192 km2 [74 sq mi]). The Aden Settlement, and later Aden Colony, also included the outlying islands of Kamaran (de facto), Perim and Kuria Muria (see map). Prior to 1937, Aden had been governed as part of British India (originally as the Aden Settlement under the Bombay Presidency, and then as a Chief Commissioner's province). Under the Government of India Act 1935 the territory was detached from British India, and was re-organised as a separate Crown colony of the United Kingdom; this separation took effect on 1 April 1937. Through the latter years of its existence, Aden Colony was plagued by civil unrest.
Phrixotoxins are peptide toxins derived from the venom of the Chilean copper tarantula Phrixotrichus auratus, also named Paraphysa scrofa. Phrixotoxin-1 and -2 block A-type voltage-gated potassium channels; phrixotoxin-3 blocks voltage-gated sodium channels. Similar toxins are found in other species, for instance the Chilean rose tarantula.
=== Relationship with Franz Ferdinand === Archduke Franz Ferdinand became heir presumptive (Thronfolger) to the throne of Austria-Hungary in 1896 after the deaths of his cousin Rudolf (in 1889) and his father Karl Ludwig (in 1896). The relationship between him and Franz Joseph had always been a fairly contentious one, which was further exacerbated when Franz Ferdinand announced his desire to marry Countess Sophie Chotek. The emperor would not even consider giving his blessing to the union, as Sophie was merely of noble rank, not dynastic rank. Although the emperor received letters from members of the imperial family throughout the fall and winter of 1899 beseeching him to relent, Franz Joseph stood his ground. He finally gave his consent in 1900. However, the marriage was to be morganatic, and any children of the marriage would be ineligible to succeed to the throne. The couple were married on 1 July 1900 at Reichstadt. The emperor did not attend the wedding, nor did any of the archdukes. After that, the two men disliked and mistrusted each other. His interactions with Franz Ferdinand were strained; the emperor's personal attendant recollected in his memoirs that: "thunder and lightning always raged when they had their discussions." Following the assassination of Franz Ferdinand and Sophie in 1914, Franz Joseph's daughter, Marie Valerie, noted that her father expressed his greater confidence in the new heir presumptive, his grandnephew Archduke Charles. The emperor admitted to his daughter, regarding the assassination: "For me, it is a relief from a great worry."
Sources: en.wikipedia.org
==== COVID-19 pandemic ==== In response to the COVID-19 pandemic, most Church's Chicken restaurants closed their dining rooms and continued their drive-thru, counter, takeout and delivery services. In March 2020, company executives announced a franchisee relief plan, where Church's Chicken franchisees could defer 50% of their royalties and ad fund contributions for the next four weeks.
=== Hoyle–Wickramasinghe model of panspermia === Throughout his career, Wickramasinghe, along with his collaborator Fred Hoyle, has advanced the panspermia hypothesis, that proposes that life on Earth is, at least in part, of extraterrestrial origin. The Hoyle–Wickramasinghe model of panspermia include the assumptions that dormant viruses and desiccated DNA and RNA can survive unprotected in space; that small bodies such as asteroids and comets can protect the "seeds of life", including DNA and RNA, living, fossilized, or dormant life, cellular or non-cellular; and that the collisions of asteroids, comets, and moons have the potential to spread these "seeds of life" throughout an individual star system and then onward to others. The most contentious issue around the Hoyle–Wickramasinghe model of the panspermia hypothesis is the corollary of their first two propositions that viruses and bacteria continue to enter the Earth's atmosphere from space, and are hence responsible for many major epidemics throughout history. Towards the end of their collaboration, Wickramasinghe and Hoyle hypothesised that abiogenesis occurred close to the Galactic Center before panspermia carried life throughout the Milky Way, and stated a belief that such a process could occur in many galaxies throughout the Universe.
== Expert reviews of the evidence == Letby has maintained that she is innocent of the offences for which she was convicted. Following the trials, a number of medical, statistical and other scientific experts have criticised the prosecution's evidence. The defence have been criticised for failing to call any of their own expert witnesses at trial. In 2025, a panel of experts convened by neonatologist Shoo Lee, provided with the infants' records and other trial evidence by Letby's legal representatives, published an assessment of the cases which presented alternative explanations for all of the deaths and collapses. The infants' families and the prosecution's lead expert witness have disputed these findings. The Court of Appeal has previously rejected challenges to the safety of the convictions.
This is a list of investigational hair loss drugs, or drugs that are currently under development for clinical use in the treatment of different forms of alopecia (hair loss), such as androgenetic alopecia (pattern hair loss) and alopecia areata (spot baldness), but are not yet approved. Chemical/generic names are listed first, with developmental code names, synonyms, and brand names in parentheses. The format of list items is "Name (Synonyms) – Route – Indication – Mechanism of Action [Reference]". This list was last comprehensively updated in July 2025. It is likely to become outdated with time.
Sources: en.wikipedia.org
It is a synthetic tetrapeptide built from alanine, glutamate, aspartate and glycine. The four residues are joined by standard peptide bonds, giving a linear chain rather than a branched structure.
The name derives from epithalamin, a pineal gland extract studied in the former Soviet Union. Researchers proposed that short fragments of that extract carried the biological activity of interest.
No major regulatory agency has approved it as a medicine. It is handled as a research chemical, and products sold under this name are not standardised drugs with defined clinical labelling.
It is based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.