This is a working overview of Pineal peptide, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-12-09. Anything still debated is marked as such rather than presented as settled.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
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.
Purity assessment of peptide reagents normally relies on reversed-phase high-performance liquid chromatography. A gradient of acetonitrile in water with trifluoroacetic acid, paired with a C18 stationary phase, separates the target tetrapeptide from truncated sequences and deletion analogues. Detection at 214 nanometres exploits absorbance of the peptide backbone, since the molecule contains no aromatic residue. Results are expressed as a percentage of total peak area. Values above ninety-five percent are typical for research-grade material, although reporting conventions vary between suppliers.
Identity confirmation uses mass spectrometry, usually electrospray ionisation in positive mode or matrix-assisted laser desorption. The protonated free peptide produces a signal near three hundred and ninety-one daltons, while salt adducts shift that value slightly. Tandem mass spectrometry or amino acid analysis supplies sequence-level confirmation, which a single mass measurement cannot. Peptides containing aspartate can cyclise into succinimide intermediates that hydrolyse to isoaspartate isomers of identical mass. Because those isomers are difficult to separate chromatographically, identity and purity results carry more weight when interpreted together.
Storage practice centres on limiting moisture, oxygen, and repeated temperature cycling. Freeze-dried powder is generally held desiccated at minus twenty degrees Celsius or colder and protected from light. Reconstituted solutions are markedly less stable, and the aspartate-glycine junction is prone to succinimide formation at neutral to mildly alkaline pH. Portioning material into single-use aliquots reduces degradation compared with repeated freeze-thaw cycles. Stability data specific to this tetrapeptide remain scarce, so most handling guidance is extrapolated from general peptide chemistry rather than measured directly.
| 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 |
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.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
Identity is normally established by reversed-phase high-performance liquid chromatography combined with mass spectrometry, a pairing that separates components and confirms molecular mass at once. Purity is quoted as a percentage from the chromatogram, and figures above ninety-five percent are a frequent commercial specification. Amino acid analysis or sequencing supplies further confirmation when required. Because many short peptides behave similarly under chromatography, retention time alone does not establish sequence; the mass measurement is what separates one tetrapeptide from another, and certificates should report both.
Short peptides such as AEDG are normally supplied as a freeze-dried solid and are kept dry, cold, and shielded from light. Holding at minus twenty degrees Celsius is common for the long term, while a refrigerator suffices for brief periods before use. The material takes up moisture to some degree, so containers should stay sealed and be allowed to reach room temperature before opening, which limits condensation on the contents. Repeated warming and cooling of a single container is discouraged because it admits water and can lower the amount of intact peptide.
The peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
Published work on this compound consists mainly of in vitro experiments, animal studies, and small clinical investigations, a substantial share of which appeared in Russian-language journals. Sample sizes are generally small, control conditions differ between studies, and several endpoints rely on markers whose clinical meaning is itself debated. Reviews of the longevity field treat the peptide as an early example of telomerase-directed research rather than an established intervention. Regulatory treatment varies by country: some jurisdictions place it under prescription controls, others treat it as a laboratory material, and importation may be restricted regardless of local status.
=== Identification of liver as an anti-anemia food === During the 1920s, George Whipple discovered that ingesting large amounts of raw liver seemed to most rapidly cure the anemia of blood loss in dogs, and hypothesized that eating liver might treat pernicious anemia. Edwin Cohn prepared a liver extract that was 50 to 100 times more potent in treating pernicious anemia than the natural liver products. William Castle demonstrated that gastric juice contained an "intrinsic factor" which when combined with meat ingestion resulted in absorption of the vitamin in this condition. In 1934, George Whipple shared the 1934 Nobel Prize in Physiology or Medicine with William P. Murphy and George Minot for discovery of an effective treatment for pernicious anemia using liver concentrate, later found to contain a large amount of vitamin B12.
=== Genetics === Malignant hyperthermia's inheritance is autosomal dominant with variable penetrance. The defect is typically located on the long arm of chromosome 19 (19q13.2) involving the ryanodine receptor. More than 25 different mutations in this gene are linked with malignant hyperthermia. These mutations tend to cluster in one of three domains within the protein, designated MH1-3. MH1 and MH2 are located in the N-terminus of the protein, which interacts with L-type calcium channels and Ca2+. MH3 is located in the transmembrane forming C-terminus. This region is important for allowing Ca2+ passage through the protein following opening. Chromosome 7q and chromosome 17 have also been implicated. It has also been postulated that MH and central core disease may be allelic and thus can be co-inherited.
== Structure == ABCC1 is a 190 kDa protein that contains two membrane-spanning domains of hydrophobic nature and two nucleotide binding domains. Each membrane-spanning domain is made up of six α-helices. In addition, the protein also contains a third membrane-spanning domain that sets it apart from other transporters within the ATP-binding cassette family of transporters. The two nucleotide binding domains have a functional asymmetry that plays a significant role in the ability of ATP to power the transporter. The first nucleotide binding domain, which is delegated NBD1, is responsible for the strong attraction of ATP to the transporter. The second nucleotide binding domain, NBD2, is the domain responsible for the hydrolysis of ATP. This asymmetry is specific to the C subfamily of ABC transporters and is generally not found in other transporters. ABCC1 is a highly conserved gene with polymorphisms occurring at very low frequencies of less than five percent. Polymorphisms in this gene are generally found in the form of a single-nucleotide polymorphism (SNP). The greatest ethnic differences in polymorphisms within the ABCC1 are found between Caucasian and Asian populations. There are multiple examples of single nucleotide polymorphisms that are shared among Asian populations but not found in Caucasian populations and vice versa.
== Other animals == The interscapular brown adipose tissue is commonly referred to as the hibernating gland. Whilst believed by many to be a type of gland, it is actually a collection of adipose tissues lying between the scapulae of rodentine mammals. Composed of brown adipose tissue and divided into two lobes, it resembles a primitive gland, regulating the output of a variety of hormones. The function of the tissue appears to be involved in the storage of medium to small lipid chains for consumption during hibernation, the smaller lipid structure allowing for a more rapid path of energy production than glycolysis. In studies where the interscapular brown adipose tissue of rats were lesioned, it was demonstrated that the rats had difficulty regulating their normal body-weight. The longest-lived small mammals, bats (30 years) and naked mole rats (32 years), all have remarkably high levels of brown adipose tissue and brown adipose tissue activity. However, brown fat is unlikely to play a role in body temperature regulation of many large-bodied mammals as the UCP1 gene, encoding for the key thermogenic protein of the tissue, has been inactivated in several lineages (e.g. horses, elephants, sea cows, whales and hyraxes). A reduced surface area to volume ratio among large-bodied species decreases heat loss in the cold, diminishing thermogenic demands required to defend body temperatures. UCP1 loss in other species (e.g. pangolins, armadillos, sloths and anteaters) may be linked to selection pressures favouring low metabolic rates.
=== E-liquid === The mixture used in vapor products such as e-cigarettes is called e-liquid. E-liquid formulations vary widely. A typical e-liquid contains propylene glycol and glycerin (95%) with a combination of flavorings, nicotine, and other additives (5%). The flavorings may be natural, artificial, or organic. When e-liquids are heated, by-products such as formaldehyde, acetaldehyde, and acrolein can form, at levels that depend on operating conditions and liquid composition. There are many e-liquid makers and more than 15,000 flavors. The e-liquid usually contains nicotine from tobacco, but some products use non-tobacco nicotine, including synthetic lab-made nicotine. Many e-liquids use nicotine salts made by adding organic acids such as benzoic acid to nicotine, so as to reduce throat irritation. Some e-liquids also contain synthetic cooling agents. Many countries regulate what e-liquids can contain. In the US, there are Food and Drug Administration (FDA) compulsory manufacturing standards and American E-liquid Manufacturing Standards Association (AEMSA) recommended manufacturing standards. European Union standards are published in the EU Tobacco Products Directive.
Sources: en.wikipedia.org
== Causes == DEB is caused by genetic defects (or mutations) within the human COL7A1 gene encoding the protein type VII collagen (collagen VII). DEB-causing mutations can be either dominant or recessive. Most families with family members with this condition have distinct mutations. Collagen VII is a very large molecule (300 kDa) that dimerizes to form a semicircular looping structure: the anchoring fibril. Anchoring fibrils are thought to form a structural link between the epidermal basement membrane and the fibrillar collagens in the upper dermis.
== 2023 UFC Honors awards == Starting in 2019, the UFC created year-end awards with "UFC Honors President's Choice Awards" for categories "Performance of the Year" and "Fight of the Year" being chosen by UFC CEO Dana White. The other "UFC Honors Fan Choice Awards" are for categories "Knockout of the Year", "Submission of the Year", "Event of the Year", "Comeback of the Year" and, from 2020, "Debut of the Year" in which fans are able to vote for the winner on social media. Winners receive a trophy commemorating their achievement along with a set of tires from sponsor Toyo Tires.
George Rennie (1801 or 1802 in Phantassie, East Lothian – 1860 in London), sculptor, politician and governor Mary Ellaline Terriss, Lady Hicks (1871 in Stanley – 1971 (aged 100) in Hampstead, London), known professionally as Ellaline Terriss, a popular English actress and singer, best known for her performances in Edwardian musical comedies Edward Binnie (1884 in Stanley – 1956 in Sandefjord, Norway), the second resident magistrate of South Georgia, serving from October 1914 to April 1927, when he resided at King Edward Point; previously served as customs officer on East Falkland Island McDonald Hobley (1917 in Stanley – 1987), one of the first BBC Television continuity announcers from 1946 to 1956 Sir Rex Hunt CMG (1926 in Redcar – 2012 in Stockton on Tees), Governor during the Falklands War Gerald Reive (born 1937 in the Falkland Islands), a New Zealand-based athlete, a lawn bowler at the 2010 Commonwealth Games Terry Peck MBE, CPM (1938 – 2006 both in Stanley), soldier, policeman and legislator Edward Neill "Ted" Baker CNZM (born 1942 in Stanley), a New Zealand scientist specialising in protein purification and crystallization and bioinformatics Alejandro Betts (1947 – 2020), a Falklands-born Argentine air-traffic controller, notable for being the only Falkland Islander to support Argentina's claim to the Falkland Islands Mensun Bound (born 1953 in Port Stanley) is a British marine archaeologist, based in Oxford, Triton Senior Research Fellow in Marine Archaeology at Oxford University James Peck (born 1968 in Stanley), an artist and writer who at one time held both Argentine and British citizenship but has since renounced his Argentine citizenship.
== Diagnosis == The diagnosis of androgenic alopecia can usually be established based on clinical presentation in men. In women, the diagnosis usually requires a more complex diagnostic evaluation. Further evaluation of the differential requires exclusion of other causes of hair loss, and assessing for the typical progressive hair loss pattern of androgenic alopecia. Trichoscopy can be used for further evaluation. Biopsy may be needed to exclude other causes of hair loss, and histology would demonstrate perifollicular fibrosis. The Hamilton–Norwood scale has been developed to grade androgenic alopecia in males by severity.
Sources: en.wikipedia.org
A comparative genomic study (in 2020) analyzed 494 complete genomes from the Pseudomonas genus, of which 189 were P. aeruginosa strains. The study observed that their protein count and GC content ranged between 5500 and 7352 (average: 6192) and between 65.6 and 66.9% (average: 66.1%), respectively. This comparative analysis further identified 1811 aeruginosa-core proteins, which accounts for more than 30% of the proteome. The higher percentage of aeruginosa-core proteins in this latter analysis could partly be attributed to the use of complete genomes. Although P. aeruginosa is a very well-defined monophyletic species, phylogenomically and in terms of ANIm values, it is surprisingly diverse in terms of protein content, thus revealing a very dynamic accessory proteome, in accordance with several analyses. It appears that, on average, industrial strains have the largest genomes, followed by environmental strains, and then clinical isolates. The same comparative study (494 Pseudomonas strains, of which 189 are P. aeruginosa) identified that 41 of the 1811 P. aeruginosa core proteins were present only in this species and not in any other member of the genus, with 26 (of the 41) being annotated as hypothetical. Furthermore, another 19 orthologous protein groups are present in at least 188/189 P. aeruginosa strains and absent in all the other strains of the genus.
The taste of kopi luwak varies with the type and origin of the excreted beans, processing, roasting, aging, and brewing. The ability of the civet to select its berries, and other aspects of the civet's diet and health, like stress levels, may also influence the processing and, hence taste. Within the coffee industry, kopi luwak is widely regarded as a gimmick or novelty item. The Specialty Coffee Association of America (SCAA) states that there is a "general consensus within the industry...it just tastes bad". A coffee professional compared the same beans with and without the kopi luwak process using a rigorous coffee cupping evaluation. He concluded: "It was apparent that luwak coffee sold for the story, not superior quality...Using the SCAA cupping scale, the luwak scored two points below the lowest of the other three coffees. It would appear that the luwak processing diminishes good acidity and flavor and adds smoothness to the body, which is what many people seem to note as a positive to the coffee." Professional coffee tasters were able to distinguish kopi luwak from other coffee samples, but remarked that it tasted "thin". Some critics claim more generally that kopi luwak is simply bad coffee, purchased for novelty rather than taste. A food writer reviewed kopi luwak available to American consumers and concluded, "It tasted just like...Folgers. Stale. Lifeless. Petrified dinosaur droppings steeped in bathtub water.
=== Adulteration === Despite attempts at quality control and standardisation, an extensive history of saffron adulteration, particularly among the cheapest grades, continues into modern times. Adulteration was first documented in Europe's Middle Ages, when those found selling adulterated saffron in Nuremberg were executed under the Safranschou code. Typical methods include mixing in extraneous substances like beetroot, pomegranate fibres, red-dyed silk fibres, or the saffron crocus's tasteless and odourless yellow stamens. Other methods included dousing saffron fibres with viscid substances like honey or vegetable oil to increase their weight. Powdered saffron is more prone to adulteration, with turmeric, paprika, and other powders used as diluting fillers. Adulteration can also consist of selling mislabelled mixes of different saffron grades. Thus, high-grade Kashmiri saffron is often sold and mixed with cheaper Iranian imports; these mixes are then marketed as pure Kashmiri saffron. Safflower is a common substitute sometimes sold as saffron. The spice is reportedly counterfeited with horse hair, corn silk, or shredded paper. Tartrazine or sunset yellow dyes have been used to colour counterfeit powdered saffron. In recent years, saffron adulterated with the colouring extract of gardenia fruits has been detected in the European market. This form of fraud is difficult to detect due to the presence of flavonoids and crocines in the gardenia-extracts similar to those naturally occurring in saffron.
Birds' diets are varied and often include nectar, fruit, plants, seeds, carrion, and various small animals, including other birds. The digestive system of birds is unique, with a crop for storage and a gizzard that contains swallowed stones for grinding food to compensate for the lack of teeth. Some species such as pigeons and some psittacine species do not have a gallbladder. Most birds are highly adapted for rapid digestion to aid with flight. Some migratory birds have adapted to use protein stored in many parts of their bodies, including protein from the intestines, as additional energy during migration. Birds that employ many strategies to obtain food or feed on a variety of food items are called generalists, while others that concentrate time and effort on specific food items or have a single strategy to obtain food are considered specialists. Avian foraging strategies can vary widely by species. Many birds glean for insects, invertebrates, fruit, or seeds. Some hunt insects by suddenly attacking from a branch. Those species that seek pest insects are considered beneficial 'biological control agents' and their presence encouraged in biological pest control programmes. Combined, insectivorous birds eat 400–500 million metric tons of arthropods annually. Nectar feeders such as hummingbirds, sunbirds, lories, and lorikeets amongst others have specially adapted brushy tongues and in many cases bills designed to fit co-adapted flowers.
The Pakistan–United States trade deal was concluded with a bilateral deal in Washington D.C. after intensive negotiations in July 2025, involving Pakistan's Finance Minister Muhammad Aurangzeb and Foreign Minister Ishaq Dar, alongside U.S. Trade Representative Jamieson Greer and Commerce Secretary Howard Lutnick. On 30–31 July 2025, President Donald Trump publicly confirmed the agreement via social media, calling it a "historic" energy partnership. Prime Minister Shehbaz Sharif hailed it as a "landmark deal" enhancing their enduring partnership.
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.
Reversed-phase high-performance liquid chromatography with ultraviolet detection at 214 nanometres is the usual approach. Peak area percentage provides a purity figure relative to other components in the sample. Mass spectrometry is then applied to confirm identity.