Everything below concerns Epithalamin. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-27. 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.
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.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
| 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.
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.
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.
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.
The southern part of Africa was dominated in the 19th century by a set of struggles to create within it a single unified state. In 1868, Britain annexed Basutoland in the Drakensberg Mountains, following an appeal from Moshoeshoe I, the king of the Sotho people, who sought British protection against the Boers. While the Berlin Conference of 1884–1885 sought to draw boundaries between the European powers' African possessions, it also set the stage for further scrambles. Britain attempted to annex first the South African Republic in 1880, and then, in 1899, both the South African Republic and the Orange Free State. In the 1880s, Bechuanaland (modern Botswana) became the object of a dispute between the Germans to the west, the Boers to the east, and Britain's Cape Colony to the south. Although Bechuanaland had no economic value, the "Missionaries Road" passed through it towards territory farther north. After the Germans annexed Damaraland and Namaqualand (modern Namibia) in 1884, Britain annexed Bechuanaland in 1885. By 1877, the Transvaal government under President Thomas François Burgers was completely bankrupt due to the failed Pedi War and mounting foreign debts. When British official Sir Theophilus Shepstone annexed the republic in April of that year, the state treasury contained only 12 shillings and 6 pence. In the First Boer War of 1880–1881 the Boers of the Transvaal Republic proved skilful fighters in resisting Britain's attempt at annexation, causing a series of British defeats.
=== Amphibian === The unfertilized oocyte of a frog, or Xenopus laevis, has also been utilized as an expression system for heterologous expression. Initially used to express the acetylcholine receptor in 1982, since then it has been used for a variety of reasons. These oocytes are produced by frogs year round and thus are relatively abundant, and translation occurs with high fidelity. Of the many limitations to the oocyte system, one major one is that the produced heterologous proteins interact with the frog oocyte's proteins which changes its behavior compared to what it would be in a mammalian cell. Additionally, where mammals are diploid, these xenopus have four homologous copies of each chromosome and thus, proteins derived may have a different function. More research is needed to examine the protein production of X. laevis systems.
==== Endogenous DMT ==== N,N-Dimethyltryptamine (DMT), a psychedelic compound identified endogenously in mammals, is biosynthesized by aromatic L-amino acid decarboxylase (AADC) and indolethylamine-N-methyltransferase (INMT). Studies have investigated brain expression of INMT transcript in rats and humans, coexpression of INMT and AADC mRNA in rat brain and periphery, and brain concentrations of DMT in rats. INMT transcripts were identified in the cerebral cortex, pineal gland, and choroid plexus of both rats and humans via in situ hybridization. Notably, INMT mRNA was colocalized with AADC transcript in rat brain tissues, in contrast to rat peripheral tissues where there existed little overlapping expression of INMT with AADC transcripts. Additionally, extracellular concentrations of DMT in the cerebral cortex of normal behaving rats, with or without the pineal gland, were similar to those of canonical monoamine neurotransmitters including serotonin. A significant increase of DMT levels in the rat visual cortex was observed following induction of experimental cardiac arrest, a finding independent of an intact pineal gland. These results show for the first time that the rat brain is capable of synthesizing and releasing DMT at concentrations comparable to known monoamine neurotransmitters and raise the possibility that this phenomenon may occur similarly in human brains. The first claimed detection of endogenous DMT in mammals was published in June 1965: German researchers F. Franzen and H.
Low complexity regions (LCRs) in protein sequences, also defined in some contexts as compositionally biased regions (CBRs), are regions in protein sequences that differ from the composition and complexity of most proteins that is normally associated with globular structure. LCRs have different properties from normal regions regarding structure, function and evolution.
== Wallerian degeneration slow == Mice belonging to the strain C57BL/Wlds have delayed Wallerian degeneration, and, thus, allow for the study of the roles of various cell types and the underlying cellular and molecular processes. Current understanding of the process has been possible via experimentation on the Wlds strain of mice. The mutation occurred first in mice in Harlan-Olac, a laboratory producing animals the United Kingdom. The Wlds mutation is an autosomal-dominant mutation occurring in the mouse chromosome 4. The gene mutation is an 85-kb tandem triplication, occurring naturally. The mutated region contains two associated genes: nicotinamide mononucleotide adenylyltransferase 1 (NMNAT1) and ubiquitination factor e4b (UBE4B). A linker region encoding 18 amino acids is also part of the mutation. The protective effect of the WldS protein has been shown to be due to the NMNAT1 region's NAD+ synthesizing active site. Although the protein created localizes within the nucleus and is barely detectable in axons, studies suggest that its protective effect is due to its presence in axonal and terminal compartments. The protection provided by the WldS protein is intrinsic to the neurons and not surrounding support cells, and is only locally protective of the axon, indicating an intracellular pathway is responsible for mediating Wallerian degeneration.
Sources: en.wikipedia.org
Chronic idiopathic constipation (difficult or infrequent passage of stools that lasts for 3 months or longer and is not caused by diet, disease, or drugs). Constipation caused by certain opioid (narcotic) pain medications in people with chronic (ongoing), noncancer pain, or in patients with long-lasting pain caused by a previous cancer or its treatment who do not need weekly increases in opioid dosage. The effectiveness of lubiprostone has not been established in patients who are taking a diphenylheptane opioid (e.g., methadone). Irritable bowel syndrome with constipation (IBS-C; a condition that causes stomach pain or cramps, bloating, and infrequent or difficult passage of stools) in women who are at least 18 years of age. Lubiprostone has not been studied in children. There is current research under way to determine the safety and efficacy in postoperative bowel dysfunction. It comes in a liquid filled capsule and is available only with a doctor's prescription. If one misses a dose it should be taken as soon as possible unless it is almost time for the next dose, in which case it should be skipped and the user should return to their regular dosing schedule.
=== Personal life === Ethel Florey's health deteriorated. She had hypertension and respiratory and heart problems, and walked with a stick. She travelled to Australia one more time in 1965 to give lectures on penicillin, but collapsed in Canberra and was hospitalised in Sydney. She recovered sufficiently to return to Oxford. When she found out that her son Charles was getting married at Fulton's house in New Haven in 1966, she wanted to attend. Florey refused to pay for this; if she collapsed in the United States the cost of medical care would be astronomical. Robert Webb, an American friend from the Cambridge days arranged for US$5,000 (equivalent to $50,000 in 2025) of insurance cover to allow her to attend. She died in Oxford on 10 October 1966. On 6 June 1967, Florey married Margaret Jennings at the Old Register Office in St Giles', Oxford, in a ceremony deliberately kept as quiet as possible. The only other persons present were Jim Kent and Cecilia Little, Jennings's housekeeper, who acted as witnesses. There was a small celebration in Florey's rooms at Queen's College and they honeymooned in the Caribbean before visiting Fulton in New Haven.
=== Tess Monroe === Tess Monroe (Sarah Clarke) is an FBI Senior Special Agent. After working with Tobias Fornell, Monroe joins NCIS in the hunt for British spy Jacob Scott during season thirteen. She participates in a shootout with the NCIS team that results in the intentional death of Trent Kort. Executive Producer Gary Glasberg described Monroe as "full of fire and cynicism and sarcasm and wit and energy and is extremely experienced". Tess has been divorced multiple times, but has no children. She "thinks of her team as her family. She's no-nonsense on the outside, but has a big heart underneath with a belief in honor, justice and doing what's right. She'll fight to protect the values she holds dear, and her team, with determination and a bit of sarcasm".
The addition of 1% cerium dioxide, as in gas mantles, heightens the effect by increasing emissivity in the visible region of the spectrum; but because cerium, unlike thorium, can occur in multiple oxidation states, its charge and hence visible emissivity will depend on the region on the flame it is found in (as such regions vary in their chemical composition and hence how oxidising or reducing they are). Several binary thorium chalcogenides and oxychalcogenides are also known with sulfur, selenium, and tellurium. All four thorium tetrahalides are known, as are some low-valent bromides and iodides: the tetrahalides are all 8-coordinated hygroscopic compounds that dissolve easily in polar solvents such as water. Many related polyhalide ions are also known. Thorium tetrafluoride has a monoclinic crystal structure like those of zirconium tetrafluoride and hafnium tetrafluoride, where the Th4+ ions are coordinated with F− ions in somewhat distorted square antiprisms. The other tetrahalides instead have dodecahedral geometry. Lower iodides ThI3 (black) and ThI2 (gold-coloured) can also be prepared by reducing the tetraiodide with thorium metal: they do not contain Th(III) and Th(II), but instead contain Th4+ and could be more clearly formulated as electride compounds. Many polynary halides with the alkali metals, barium, thallium, and ammonium are known for thorium fluorides, chlorides, and bromides.
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.
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.