This is a working overview of thymalfasin, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-05-07. Anything still debated is marked as such rather than presented as settled.
Thymosin alpha-1 is a 28-residue peptide first isolated from thymus tissue in the 1970s. It corresponds to the N-terminal portion of thymosin beta-4, from which it is cleaved in vivo. The peptide carries an acetyl group at its N-terminus, a modification that affects its charge and stability. Synthetic material produced by solid-phase peptide synthesis is chemically identical to the natural fragment and is the form used in research and clinical studies.
Laboratory work indicates that the peptide acts on cells of both the innate and adaptive immune systems. Reported effects include signalling through Toll-like receptors on dendritic cells, enhanced T-cell maturation, and increased natural killer cell activity. These actions are described largely from cell-culture and animal experiments, and the precise receptor-level events remain incompletely defined. Studies in humans have generally measured immune markers rather than a single defined molecular target. The resulting picture remains partly descriptive.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
Thymosin alpha-1 is a short peptide of 28 amino acid residues first described in the 1970s as a component of thymic extracts. Its N-terminal residue carries an acetyl group, and the sequence is highly conserved across mammalian species. The peptide is not encoded as a standalone gene product; it is released by proteolytic cleavage from the N-terminus of prothymosin alpha, a larger acidic nuclear protein. That precursor relationship places it within a broader family of thymic and immune-associated peptides that have been studied for decades.
The activity of this peptide is generally described as immunomodulatory rather than directly antimicrobial. Experimental work links it to signaling through certain Toll-like receptors on dendritic cells and to downstream maturation of antigen-presenting cells. Reported effects include expansion of T cell subsets, shifts in cytokine profiles, and increased natural killer cell activity. These observations come largely from cell culture and animal models, and the precise receptor-level events in humans remain incompletely characterized.
The compound has been investigated as an adjunct in chronic viral hepatitis and as a vaccine adjuvant, with results that vary by study design and population. Regulators in some countries have approved a synthetic form for specific indications, while other agencies have not. Whether the peptide produces consistent clinical benefit across diverse patient groups is still an open question, and many trials have been small. Its status is therefore best described as investigational in many contexts and established only narrowly.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Peptide | 28 amino acid residues |
| Molecular weight | Approximately 3108 Da | Depends on acetylation state |
| N-terminal modification | Acetylated | Affects charge and stability |
| Natural source | Fragment of thymosin beta-4 | Cleaved in vivo |
| Sequence length | 28 residues | Synthetic form matches natural |
Most published studies on thymosin alpha-1 report changes in immune measurements rather than clinical outcomes, and findings differ across designs and populations. Whether the peptide signals through one defined receptor or through several less specific interactions remains an open question. Its reported circulation half-life of a few hours complicates comparison of dosing schedules across trials. Mechanistic claims are frequently drawn from isolated cell cultures, and how far those results extend to whole organisms is unresolved.
Thymosin alpha-1 is a synthetic peptide of 28 amino acids whose sequence matches the amino-terminal region of prothymosin alpha. The chain is acetylated at its first residue and contains one disulfide bridge between two cysteine residues, which folds the molecule into a compact loop. Its molecular formula, C129H215N33O55, corresponds to a monoisotopic mass of roughly 3,106 daltons. Material used in laboratories is made by solid-phase synthesis rather than isolated from animal tissue.
Early work on thymic extracts in the 1960s described a heat-stable acidic fraction containing many polypeptides. Separation of that mixture yielded individual components, and thymosin alpha-1 was named as one of them on the basis of assays for T-cell activity. The first preparations came from calf thymus, while subsequent research and clinical material has been chemically synthesized. Nomenclature in older papers is inconsistent, and the same peptide sometimes appears under different designations, which complicates literature searches.
Storage recommendations center on low temperature, dryness, and protection from repeated freezing and thawing. The intact powder is commonly held at 20 degrees below zero Celsius or colder, while a working solution is divided into single-use aliquots to limit freeze-thaw cycles. Buffered saline or phosphate-buffered saline at neutral pH is frequently used as a diluent. Light sensitivity is not well documented, yet amber vials or foil wrapping are common practice for long-term storage of peptide stocks.
Identity and purity are assessed with a small set of standard peptide methods. Reversed-phase high-performance liquid chromatography separates the main peak from truncated or oxidized species, and its area percentage is the usual purity measure. Mass spectrometry confirms the observed molecular mass against the expected value, while amino acid analysis or peptide mapping checks composition and sequence. Specifications for research-grade material are often stated as 95 percent or higher, though the exact limit depends on the supplier and the intended use.
== See also == Acidosis Acids in wine: tartaric, malic and citric are the principal acids in wine. Alkalosis Arterial blood gas Chemical equilibrium Conductivity (electrolytic) Grotthuss mechanism: how protons are transferred between hydronium ions and water molecules, accounting for the exceptionally high ionic mobility of the proton (animation). Hammett acidity function: a measure of acidity that is used for very concentrated solutions of strong acids, including superacids. Ion transport number Ocean acidification: dissolution of atmospheric carbon dioxide affects seawater pH. The reaction depends on total inorganic carbon and on solubility equilibria with solid carbonates such as limestone and dolomite. Law of dilution pCO2 pH Predominance diagram: relates to equilibria involving polyoxyanions. pKa values are needed to construct these diagrams. Proton affinity: a measure of basicity in the gas phase. Stability constants of complexes: formation of a complex can often be seen as a competition between proton and metal ion for a ligand, which is the product of dissociation of an acid.
Today, the "exteroceptors" are the organs that provide information originating outside the body, such as the eyes, ears, mouth, and skin. The interoceptors provide information about the internal organs, and the "proprioceptors" provide information about movement derived from muscular, tendon, and articular sources. Using Sherrington's system, physiologists and anatomists search for specialised nerve endings that transmit mechanical data on joint capsule, tendon and muscle tension (such as Golgi tendon organs and muscle spindles), which play a large role in proprioception. Primary endings of muscle spindles "respond to the size of a muscle length change and its speed" and "contribute both to the sense of limb position and movement". Secondary endings of muscle spindles detect changes in muscle length, and thus supply information regarding only the sense of position. Essentially, muscle spindles are stretch receptors. It has been accepted that cutaneous receptors also contribute directly to proprioception by providing "accurate perceptual information about joint position and movement", and this knowledge is combined with information from the muscle spindles.
===== Pore size ===== In a microporous material where physisorption and weak van der Waals forces dominate adsorption, the storage density is greatly dependent on the size of the pores. Calculations of idealized homogeneous materials, such as graphitic carbons and carbon nanotubes, predict that a microporous material with 7 Å-wide pores will exhibit maximum hydrogen uptake at room temperature. At this width, exactly two layers of hydrogen molecules adsorb on opposing surfaces with no space left in between. 10 Å-wide pores are also of ideal size because at this width, exactly three layers of hydrogen can exist with no space in between. (A hydrogen molecule has a bond length of 0.74 Å with a van der Waals radius of 1.17 Å for each atom; therefore, its effective van der Waals length is 3.08 Å.)
On January 1, 1899, after the United States defeated Spain at the end of the Spanish–American War and claimed Cuba as the Military Government of Cuba, Spaniards and the Spanish military left the islands of Cuba returning to mainland Spain, and any major influence of the Grand Lodge of Spain was taken with them. Both of the American Military Governors of Cuba, John R. Brooke and Leonard Wood, were high-ranking Freemasons, as was the President of the United States, William McKinley. On the same day that the Spanish left, on January 1, individual Lodges across Cuba began meeting again regularly. Padilla Lodge was able to purchase an old industrial warehouse in Havana. A mass immigration of US citizens to Cuba brought with it much closer coordination with the mainland American Lodges, and many of the highest-ranking US military government officials took a stance of cooperation with the Lodges in Cuba in order to completely restructure the Cuban Freemasonic system and purge it of Spanish aristocratic influence. These high-ranking officials included Admiral Schley, General Shafter, General Scott, Colonel Theodore Roosevelt and General George M. Moulton.
Sources: en.wikipedia.org
== Use and effects == In his book PiHKAL (Phenethylamines I Have Known And Loved) and other publications, Alexander Shulgin lists thiobuscaline's dose range as 60 to 120 mg orally and its duration as about 8 hours. Its onset is about 1 hour. The effects of thiobuscaline have been reported to include a "benign and beautiful experience which never quite popped into anything psychedelic", subtle threshold effects, a vague awareness of something, being in a "wonderful place spiritually" but with "some dark edges", it being "pleasant, but certainly not psychedelic", and body discomfort. No clear hallucinogenic effects were described. Thiobuscaline is listed as being 4 times more potent as a psychoactive drug than mescaline. Thiobuscaline produced perpetual threshold psychoactive effects that did not further increase across a wide dose range of 35 to 120 mg orally. Shulgin described it as "always the simple and ephemeral catalyst of euphoria without substance and without body". In addition, he said that it could not easily be classified, for instance as a psychedelic or stimulant. Instead, Shulgin likened thiobuscaline to Ariadne (4C-D), which he noted had been called an "antidepressant". He hypothesized that thiobuscaline might be beneficial for treatment of depression in certain people in the exact same way as Ariadne.
Melting 20 kg (44 lb) of crystallized honey at 40 °C (104 °F) can take up to 24 hours, while 50 kg (110 lb) may take twice as long. These times can be cut nearly in half by heating at 50 °C (122 °F); however, many of the minor substances in honey can be affected greatly by heating, changing the flavor, aroma, or other properties, so heating is usually done at the lowest temperature and for the shortest time possible.
==== Composition ==== During the process of ejaculation, sperm passes through the ejaculatory ducts and mixes with fluids from the seminal vesicles, the prostate, and the bulbourethral glands to form the semen. The seminal vesicles produce a yellowish viscous fluid rich in fructose and other substances that makes up about 70% of human semen. The prostatic secretion, influenced by dihydrotestosterone, is a whitish (sometimes clear), thin fluid containing proteolytic enzymes, citric acid, acid phosphatase and lipids. The bulbourethral glands secrete a clear lubricant into the lumen of the urethra. Sertoli cells, which nurture and support developing spermatocytes, secrete a fluid into seminiferous tubules that helps transport sperm to the genital ducts. The ductuli efferentes possess cuboidal cells with microvilli and lysosomal granules that modify the ductal fluid by reabsorbing some fluid. Once the semen enters the ductus epididymis the principal cells, which contain pinocytotic vessels indicating fluid reabsorption, secrete glycerophosphocholine which most likely inhibits premature capacitation. The accessory genital ducts, the seminal vesicle, prostate glands, and the bulbourethral glands, produce most of the seminal fluid. Seminal plasma of humans contains a complex range of organic and inorganic constituents. The seminal plasma provides a nutritive and protective medium for the spermatozoa during their journey through the female reproductive tract. The normal environment of the vagina is a hostile one (cf.
=== Graph based === Similarly to string-based methods, the molecular graph can directly be used as input for QSAR models, but usually yield inferior performance compared to descriptor-based QSAR models.
=== 3 February === Abdallah Hussein, a senior RSF commander was killed by an SAF airstrike in al-Kamelin in Gezira State. The SAF claimed to have broke the siege of its Corps of Engineers garrison in the Al 'Aylafun area, and retook the al-Asaylat, Um Daw Ban, and Al 'Aylafun areas of the East Nile locality. The SAF said it plans to continue advances to recapture the Soba Bridge. According to the state health minister of South Kordofan, the SPLM-N (al-Hilu) killed 44 people after shelling the main market, residential neighborhoods, and temporary shelters in schools in Kadugli. Twenty-five people were killed in an SAF airstrike in Nyala.
Sources: en.wikipedia.org
== Continued regeneration in adult humans == There are few examples of regeneration in humans continuing after fetal life in to adulthood. Generally, adult wound healing involves fibrotic processes causing wound contraction which may lead to the formation of scar tissue. In regeneration, however, completely new tissue is synthesized. This can lead to scar free healing where the function and structure of the organ is reinstated. However organ regeneration is not yet fully understood. Two types of regeneration in human adults are currently recognised; spontaneous and induced. Spontaneous regeneration occurs naturally at several locations of the human body. One highly recognised example of this is the regeneration of the liver, which can regenerate up to two thirds of its mass when injured by surgical removal, ischaemia, or after exposure to harmful toxins. (Figure 2)
Smitty's Family Restaurants opened their first location in 1960 and now operates 82 restaurants across Canada. Smitty's was one of the first ever franchise model restaurants in the country. Smitty's Restaurants are family owned and operated, and are known for their all day breakfast, lunch and dinner offerings. Their taglines of "All Your Favourites. All Day Long." and "Canada's Family Restaurant" are represented in a vast menu of choices for every age.
Burmese tofu (to hpu in Burmese) is a legume product made from besan (chana dal) flour; the Shan variety uses yellow split pea flour instead. Both types are yellow in color and generally found only in Myanmar, and Yunnan province of China, though the Burman variety is also available in some overseas restaurants serving Burmese cuisine. The term is believed to be derived from Dou Fen (bean Jelly) from Chinese and it was adopted to Burmese cuisine through Shan people (Dai people of Yunnan) . Burmese tofu may be fried as fritters cut into rectangular or triangular shapes. A variety called hsan to hpu (or hsan ta hpo in Shan regions) is made from rice flour (called hsan hmont or mont hmont) and is white in color with the same consistency as yellow Burmese tofu when set. It is eaten as a salad in the same manner as yellow tofu.
=== Selected publications === 2023, The Information Theory of Aging, Nature Aging 2023, Chemically induced reprogramming to reverse cellular aging, Aging 2023, Loss of epigenetic information as a cause of mammalian aging, Cell 2021, The economic value of targeting aging, Nature Aging 2020, Reprogramming to recover youthful epigenetic information and restore vision, Nature 2008, SIRT1 redistribution on chromatin promotes genomic stability but alters gene expression during aging, Cell
Sources: en.wikipedia.org
It corresponds to the first 28 amino acids of thymosin beta-4, a larger protein found in many tissues. The fragment is acetylated at its N-terminus and is produced synthetically for research and pharmaceutical use. Synthetic and natural forms share the same sequence.
It is usually described as an immunomodulatory peptide rather than a classical hormone. It does not travel to a single distant organ in the manner of an endocrine hormone. Classification varies across sources, and some texts group it with thymic peptides generally.
The broad outline involves immune cell activation, but the specific molecular steps remain under investigation. Different studies report effects on dendritic cells, T cells, and natural killer cells. No single receptor has been confirmed as the sole mediator.
It is usually classified as an immunomodulatory peptide rather than a classical hormone. It derives from the larger protein prothymosin alpha and acts mainly on immune cells. The thymosin label covers a group of distinct peptides, so the naming can be misleading.