Everything below concerns prothymosin alpha. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-12-03. Where a claim depends on a specific study, the study is described rather than over-claimed.
Several names appear in the literature for this peptide, including thymalfasin and the abbreviation T-alpha-1. Naming conventions differ among research articles, regulatory documents, and supplier catalogs, which complicates literature searches. Both synthetic and recombinant production routes yield a peptide with the same 28-residue sequence as the thymic isolate. Because the thymosin label also covers unrelated peptides, sources should be compared by sequence rather than by name alone.
The peptide occurs naturally in thymic tissue and has been detected in serum and other biological fluids. Reported concentrations are low, and reliable measurement generally requires immunoassay or mass spectrometry with an enrichment step. It is released from a larger precursor, prothymosin alpha, by proteolytic cleavage, although the enzymes involved are not fully characterized. Whether circulating levels reflect thymic output specifically remains an open question.
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.
The name itself causes confusion, because several unrelated thymic peptides share the thymosin label. Thymosin beta-4, for example, is a different molecule with different functions. Naming conventions in the literature also mix descriptive research terms with assigned nonproprietary names, so a reader should confirm which entity a given paper addresses. Clarifying that point is usually the first step in interpreting any claim about this peptide.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C129H215N33O55 | Calculated for the acetylated 28-residue peptide |
| Appearance | White to off-white powder | Lyophilized solid recovered from aqueous buffer |
| Solubility | Freely soluble in water | Typically dissolved in water or buffer before use |
| Typical storage | -20 C or below, desiccated | Protect from light and avoid repeated freeze-thaw cycles |
| Identity testing | Reverse-phase HPLC with mass spectrometry | Retention time and measured mass confirm the sequence |
Reverse-phase high-performance liquid chromatography is the standard technique for assessing purity and concentration, because the peptide's hydrophobicity allows clean separation from related impurities. Mass spectrometry confirms molecular identity and detects sequence errors or truncations. Amino acid analysis and peptide mapping supply additional structural confirmation when required. Chromatographic purity values reported on certificates of analysis describe the proportion of the main peak and do not by themselves establish biological activity.
Like most short peptides, thymosin alpha-1 is susceptible to hydrolysis under strongly acidic or basic conditions and to oxidation when exposed to air over long periods. The acetylated amino terminus blocks one common degradation route, which contributes to the molecule's relative robustness in solution. Lyophilized material generally retains potency for extended periods when kept cold and dry. Once reconstituted, aqueous solutions are less stable and are typically used within a defined window rather than held indefinitely at ambient temperature.
Recommended storage for the dry powder is a freezer near minus twenty degrees Celsius, kept desiccated and away from light. Once dissolved, the peptide is less stable and is usually held at two to eight degrees Celsius for short intervals or frozen for longer storage. Stability studies focus on the acetylated terminus and the disulfide linkage because those features define the intact molecule. Common degradation routes include cysteine oxidation, deamidation of asparagine or glutamine side chains, and slow formation of higher-molecular-weight species.
Identity and purity are usually checked by reverse-phase high-performance liquid chromatography, which separates the intact chain from truncated products, together with mass spectrometry for confirmation of the expected mass. Peptide mapping after enzymatic digestion and amino acid analysis add sequence-level evidence. Release testing also covers water content, residual solvents, and counter-ions, all of which influence measured mass and stability. Related-peptide limits are commonly expressed as a percentage of total peak area, with individual unspecified impurities held below a lower threshold.
The lyophilized peptide is a white to off-white powder that dissolves freely in water and in aqueous buffers near neutral pH. Because the molecule carries a net negative charge under physiological conditions, saline and phosphate solutions are the usual vehicles, while strongly acidic media are avoided. Stock solutions are commonly divided into small aliquots so that repeated freezing and thawing can be limited, since cycling may encourage aggregation. Solubility in organic solvents is poor and those solvents are seldom used as primary diluents.
Nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) is a family of transcription factor protein complexes that controls transcription of DNA, cytokine production and cell survival. NF-κB is found in almost all animal cell types and is involved in cellular responses to stressful stimuli like cytokines, free radicals, heavy metals, ultraviolet irradiation, oxidized LDL, and bacterial or viral antigens. NF-κB plays a key role in regulating the immune response to infection. Incorrect regulation of NF-κB has been linked to cancer, inflammatory and autoimmune diseases, septic shock, viral infection, and improper immune development. NF-κB has also been implicated in processes of synaptic plasticity and memory.
=== Industries === Shipbuilding. Ca. 20% of German shipbuilding. The biggest ship yard ThyssenKrupp Marine Systems situated in Kiel and build submarines of 212 and 214 types. In Flensburg FSG yard build ferries. Famous luxury megayachts are built by Lürssen-Kröger Werft, Schacht-Audorf, and Nobiskrug, Rendsburg. Shipyards in Lübeck and Caterpillar-MaK marine engine plant were closed. Raytheon Anschütz deliveries navigation equipment, autopilots, and radars to shipyards.
=== Smoking cessation === Cytisine has been available in post-Soviet states as an aid to smoking cessation under the brand name Tabex from the Bulgarian pharmaceutical company Sopharma AD. In 1961, Bulgarian pharmacist Strashimir Ingilizov synthesized Tabex using the alkaloid Cytisine which was derived from the seeds of the yellow acacia (Cytisus laburnum), a European decorative shrub prevalent in Bulgaria and commonly referred to as "golden rain". It was first marketed in Bulgaria in 1964 and then became widely available in the Soviet Union. In Poland, it is sold under the brand name Desmoxan, and it is also available in Canada under the brand name Cravv. In June 2026, the U.S. Food and Drug Administration issued a complete response letter for Achieve Life Sciences' application to market cytisinicline for smoking cessation, citing deficiencies at a third-party manufacturing facility and unfinished product labeling. Its molecular structure has some similarity to that of nicotine, and it has similar pharmacological effects. Like the smoking cessation aid varenicline, cytisine is a partial agonist of nicotinic acetylcholine receptors (nAChRs). Cytisine has a short half-life of 4.8 hours. As a result, the extract provides smokers with satisfaction similar to smoking a cigarette, alleviating the urge to smoke and reducing the severity of nicotine withdrawal symptoms, while also reducing the reward experience of any cigarettes smoked.
Samberg starred in Sleater-Kinney's "No Cities to Love" video along with other actors such as Fred Armisen, Elliot Page, and Norman Reedus. On May 16, 2016, Samberg and the Lonely Island performed their 2009 hit "I'm on a Boat" with classroom instruments on The Tonight Show Starring Jimmy Fallon, as part of a recurring segment on the show.
embassy vehicles and staff were no longer immune from penalties for traffic violations. American diplomats were asked to show work contracts for all domestic help (cooks, gardeners, drivers and security staff) employed within their households. Indian authorities also conducted an investigation into the American Embassy School. Nancy J. Powell, the U.S. ambassador to India, resigned following the incident, which was widely seen by India "as fallout from the imbroglio." Some commentators suggested that the incident and response could lead to wider damage in U.S.–India relations. Former Finance Minister Yashwant Sinha called for the arrest of same-sex companions of US diplomats, citing the Supreme Court of India's upholding of Section 377 of the Indian Penal Code whereby homosexuality is illegal in India. Former State Department legal advisor John Bellinger questioned whether the decision to arrest and detain Khobragade was "wise policy ... even if technically permissible" under the Vienna Convention on Consular Relations, while Robert D. Blackwill, the former U.S. ambassador to India from 2001 to 2003, said the incident was "stupid." Nevertheless, within a year of the incident, U.S.-India relations were warming again, as U.S. President Obama visited India in January 2015.
Sources: en.wikipedia.org
The signal in the cyst is the same as in the dural bag. The signal for cysts due to traumas is a little stronger at the periphery or nerve root location. The signal is more important for other causes: synovial cysts, dermoïdes or épidermoïdes cysts, teratomes.
==== Style periods ==== A broad classification of styles, formalized by Le Coq and Waldschmidt in 1933, has been generally accepted. The first style is called "Indo-Iranian style I", and cover all the early caves with delicate tone-on-tone paintings, using browns, oranges and greens. The name "Indo-Iranian" broadly denotes the artistic influence from India, combined with elements of Iranian art, that presided over the creation of the first cave paintings at Kizil. The main representative caves of this style are the Cave of the Hippocampi (Cave 118), the Cave of the Painters (Cave 207), the Peacock Cave (Cave 76), the Overpainted Cave (Cave 117), the Cave of the Statues (Cave 77), and the Cave of the Seafarers (Cave 112). The small group of the Treasure Cave (Cave 83, 84) is considered as contemporary, but in a slightly personal style, sometimes called "Special Style" (Sonderstil). The first style is only found in Kizil, except for one cave in nearby Kumtura: the Cave with the cupola. The second style is called "Indo-Iranian style II", and cover most of the other caves of Kizil, which use strongly contrasted colors and strong line strokes, using browns, oranges and greens and especially a vivid lapis-lazuli blue. The name "Indo-Iranian" again broadly denotes the artistic influence from India, combined with important influences from Central Asian and the Iranian world. This style is further divided in three broad periods. Finally, a third Uighur-Chinese style appears in only two caves at Kizil.
Ethane-1,2-dithiol, also known as EDT, is a colorless liquid with the formula C2H4(SH)2. It has a very characteristic odor which is compared by many people to rotten cabbage. It is a common building block in organic synthesis and an excellent ligand for metal ions. Ethane-1,2-dithiol is made commercially by the reaction of 1,2-dichloroethane with aqueous sodium bisulfide. In the laboratory, it can also be prepared by the action of 1,2-dibromoethane on thiourea followed by hydrolysis. 1,2-Ethanedithiol is a weak acid, typical of alkyl thiols. In the presence of base and an alkylating agent, 1,2-ethanedithiol converts to thioethers: HS(CH2)2SH + 2 NR3 + 2 R'I → R'S(CH2)2SR' + 2 [R3NH]I Oxidation of 1,2-ethanedithiol gives a series of oligomers, including the cyclic bis(disulfide). As a 1,2-dithiol, this compound reacts with aldehydes and ketones to give 1,3-dithiolanes, which can be useful intermediates.
Increased rates of immune system disorders and other wide-ranging symptoms, including chronic pain, fatigue and memory loss, have been reported in over one quarter of combat veterans of the 1991 Gulf War. Combustion products from depleted uranium munitions are being considered as one of the potential causes by the Research Advisory Committee on Gulf War Veterans' Illnesses, as DU was used in 30 mm and 25 mm cannon rounds on a large scale for the first time in the Gulf War. Veterans of the conflicts in the Persian Gulf, Bosnia and Kosovo have been found to have up to 14 times the usual level of chromosome abnormalities in their genes. Serum-soluble genotoxic teratogens produce congenital disorders, and in white blood cells causes immune system damage. A 2005 epidemiology review concluded: "In aggregate the human epidemiological evidence is consistent with increased risk of birth defects in offspring of persons exposed to DU." A 2001 study of 15,000 February 1991 U.S. Gulf War combat veterans and 15,000 control veterans found that the Gulf War veterans were 1.8 (fathers) to 2.8 (mothers) times as likely to have children with birth defects. After examination of children's medical records two years later, the birth defect rate increased by more than 20%:
It has hitherto been necessary to postulate some special arbitrary "instability" of the nucleus, but in the following note, it is pointed out that disintegration is a natural consequence of the laws of quantum mechanics without any special hypothesis... Much has been written of the explosive violence with which the α-particle is hurled from its place in the nucleus. But from the process pictured above, one would rather say that the α-particle almost slips away unnoticed. The theory supposes that the alpha particle can be considered an independent particle within a nucleus, that is in constant motion but held within the nucleus by strong interaction. At each collision with the repulsive potential barrier of the electromagnetic force, there is a small non-zero probability that it will tunnel its way out. An alpha particle with a speed of 1.5×107 m/s within a nuclear diameter of approximately 10−14 m will collide with the barrier more than 1021 times per second. However, if the probability of escape at each collision is very small, the half-life of the radioisotope will be very long, since it is the time required for the total probability of escape to reach 50%. As an extreme example, the half-life of the isotope bismuth-209 is 2.01×1019 years. The isotopes in beta-decay stable isobars that are also stable with regards to double beta decay with mass number A = 5, A = 8, 143 ≤ A ≤ 155, 160 ≤ A ≤ 162, and A ≥ 165 are theorized to undergo alpha decay. All other mass numbers (isobars) have exactly one theoretically stable nuclide.
Sources: en.wikipedia.org
It is a 28-amino-acid peptide originally purified from a bovine thymic extract and later produced synthetically. It is studied mainly for its effects on immune cell function.
No. The two peptides share part of a name but differ in length, sequence, and net charge. Literature searches that treat them as one compound return misleading results.
Solid-phase peptide synthesis is the usual route, and recombinant expression has also been described. Both approaches produce material matching the natural sequence.
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.