The short version of actin-binding motif fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
Several names appear in scientific and commercial contexts for this peptide. The label TB-500 is informal and does not follow standard biochemical nomenclature. Research articles more often describe the compound as a thymosin beta-4 fragment, Tβ4 fragment, or by its sequence Ac-LKKTETQ. Confusing TB-500 with full-length thymosin beta-4 can lead to incorrect assumptions about activity because the fragment lacks the remaining residues of the parent protein. The relationship between fragment and parent protein remains an active area of study.
Regulatory status differs by country, but TB-500 is not an approved pharmaceutical in major jurisdictions. It is commonly sold as a research chemical for laboratory use, which places responsibility for identity and purity on the supplier and the laboratory. Published human data are limited, and most reports involve preclinical models or cell culture. Questions about whether the fragment mimics all actions of thymosin beta-4, and under which conditions, remain open. Independent verification of any material is therefore a practical requirement in research settings.
Material sold under this label typically arrives as a freeze-dried powder in a sealed vial with a certificate of analysis. Such certificates usually report reversed-phase chromatography purity plus a mass confirmation, and stated purities commonly sit between 95 and 99 percent. Counter-ion identity, residual trifluoroacetate, water content, and peptide net weight are separate specifications that a certificate may or may not include. A purity figure alone does not establish sequence identity, so independent mass verification remains the practical check.
The designation TB-500 circulates in laboratory and catalog contexts without a single agreed definition. Most product listings apply it to an N-terminally acetylated seven-residue fragment of thymosin beta-4, while other listings attach the same label to the full 43-residue protein. Because the term is commercial rather than systematic, two entries bearing identical names may describe different molecules. Any documentation should therefore state which sequence a given sample is claimed to contain.
The fragment most often associated with the name carries the sequence Ac-LKKTETQ, matching residues 17 through 23 of thymosin beta-4. That region holds the actin-binding motif responsible for much of the parent protein's biochemical activity. Apart from N-terminal acetylation the peptide is unmodified and contains no disulfide bonds, so it shows little ordered secondary structure in solution. Full-length thymosin beta-4 is instead a 43-residue polypeptide of roughly 4.9 kDa found widely across mammalian cell types.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C38H68N10O14 | Calculated for the acetylated heptapeptide |
| Molecular weight | ~889 Da | Monoisotopic mass approximately 889.0 Da |
| Amino acid sequence | Ac-LKKTETQ | N-terminal acetylated seven-residue peptide |
| Appearance | White to off-white powder | Typically supplied as a lyophilized solid |
| Solubility class | Water-soluble | Peptides of this size generally dissolve in aqueous media |
Interest in the peptide grew during the 2000s and 2010s, when studies of tendon and ligament injuries in horses reported changes in lesion size after treatment. Those reports circulated widely outside the scientific literature and shaped much of the current online discussion. Subsequent reviews noted inconsistent study design, small groups, and a shortage of independent replication. Popular descriptions often blur the line between the fragment, the complete protein, and unrelated growth factors, which complicates comparisons across sources.
TB-500 is a synthetic peptide whose sequence corresponds to a short fragment near the N-terminus of thymosin beta-4, a small protein present in most mammalian cells. The fragment is commonly cited as containing the actin-binding region of the parent molecule, which is why it appears in laboratory work on cell migration and tissue repair. Suppliers distribute it as a lyophilised powder intended for research use. Its identity is defined by amino acid sequence and by the presence of an acetyl group on the N-terminal residue.
Identity and purity checks for peptide material typically combine reversed-phase high-performance liquid chromatography with mass measurement, since retention time alone cannot confirm a sequence. Mass measurement verifies the expected molecular mass within instrument tolerance, while chromatographic peak area provides a purity estimate. Anti-doping analysis of urine uses related but more sensitive workflows, sometimes after solid-phase extraction. For research material, batch documentation, certificate content, and independent testing are common points of scrutiny, because supply chains outside pharmaceutical regulation vary widely in the paperwork they provide.
Reconstitution of a lyophilized peptide is normally done with sterile water or a suitable buffer under aseptic conditions. Adding solvent down the vial wall and allowing gentle dissolution instead of vigorous vortexing reduces the chance of aggregation, which can lower the effective concentration of the resulting solution. Concentrated stocks are usually diluted into working buffer shortly before use. Because no standard preparation protocol exists for TB-500 specifically, laboratories adapt general peptide handling practice, and reported results may reflect differing preparation choices.
Dry peptide powder is commonly kept at −20 °C in a desiccated container away from light, a practice that limits moisture uptake and oxidation. Once dissolved, solutions are generally held at 2–8 °C for short periods or frozen at −20 °C or lower for longer storage, with repeated freeze-thaw cycles avoided. Hydrolysis and oxidation are the main degradation routes for peptides in solution, and both accelerate at higher temperature or extreme pH. Published stability data specific to TB-500 are limited, so shelf life should be treated as uncertain.
=== Antifouling material for industry === Some algicidal bacterial species produce bioactive compounds that have potential applications in antifouling coatings for ship hulls and aquaculture facilities. These compounds can inhibit the growth and attachment of algae and other microorganisms on submerged surfaces, reducing biofouling. They are still under investigation and can potentially be an environmentally friendly alternative to the traditional chemical anti-fouling paints.
==== French Polynesia ==== In French Polynesia, glass noodles are known as vermicelle de soja and were introduced to the islands by Hakka agricultural workers during the 19th century. They are most often used in maʻa tinito, a dish made with glass noodles mixed together with pork, beans, and cooked vegetables.
The fingers may develop almost any deformity depending on which joints are most involved. Specific deformities, which also occur in osteoarthritis, include ulnar deviation, boutonniere deformity (also "buttonhole deformity", flexion of proximal interphalangeal joint and extension of distal interphalangeal joint of the hand), swan neck deformity (hyperextension at proximal interphalangeal joint and flexion at distal interphalangeal joint) and "Z-thumb". "Z-thumb" or "Z-deformity" consists of hyperextension of the interphalangeal joint, fixed flexion, and subluxation of the metacarpophalangeal joint and gives a "Z" appearance to the thumb. The hammer toe deformity may be seen. In the worst case, joints are known as arthritis mutilans due to the mutilating nature of the deformities.
=== Fertilizers === Melamine was once envisioned as fertilizer for crops during the 1950s and 1960s because of its high (66% by mass) nitrogen content. However, melamine is much more expensive to produce than other common nitrogen fertilizers, such as urea. The mineralization (degradation to ammonia) for melamine is slow, making this product both economically and scientifically impractical for use as a fertilizer.
== Early life and education == Robert S. Swanson was born in Brooklyn, New York, in 1947 to Arthur J. Swanson and Arline Baker Swanson. Arthur Swanson was an airplane electrical maintenance crew leader, and worked in shifts. According to Swanson, he was taught from an early age that his generation would do better than the last generation of his family. It was because of this that his family wanted him to be the first to obtain a college degree. His family was particularly interested in the Massachusetts Institute of Technology (MIT). Much to his family's pride, Swanson was accepted into MIT in 1965. Even though he was majoring in chemistry, he realized later during his undergraduate education that he preferred working with people, rather than in research. What follows is an excerpt from a 1996 interview that describes how he came to this realization: "At the end of my junior year, I... got a summer job working for a chemical company... One of the things I discovered was that I enjoyed people more than things. So I said, 'Gee, this probably isn't going to be what I'd want to do all my life,'". As a result, Swanson petitioned MIT to be able to take the first year's courses at the Alfred P. Sloan School of Management for a master's degree, and they allowed him to do so. Thanks to the graduate courses he took, he realized that he was particularly interested in two things: organizational development, and the commercialization of innovative ideas. He graduated from MIT in 1970, with an undergraduate degree in chemistry and a Master of Science degree in management.
Sources: en.wikipedia.org
On March 23 2023, Brazilian police raided the Salgueiro favela in São Gonçalo, Rio de Janeiro, killing Leonardo Costa Araujo, the head of CV in Para, and other 12 gangsters. On September 4 2025, eight members of the Terceiro Comando Puro were killed in a shootout with police in Rio de Janeiro. Later, on October 28, 2025, against the backdrop of COP30, Brazilian police launched Operation Containment on Comando Vermelho spots in Rio de Janeiro, arresting at least 81 suspected gang members while resulting in the deaths of more than 132 people, including four police officers and at least 17 residents without prior criminal records. On 14 January 2026, four people were killed in a police operation against the Comando Vermelho in the Salgueiro favela of Rio de Janeiro. On 18 March, eight people, including Comando Vermelho commander Claudio Augusto dos Santos, were killed in police raids across Rio de Janeiro.
=== 2000 census === As of the 2000 United States census there were 7,746 people, 2,630 households, and 2,161 families residing in the borough. The population density was 3,625.9 inhabitants per square mile (1,400.0/km2). There were 2,702 housing units at an average density of 1,264.8 per square mile (488.3/km2). The racial makeup of the borough was 78.05% White, 0.92% African American, 0.04% Native American, 18.64% Asian, 0.65% from other races, and 1.70% from two or more races. Hispanic or Latino of any race were 3.99% of the population. There were 2,630 households, out of which 40.6% had children under the age of 18 living with them, 71.1% were married couples living together, 8.5% had a female householder with no husband present, and 17.8% were non-families. 15.9% of all households were made up of individuals, and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.91 and the average family size was 3.26. In the borough the age distribution of the population shows 26.3% under the age of 18, 4.7% from 18 to 24, 26.4% from 25 to 44, 25.7% from 45 to 64, and 16.9% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 92.7 males. For every 100 females age 18 and over, there were 88.2 males. The median income for a household in the borough was $84,692, and the median income for a family was $96,245. Males had a median income of $61,194 versus $38,990 for females. The per capita income for the borough was $41,573.
==== Thermoregulation ==== Hair length is not a factor in thermoregulation: for example, some tropical mammals such as sloths have the same length of fur length as some arctic mammals but with less insulation; and, conversely, other tropical mammals with short hair have the same insulating value as arctic mammals. The denseness of fur can increase an animal's insulation value, and arctic mammals especially have dense fur; for example, the musk ox has guard hairs measuring 30 cm (12 in) as well as a dense underfur, which forms an airtight coat, allowing them to survive in temperatures of −40 °C (−40 °F). Some desert mammals, such as camels, use dense fur to prevent solar heat from reaching their skin, allowing the animal to stay cool; a camel's fur may reach 70 °C (158 °F) in the summer, but the skin stays at 40 °C (104 °F). Aquatic mammals, conversely, trap air in their fur to conserve heat by keeping the skin dry.
Barker countersued for slander, but Hallstrom prevailed, receiving a settlement in 2005. Though she was not required to sign a non-disclosure agreement, she limited her comments about Barker until after his death, fearing retribution from him. In October 2007, Deborah Curling, a CBS employee assigned to The Price Is Right, filed a lawsuit against CBS, Bob Barker, and The Price Is Right producers, claiming that she was forced to quit her job after testifying against Barker in a wrongful-termination lawsuit brought by a previous show producer. Curling claimed that she was demoted to an "intolerable work environment" backstage, which caused her to leave the job. Curling, who is black, also alleged that the show's producers, including Barker, created a hostile work environment in which black employees and contestants were discriminated against. A few months later, Barker was removed from the lawsuit, and in September 2009, the lawsuit was dismissed. Curling's attorney stated that he planned to appeal the dismissal of the lawsuit. In January 2012, the California Court of Appeals affirmed the dismissal.
Thus, instead of letting the wave propagate through the fuel, the fuel itself is moved through a largely stationary burn wave. This is contrary to many media reports, which have popularized the concept as a candle-like reactor with a burn region that moves down a stick of fuel. By replacing a static core configuration with an actively managed "standing wave" or "soliton" core, TerraPower's design avoids the problem of cooling a highly variable burn region. Under this scenario, the reconfiguration of fuel rods is accomplished remotely by robotic devices; the containment vessel remains closed during the procedure, and there is no associated downtime. In a separate fast-reactor project, the NRC approved a construction permit for TerraPower's Natrium project at Kemmerer, Wyoming, in March 2026. The sodium-cooled fast reactor still required a separate operating licence before it could operate.
Sources: en.wikipedia.org
The standard bait distribution density is 75 baits/km2 in rural areas and 150 baits/km2 in urban and developed areas. ORV programs were initiated in Europe in the 1980s, Canada in 1985, and in the United States in 1990. ORV is a preventive measure to eliminate rabies in wild animal vectors of disease, mainly foxes, raccoons, raccoon dogs, coyotes and jackals, but also can be used for dogs in developing countries. Implementation of ORV programs in the United States has led to the elimination of the coyote rabies virus variant in 2003 and gray fox variant during 2013. Furthermore, ORV has been successful in preventing the westward expansion of the raccoon rabies enzootic front beyond Alabama.
Pharmacists are healthcare professionals with specialized education and training who perform various roles to ensure optimal health outcomes for their patients through the quality use of medicines. Pharmacists may also be small business proprietors, owning the pharmacy in which they practice. Since pharmacists know about the mode of action of a particular drug, and its metabolism and physiological effects on the human body in great detail, they play an important role in optimization of drug treatment for an individual. Pharmacists are represented internationally by the International Pharmaceutical Federation (FIP), an NGO linked with World Health Organization (WHO). They are represented at the national level by professional organisations such as the Royal Pharmaceutical Society in the UK, Pharmaceutical Society of Australia (PSA), Canadian Pharmacists Association (CPhA), Indian Pharmacist Association (IPA), Pakistan Pharmacists Association (PPA), American Pharmacists Association (APhA), and the Malaysian Pharmaceutical Society (MPS). In some cases, the representative body is also the registering body, which is responsible for the regulation and ethics of the profession. In the United States, specializations in pharmacy practice recognized by the Board of Pharmacy Specialties include: cardiovascular, infectious disease, oncology, pharmacotherapy, nuclear, nutrition, and psychiatry. The Commission for Certification in Geriatric Pharmacy certifies pharmacists in geriatric pharmacy practice.
== Salaries == According to the 2022 Medscape Physician Compensation Report, physicians on average earn $339K annually. Primary care physicians earn $260K annually while specialists earned $368K annually. The table below details the average range of salaries for physicians in the US of medical specialties:
== Pharmacological properties == Oripavine possesses an analgesic potency comparable to morphine; however, it is not clinically useful due to severe toxicity and low therapeutic index. In both mice and rats, toxic doses caused tonic-clonic seizures followed by death, similar to thebaine. Oripavine has a potential for dependence which is significantly greater than that of thebaine but slightly less than that of morphine.
Company real estate holdings were estimated at $4 billion in value. Also in 2018, Stonepeak Partners, D1 Capital Partners, and existing backers acquired minority stakes in the company valued at $700 million. On February 25, 2019 The Wall Street Journal reported the company's acquisition of Preferred Freezer Services LLC., its largest competitor, in a deal reportedly worth over $1 billion, expanding Lineage to the world's largest facility network, with 1.3 billion cubic feet of storage in over 200 facilities across the United States, Europe, and Asia. On May 22, 2020 Lineage acquired the distribution assets of one of the largest independent Food Distribution companies in the country for over 100 years, Maines Paper & Food, Inc, based in Conklin, New York. That June, the company acquired Emergent Cold, Australia's largest cold-chain supplier, and New Orleans Cold Storage, with four port facilities in New Orleans, Louisiana, Houston, Texas and Charleston, South Carolina. In July, Lineage acquired Henningsen Cold Storage, based in Portland, Oregon, with 14 cold storage facilities located mainly in Oregon and Washington, raising its employee roster to 16,000. This acquisition raised Lineage's global storage capacity to 50,660,000 m3 (1.789×109 cu ft). On December 1, 2020, Lineage acquired Pago, a warehousing, distribution and transport logistics provider in Poland. In May 2021, Lineage acquired Crystal Creek e-commerce fulfillment logistics operator and its five U.S. warehouses, increasing the company's acquisitions to 72.
Sources: en.wikipedia.org
TB-500 is a synthetic heptapeptide corresponding to a fragment of thymosin beta-4. It is used in laboratory research and is not an approved drug.
No. Thymosin beta-4 is a 43-amino-acid protein, while TB-500 represents only a short N-terminal segment. The two should not be treated as interchangeable in experimental design.
It is often called a thymosin beta-4 fragment, Tβ4 fragment, or Ac-LKKTETQ. The name TB-500 is mainly a commercial or catalog label rather than a formal chemical name.
Usually not, though usage overlaps. The label most often refers to a short acetylated fragment of the parent protein, while thymosin beta-4 itself is the full 43-residue molecule. Because suppliers vary, a sequence statement is needed to settle the question for any particular lot.