Everything below concerns lyophilized peptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-12-14. Numbers and descriptions here follow the published literature rather than marketing material.
Several compounds share the GHRH framework, including sermorelin, the shorter 1-29 fragment, and other analogs built on the full 1-44 chain. Naming follows a common convention: a stem that identifies the peptide plus a suffix marking analog status. Reports may describe tesamorelin by its sequence fragment, as a GHRH(1-44) analog, or by its amino-terminal modification. Indexing the compound therefore requires searching all of these forms, since some older literature predates the current international nonproprietary name.
Tesamorelin is a synthetic peptide built from 44 amino acids and classified with the growth hormone–releasing hormone family. Its sequence corresponds to the human GHRH(1-44) backbone, carrying one structural change at the amino terminus. That change is a trans-3-hexenoyl group placed where the natural peptide would have an unmodified end. The modification is the feature that separates the compound from the endogenous hormone in name, in stability, and in how it is handled in the laboratory.
The hexenoyl cap slows the enzyme step that trims the amino terminus of native GHRH, the same step that shortens its active lifetime in circulation. As a result, the modified peptide persists longer in plasma than the unmodified hormone in side-by-side comparison. Receptor activity stays broadly comparable, because the added group sits away from the residues that contact the binding site. This combination, preserved receptor activity with reduced degradation, explains why the analog was developed instead of the native sequence.
Regulatory approval in the United States came in 2010, when the Food and Drug Administration cleared the peptide for the reduction of excess abdominal fat in adults with HIV infection and associated lipodystrophy. The decision rested mainly on two randomized phase 3 trials that enrolled roughly eight hundred patients and ran for twenty-six weeks. Participants receiving active drug showed substantially greater declines in visceral adipose tissue than those receiving placebo, while total body weight changed comparatively little. A reformulated presentation was later approved, and the product has remained a niche therapy rather than a general weight-loss agent.
Tesamorelin occupies a narrow position among agents that act on the growth hormone axis. Unlike growth hormone itself, which is given as replacement, it stimulates the pituitary to release the hormone in pulses, so the downstream increase in insulin-like growth factor 1 depends on intact somatotroph function. Other peptides in the same family include shorter GHRH fragments and synthetic secretagogues with different stability profiles. Several points remain unresolved, including whether the reduction in visceral fat translates into fewer cardiovascular events, what happens to metabolic markers after long-term use, and how the drug compares with lifestyle or surgical approaches.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic peptide | GHRH analog family |
| Residue count | 44 amino acids | Matches human GHRH(1-44) backbone |
| N-terminal group | trans-3-hexenoyl | Main structural difference from native hormone |
| Appearance | White to off-white powder | Lyophilized solid form |
| Solubility class | Freely soluble in water | Peptide character; less soluble in organic solvents |
For instance, Captopril® (Enalapril), Integrilin® (Eptifibatide) and Aggrastat® (Tirofiban) are drugs based on snake venoms, which have been approved by the FDA. In addition to these approved drugs, many other snake venom components are now involved in preclinical or clinical trials for a variety of therapeutic applications.
ligation The joining of consecutive nucleotides in the same strand of a nucleic acid molecule via the formation of a phosphodiester bond between the 5'-phosphoryl terminus of one nucleotide and the 3'-hydroxyl terminus of an adjacent nucleotide, a condensation reaction catalyzed by enzymes known as ligases. This reaction occurs in fundamentally the same way in all varieties of DNA and RNA anabolism, natural or artificial, whether the addition of individual nucleotides to a growing strand (as in DNA replication and transcription), or the repair of nicks and cuts in previously intact molecules, or the joining of separate nucleic acid fragments into a single molecule (as in chromosomal crossover, exon splicing, retroviral transposition, and all other forms of genetic recombination, as well as artificial molecular cloning techniques). Ligation is the opposite of the catabolic reaction wherein phosphodiester bonds are cleaved by nucleases. It also should not be confused with the non-covalent base pairing that can occur between complementary strands; ligation refers specifically to the synthesis of the phosphate backbone of a single strand.
Kissinger tried to persuade Thọ that he had nothing to fear from the United States in the long term, and asked: "when we can live with governments that are not pro-American in the largest Asian nations, why should we insist on a government that is pro-American in Saigon?" Tho charged that Kissinger was bringing nothing new.
The sample is collected by drawing blood into a tube containing an anticoagulant—typically EDTA—to stop its natural clotting. The blood is usually taken from a vein, but when this is difficult it may be collected from capillaries by a fingerstick, or by a heelprick in babies. Testing is typically performed on an automated analyzer, but manual techniques such as a blood smear examination or manual hematocrit test can be used to investigate abnormal results. Cell counts and hemoglobin measurements are performed manually in laboratories lacking access to automated instruments.
Sources: en.wikipedia.org
Cardiac muscle cells are the contracting cells that allow the heart to pump. Each cardiomyocyte needs to contract in coordination with its neighboring cells - known as a functional syncytium - working to efficiently pump blood from the heart, and if this coordination breaks down then – despite individual cells contracting – the heart may not pump at all, such as may occur during abnormal heart rhythms such as ventricular fibrillation. Viewed through a microscope, cardiac muscle cells are roughly rectangular, measuring 100–150μm by 30–40μm. Individual cardiac muscle cells are joined at their ends by intercalated discs to form long fibers. Each cell contains myofibrils, specialized protein contractile fibers of actin and myosin that slide past each other. These are organized into sarcomeres, the fundamental contractile units of muscle cells. The regular organization of myofibrils into sarcomeres gives cardiac muscle cells a striped or striated appearance when looked at through a microscope, similar to skeletal muscle. These striations are caused by lighter I bands composed mainly of actin, and darker A bands composed mainly of myosin. Cardiomyocytes contain T-tubules, pouches of cell membrane that run from the cell surface to the cell's interior which help to improve the efficiency of contraction. The majority of these cells contain only one nucleus (some may have two central nuclei), unlike skeletal muscle cells which contain many nuclei.
== Causes == Mutations in the COL11A1, COL11A2, and COL2A1 genes cause collagenopathy, types II and XI. These genes carry instructions for the protein strands that make up type II and type XI collagen. All collagen molecules are made of three protein strands (called alpha chains). The alpha chains may be identical or different, depending on the type of collagen. Type II collagen is made by combining three copies of the alpha chain made by the COL2A1 gene. Type XI collagen, on the other hand, is composed of three different alpha chains: the products of the COL2A1, COL11A1, and COL11A2 genes. Mutations in these genes interfere with the proper assembly of type II and XI collagens or reduce the amount of these collagens. Defective or reduced numbers of collagen molecules affect the development of bones and other connective tissues, causing the signs and symptoms of the type II and XI collagenopathies.
Technetium and promethium are unusual light elements in that they have no stable isotopes. Using the liquid drop model for atomic nuclei, one can derive a semiempirical formula for the binding energy of a nucleus. This formula predicts a "valley of beta stability" along which nuclides do not undergo beta decay. Nuclides that lie "up the walls" of the valley tend to beta decay towards the center (by emitting an electron, emitting a positron, or capturing an electron). For a fixed number of nucleons A, the binding energies lie on one or more parabolas, with the most stable nuclide at the bottom. One can have more than one parabola because isotopes with an even number of protons and an even number of neutrons are more stable than isotopes with an odd number of neutrons and an odd number of protons. A single beta decay then transforms one into the other. When there is only one parabola, there can be only one stable isotope lying on that parabola. When there are two parabolas, that is, when the number of nucleons is even, it can happen (rarely) that there is a stable nucleus with an odd number of neutrons and an odd number of protons (although this happens only in five instances: 2H, 6Li, 10B, 14N and 180mTa). However, if this happens, there can be no stable isotope with an even number of neutrons and an even number of protons (180 is an exception, and 180mTa is only observationally stable). For technetium (Z = 43), the valley of beta stability is centered at around 98 nucleons.
Biologics can refer to a wide range of biological products in medicine. However, in most cases, the term is used more restrictively for a class of therapeutics (either approved or in development) that are produced using biological processes involving recombinant DNA technology. These medications are usually one of three types:
==== Miscellaneous euarchontoglires research ==== Zhang & Wang (2026) revise and study the affinities of fossil lagomorphs from China. A study on the anatomy and affinities of Gymnesicolagus gelaberti is published by Čermák et al. (2026). Zhang & Wang (2026) describe new fossil material of Desmatolagus gobiensis from the Oligocene strata from the Ulantatal site (Inner Mongolia, China) and study the phylogenetic relationships of the species, interpreting it as a basal member of Ochotonidae. Kalaitzi & Kostopoulos (2026) study the forelimb and hindlimb morphology of Trischizolagus dumitrescuae, interpreted as indicative of adaptations for controlled, agile leaping, as well as indicative of more developed running abilities compared to typical rabbits but without the extreme specialization seen in hares. Chester et al. (2026) report the discovery of fossil material of Purgatorius from the Denver Formation (Colorado, United States), representing the first record of a Puercan plesiadapiform south of Montana reported to date. Evidence from the study of virtual endocasts of extant and extinct members of Euarchontoglires, indicative of a shared ancestral endocranial shape in early members of the group, indicating that treeshrews are not a good model for the ancestral endocranial shape in Euarchontoglires, and indicating that primates evolved their modern endocranial morphologies faster than other members of Euarchontoglires, is presented by Lang et al. (2026)
Sources: en.wikipedia.org
Cauliflower ear is an irreversible condition that occurs when the external portion of the ear is hit and develops a blood clot or other collection of fluid under the perichondrium. This separates the cartilage from the overlying perichondrium that supplies its nutrients, causing it to die and resulting in the formation of fibrous tissue in the overlying skin. As a result, the outer ear becomes permanently swollen and deformed, resembling a cauliflower, hence the name. The condition is common in sport wrestling, professional wrestling, boxing, and kickboxing, in martial arts such as Brazilian jiu-jitsu, judo, sumo, and mixed martial arts, and in full-contact sports such as rugby union and rugby league.
== Research == There is no cure for any type of muscular dystrophy group. Several drugs designed to address the root cause are under development, including gene therapy (Microdystrophin), and antisense drugs (Ataluren, Eteplirsen etc.). Other medications used include corticosteroids (Deflazacort), calcium channel blockers (Diltiazem) to slow skeletal and cardiac muscle degeneration, anticonvulsants to control seizures and some muscle activity, and immunosuppressants (Vamorolone) to delay damage to dying muscle cells. Physical therapy, braces, and corrective surgery may help with some symptoms while assisted ventilation may be required in those with weakness of breathing muscles. Outcomes depend on the specific type of disorder.
Pasteur's research led to Ignaz Semmelweis and Joseph Lister researching the importance of sanitized hands in medical work. In the 1840s, Semmelweis' observations and ideas surrounding sanitary techniques were rejected and his book on the topic condemned by the medical community due to its conflict with the prevailing theory and practice of humorism at the time. After Lister's publications, which supported hand washing and sanitation with germ theory, doctors started sanitizing their hands in the 1870s; mandatory handwashing was not incorporated into common health practice until as late as the 1980s. The discovery of the connection of microorganisms to disease came later in the nineteenth century, when Italian anatomist Filippo Pacini isolated the cholera bacterium Vibrio cholerae in 1854 in Florence during the Asiatic Cholera Pandemic of 1846–63 and clearly linked the presence of the bacterium in the intestinal mucosa of dead cholera patients to the disease. Although Pacini's work was available to the international scientific community via French and English translations, the discovery of the cholera-causing agent is often attributed to the German physician Robert Koch who rediscovered it in 1884. Koch is credited for introducing the science of microorganisms including bacteria to the medical field. Koch, a pioneer in medical microbiology, worked on cholera, anthrax and tuberculosis. In his research into tuberculosis Koch finally proved the germ theory, for which he received a Nobel Prize in 1905.
Regeneration is driven by actively dividing fungal and algal cells within mature thallus areas, allowing new growth from virtually any part of the lichen body, including apothecial disk margins. This adaptation is particularly evident in X. parietina and some Teloschistales species, providing a significant ecological advantage over lichens that lack both vegetative propagules and high regenerative ability. This fragmentation-based dispersal contributes to the species' resilience and widespread distribution.
Sources: en.wikipedia.org
No. It is a peptide that acts upstream of growth hormone release, while growth hormone is the hormone itself. The two differ in size, in receptor, and in how the body clears them.
It blocks the amino-terminal degradation step that limits native GHRH. The addition extends how long the peptide survives in plasma without removing its ability to activate the receptor.
The chain contains 44 amino acid residues. It matches the human GHRH(1-44) sequence apart from the amino-terminal modification.
It is a laboratory-made peptide of forty-four amino acids whose sequence matches human growth hormone-releasing hormone, with a modified amino terminus. The modification is a short unsaturated fatty acid chain attached to the first residue. This change slows enzymatic breakdown and lengthens the time the peptide stays active in circulation.