The short version of pentadecapeptide fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-01-07. Anything still debated is marked as such rather than presented as settled.
The molecule carries 15 residues, a molar mass near 1419.5 g/mol, and the formula C62H98N16O22. Its structure features a proline-rich central region, a pair of adjacent aspartic acid residues, and no cysteine. The absence of cysteine means no disulfide bonds can form, which simplifies refolding and reconstitution. Suppliers usually ship the material as a freeze-dried powder that appears white to off-white. It dissolves readily in water and in saline solutions.
Published storage guidance follows general peptide practice rather than product-specific studies. The dry powder is typically kept at minus 20 degrees Celsius, away from light and moisture. Once reconstituted, solutions are generally refrigerated and used over days to weeks, because the aqueous environment slowly promotes hydrolysis and oxidation. Long-term data on degradation rates or breakdown products are sparse. Stated shelf lives from different producers vary widely, reflecting the absence of a shared reference standard.
BPC-157 is a synthetic peptide built from fifteen amino acid residues. Its sequence comes from a larger protein fragment that researchers isolated from human gastric juice and described as a body protection compound. The fragment contains glycine, glutamic acid, five prolines, lysine, alanine, two aspartic acids, leucine, and valine. The number 157 in the name refers to the position of the stretch within the parent protein. Material used in laboratories is manufactured rather than extracted from stomach fluid.
The sequence contains an unusually high proportion of proline and glycine, which limits regular secondary structure and contributes to solubility in aqueous media. The compound dissolves readily in water and in normal saline. Because it is a peptide, digestive enzymes are expected to break it down if it is swallowed, a consideration that influences the routes of administration used in animal experiments. Detailed conformational data remain limited, and published structural models are largely computational.
BPC 157 is a synthetic peptide built from fifteen amino acids. The letters stand for body protection compound, and the number is a laboratory code rather than a description of any biological feature. Its single-letter sequence is GEPPPGKPADDAGLV, which corresponds to a calculated mass near 1419.5 daltons. The material is produced by solid-phase peptide synthesis and is distributed as a lyophilized powder, not as a purified extract from a natural source.
| Property | Value | Notes |
|---|---|---|
| Molar mass | Approximately 1419.5 g/mol | Calculated from the reported 15-residue sequence |
| Molecular formula | C62H98N16O22 | Based on the same sequence |
| Appearance | White to off-white powder | Typical of a lyophilized preparation |
| Solubility class | Freely soluble in water | Also dissolves in saline solutions |
| Typical storage temperature | Minus 20 degrees Celsius, dry | Refrigeration advised after reconstitution |
Dry powder is generally stored at low temperature, with minus twenty degrees Celsius or colder advised for extended retention. Reconstituted solutions are less stable than the solid form and are normally kept cold and shielded from repeated freeze-thaw cycles. Light exposure is avoided because some peptides degrade under ultraviolet radiation. The exact rate of degradation depends on concentration, pH, and the presence of salts, so a single shelf life does not apply to every preparation. Reported stability figures should be read as indicative of typical handling rather than as universal constants.
Confirmation of identity and purity relies on standard peptide analysis techniques. Reverse-phase high-performance liquid chromatography separates the peptide from related impurities and serves as the most common purity assay. Mass spectrometry, often coupled to that chromatography step, provides an accurate molecular mass that can be matched against the expected value. Amino acid analysis or sequencing can be added for further confirmation. Because short peptides can be produced by different synthetic routes, laboratories usually report both a chromatographic purity percentage and a mass confirmation rather than a single figure.
Within the research literature, the peptide is discussed through several provisional mechanisms, including cytoprotection, modulation of growth factor signaling, and interaction with the nitric oxide system. None of these mechanisms is fully characterized, and no single pathway is universally accepted. Review articles typically note the gap between consistent animal findings and sparse human evidence. The compound is classified as a research chemical rather than an approved pharmaceutical, which shapes how studies are designed, funded, and reported.
BPC-157 is a synthetic pentadecapeptide with the sequence GEPPPGKPADDAGLV, corresponding to a partial fragment of a larger protein detected in human gastric juice. The name derives from the parent protein designation BPC, an abbreviation of body protection compound, with 157 acting as a fraction or batch identifier used by the original investigators. Its molecular weight is approximately 1419 daltons, and the chain contains no unusual residues or disulfide bridges. In the literature it is described as a short, water-soluble fragment rather than a complete natural protein.
Terminology in the literature is not fully standardised. Papers and product listings use BPC-157, BPC 157, and the longer phrase stable gastric pentadecapeptide BPC 157 interchangeably, and synonyms such as bepecin or PL 14736 appear in older or company-linked publications. Purity claims and reported masses can also differ between sources because peptide preparations may include counterions, residual solvents, or bound water. This variability complicates direct comparison of results across studies and makes the exact identity and grade of a given sample worth verifying. Discussions of the compound should therefore specify the source, salt form, and stated purity where those are known.
BPC-157 is a synthetic peptide composed of fifteen amino acid residues, with the sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val. Its name derives from body protection compound, a term used for a protein fraction identified in human gastric juice. Researchers in Zagreb first reported the pentadecapeptide in the early 1990s and described it as a stable fragment of that larger protein. The compound is also catalogued as PL 14736 and, in some commercial contexts, as bepecin. Its molecular formula is C62H98N16O22 and its monoisotopic mass is approximately 1419 daltons.
Proposed mechanisms include interaction with the nitric oxide system, modulation of growth factor signaling, and effects on blood vessel formation. None of these has been established as the primary mode of action, and some proposed pathways rest on indirect measurements. Whether the reported effects depend on a specific receptor has not been determined. Stability in gastric acid, unusual for a peptide of this size, is also reported in animal work, but the reason for it is not firmly established.
Published studies on BPC-157 are dominated by animal models. Commonly used endpoints include healing of surgically induced lesions in the stomach, tendon-to-bone attachment after transection, and recovery from experimentally induced vascular or intestinal damage. Many of these reports come from a small number of research groups, and the peptide is often described as acting across a wide range of tissue types. That breadth is itself a point of discussion, since one molecule influencing many unrelated systems is unusual.
Human data are far more limited than animal data. A small number of clinical reports exist, generally with few participants and without the randomization or blinding expected in later-phase trials. No large, independently replicated human trial has appeared in the indexed peer-reviewed literature. Statements about effects in people therefore rest on extrapolation from animal work rather than on direct evidence, and the strength of that extrapolation remains an open question rather than a settled matter.
Whilst drug resistance typically involves microbes chemically inactivating an antimicrobial drug or a cell mechanically stopping the uptake of a drug, another form of drug resistance can arise from the formation of biofilms. Some bacteria are able to form biofilms by adhering to surfaces on implanted devices such as catheters and prostheses and creating an extracellular matrix for other cells to adhere to. This provides them with a stable environment from which the bacteria can disperse and infect other parts of the host. Additionally, the extracellular matrix and dense outer layer of bacterial cells can protect the inner bacteria cells from antimicrobial drugs. Phage therapy is a technique that was discovered before antibiotics, but fell to the wayside as antibiotics became predominate. It is now being considered as a potential solution to increasing antimicrobial resistance. Bacteriophages, viruses that only infect bacteria, can specifically target the bacteria of interest and inject their genome. This process makes the bacteria halt its own production to make more phages, and this continues until the bacteria lyses itself and releases the phages into the surrounding environment. Phage therapy does not kill microbiota since it is specific, and it can help those with antibiotic allergies. Some drawbacks are that it is a time-intensive process since the specific bacterium needs to be identified. It also does not currently have the body of research supporting its effects and safety that antibiotics do.
== Industrial applications == Although the use of protecting groups is not preferred in industrial syntheses, they are still used in industrial contexts, e.g. sucralose (sweetener) or the Roche synthesis of oseltamivir (Tamiflu, an antiviral drug) An important example of industrial applications of protecting group theory is the synthesis of ascorbic acid (Vitamin C) à la Reichstein.
== Interactions == Mianserin may enhance the sedative effects of drugs such as alcohol, anxiolytics, hypnotics, or antipsychotics when co-administered. It may decrease the efficacy of antiepileptic medications. Carbamazepine and phenobarbital will cause the body to metabolize mianserin faster and may reduce its effects. There is a risk of dangerously low blood pressure if people take mianserin along with diazoxide, hydralazine, or nitroprusside. Mianserin can make antihistamines and antimuscarinics have stronger effects. Mianserin should not be taken with apraclonidine, brimonidine, sibutramine, or the combination drug of artemether with lumefantrine.
=== Legal status === On 17 September 2020, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) adopted a positive opinion, recommending the granting of a marketing authorization for melphalan. The applicant for this medicinal product is Adienne S.r.l. S.U. Melphalan was approved for medical use in the European Union in November 2020.
=== Cellular role === Hydrogen peroxide is a harmful byproduct of many normal metabolic processes; to prevent damage to cells and tissues, it must be quickly converted into other, less dangerous substances. To this end, catalase is frequently used by cells to rapidly catalyze the decomposition of hydrogen peroxide into less-reactive gaseous oxygen and water molecules. Mice genetically engineered to lack catalase are initially phenotypically normal. However, catalase deficiency in mice may increase the likelihood of developing obesity, fatty liver, and type 2 diabetes. Some humans have very low levels of catalase (acatalasia), yet show few ill effects. The increased oxidative stress that occurs with aging in mice is alleviated by over-expression of catalase. Over-expressing mice do not exhibit the age-associated loss of spermatozoa, testicular germ and Sertoli cells seen in wild-type mice. Oxidative stress in wild-type mice ordinarily induces oxidative DNA damage (measured as 8-oxodG) in sperm with aging, but these damages are significantly reduced in aged catalase over-expressing mice. Furthermore, these over-expressing mice show no decrease in age-dependent number of pups per litter. Overexpression of catalase targeted to mitochondria extends the lifespan of mice. In eukaryotes, catalase is usually located in a cellular organelle called the peroxisome. Peroxisomes in plant cells are involved in photorespiration (the use of oxygen and production of carbon dioxide) and symbiotic nitrogen fixation (the breaking apart of diatomic nitrogen (N2) to reactive nitrogen atoms).
Sources: en.wikipedia.org
In the 19th and 20th centuries, new techniques were developed for the study of plants, including methods of optical microscopy and live cell imaging, electron microscopy, analysis of chromosome number, plant chemistry and the structure and function of enzymes and other proteins. In the last two decades of the 20th century, botanists exploited the techniques of molecular genetic analysis, including genomics and proteomics and DNA sequences to classify plants more accurately. Modern botany is a broad subject with contributions and insights from most other areas of science and technology. Research topics include the study of plant structure, growth and differentiation, reproduction, biochemistry and primary metabolism, chemical products, development, diseases, evolutionary relationships, systematics, and plant taxonomy. Dominant themes in 21st-century plant science are molecular genetics and epigenetics, which study the mechanisms and control of gene expression during differentiation of plant cells and tissues. Botanical research has diverse applications in providing staple foods, materials such as timber, oil, rubber, fibre and drugs, in modern horticulture, agriculture and forestry, plant propagation, breeding and genetic modification, in the synthesis of chemicals and raw materials for construction and energy production, in environmental management, and the maintenance of biodiversity.
== Personal life == On 17 October 2009 McVeigh married his longtime girlfriend, Leanne Tucker. They have a daughter, Ariana, born in March 2011. Mark also had a niece, Luella (the daughter of Sydney's Jarrad McVeigh), born on 25 July 2011 but she died from heart complications barely a month later. Following Essendon's seven-point victory over Port Adelaide, its first over the side since 2004, Mark 'blew a kiss towards to the heavens' in her memory. Essendon's players wore black armbands in the match.
== Adverse effects == In clinical trials, the most common adverse effects of sildenafil use included headache, flushing, indigestion, nasal congestion, and impaired vision, including photophobia and blurred vision. Some sildenafil users have complained of seeing everything tinted blue (cyanopsia). This cyanopsia can be explained because sildenafil, while selective for PDE5, does have some affinity for PDE6, which is the phosphodiesterase found in the retina. Patients thus taking the drug may experience colorvision abnormalities. Some complained of blurriness and loss of peripheral vision. In July 2005, the US Food and Drug Administration (FDA) updated labeling for tadalafil (Cialis), vardenafil (Levitra), and sildenafil (Viagra) to reflect a small number of post-marketing reports of sudden vision loss, while acknowledging that "...it is not possible to determine whether these oral medicines for erectile dysfunction were the cause of the loss of eyesight or whether the problem is related to other factors such as high blood pressure or diabetes, or to a combination of these problems." A careful review of pooled data from clinical trials containing well documented information about the dose and duration of exposure to the drug for a large number of patients, yields no evidence for an increased risk of non-arteritic anterior ischemic optic neuropathy or other adverse ocular events associated with PDE5 inhibitor use.
An improvement on the loose-coupled train is the "Instanter" coupling, in which the middle link of a three-link chain is specially triangular shaped, so that when lying "prone" it provides enough slack to make coupling possible, but when the middle link is rotated 90 degrees, the length of the chain is effectively shortened, reducing the amount of slack without the need to wind a screw. The closeness of the coupling allows the use of inter-vehicle pipes for train brakes. Three-link and Instanter couplings can be operated entirely from the side of the wagons, using a shunter's pole, which has a hook on the end, and is safer when shunting is being done. Similarly, the screw-adjustable coupler can be connected by a shunter's pole once it has been unscrewed. Ordinary three-link couplings have been superseded by instanter, screw or buck-eye couplers in UK freight trains today.
Sources: en.wikipedia.org
In some countries, the black soldier fly, Hermetia illucens, is used to process food industry by-products and food waste. Hermetia illucens is a facultative necrophage and can grow on a wide range of decomposing organic substrates including those of animal origin (e.g. abattoir waste), plant origin (e.g. almond hulls), and a mix of both (e.g. meat, fish and vegetable food waste). Fly larvae are grown on this organic waste and then used as livestock feed or fish feed. The frass generated by the larvae can be used as soil fertilizer too. This waste conversion process, known as bioconversion, has several advantages. It reduces the greenhouse gas emissions caused by microbial decomposition of food waste in landfills (e.g. methane), it generates high-quality protein for feeding livestock, and it generates low-cost fertilizer for crop cultivation.
==== Chlorophylls ==== Chlorophyll a is found in all chloroplasts, as well as their cyanobacterial ancestors. Chlorophyll a is a blue-green pigment partially responsible for giving most cyanobacteria and chloroplasts their color. Other forms of chlorophyll exist, such as the accessory pigments chlorophyll b, chlorophyll c, chlorophyll d, and chlorophyll f. Chlorophyll b is an olive green pigment found only in the chloroplasts of plants, green algae, any secondary chloroplasts obtained through the secondary endosymbiosis of a green alga, and a few cyanobacteria. It is the chlorophylls a and b together that make most plant and green algal chloroplasts green. Chlorophyll c is mainly found in secondary endosymbiotic chloroplasts that originated from a red alga, although it is not found in chloroplasts of red algae themselves. Chlorophyll c is also found in some green algae and cyanobacteria. Chlorophylls d and f are pigments found only in some cyanobacteria.
The Supreme Court then ruled to remove the words "by blood" from its constitution and other legal doctrines because "[t]he words, added to the constitution in 2007, have been used to exclude Black people whose ancestors were enslaved by the tribe from obtaining full Cherokee Nation citizenship rights." However, all citizenship is still based on finding an ancestor tied to the Dawes Rolls, which is not without its own controversy apart from blood quantum. Some people of descent are still excluded, like the author Shonda Buchanan who states in her memoir Black Indian that she has ancestors on Cherokee Rolls that were not the Dawes, so would thus still not be recognized. The changes to the Cherokee Nation constitution are still being challenged after the change, most recently by Robin Mayes who appealed for a new election. On September 13, 2021, Marilyn Vann became the first Cherokee Freedmen descendant to be confirmed to a Cherokee government commission when she was appointed to the Environmental Protection Commission by Principal Chief Chuck Hoskin Jr.
There are naturalised non-native occurrences in Ireland (where self-sown saplings typically grow 2.5 m per year when young), Spain and Portugal, and other parts of southern Europe including Cyprus and Macaronesia, and in southern Africa, New Zealand, and the western United States (California, Hawaii).
In analogy to other aziridines, N-methylaziridine can be obtained by a Wenker synthesis from N-methylaminoethanol. This is done either via the sulfuric acid ester or after replacement of the hydroxy group by a chlorine atom (for example by thionyl chloride or chlorosulfuric acid) to N-methyl-2-chloroethylamine and then by using a strong base (cleavage of HCl) in an intramolecular nucleophilic substitution:
Sources: en.wikipedia.org
It does not occur in the form that is supplied commercially. Its sequence matches a fragment of a larger gastric protein, and the research material is produced synthetically in a laboratory. The fragment described in the early literature is generally the same synthetic pentadecapeptide.
It marks the position of the sequence inside the original protein. The label traces back to early work fractionating gastric juice and describing a body protection compound. The figure does not refer to molecular weight or to the count of amino acids.
No. The sequence has no cysteine residues, so disulfide bridges cannot form. That feature makes it easier to handle than many small proteins that depend on multiple cysteines for structure.
It is a synthetic peptide. Its design was inspired by a fragment of a protein found in human gastric juice, but the fifteen-amino-acid molecule itself is made in a laboratory and is not a normal component of food or of human tissue in appreciable amounts.