The short version of pentapeptide fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-08-29 and is reviewed periodically as new material appears.
Ipamorelin is a synthetic pentapeptide classified as a growth hormone secretagogue. Its sequence, Aib-His-D-2-Nal-D-Phe-Lys-NH2, combines three non-proteinogenic residues with a C-terminal amide. The N-terminal aminoisobutyric acid unit and the two aromatic D-amino acids distinguish it from peptides assembled only from standard L-amino acids. Its formula is C38H49N9O5, corresponding to an average mass near 711.9 Da. At neutral pH the molecule carries a net positive charge, a property that shapes its behaviour in chromatographic and electrophoretic systems.
The compound was developed at Novo Nordisk during the 1990s as part of a programme seeking secretagogues with improved selectivity. It was described in the peer-reviewed literature in 1998 alongside related pentapeptides from the same series. Investigators advanced it because it raised growth hormone output in animal models while leaving other pituitary hormones comparatively unaffected. The development code NNC 26-0161 appears in earlier reports, and ipamorelin later became the common designation in published work.
Common solvents for laboratory work include water, buffered saline, and dimethyl sulfoxide. Once dissolved, the peptide is exposed to hydrolysis and oxidation, and alkaline conditions accelerate breakdown. Low-binding plasticware and the addition of a carrier protein reduce losses to container surfaces, which can otherwise be substantial at low concentrations. Solutions are typically kept cold and used within days. Investigators working with the compound generally prepare fresh working dilutions rather than storing dilute stocks, and they avoid repeated warming of the same vial.
Reversed-phase high-performance liquid chromatography is the standard method for purity assessment, most often on a C18 column with a water and acetonitrile gradient and trifluoroacetic acid or formic acid as an ion-pairing agent. Mass spectrometry by electrospray or matrix-assisted laser desorption confirms the expected mass and reveals truncated or modified sequences. Amino acid analysis and sequencing provide orthogonal structural evidence. Typical impurities include deletion sequences, oxidized products, and dimeric species. Detection wavelength, usually 214 or 220 nanometers, should be reported because response factors differ between peptides.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C38H49N9O5 | Pentapeptide with C-terminal amide |
| Average mass | Approximately 711.9 Da | Value derived from the formula |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility | Soluble in water and aqueous acetonitrile | Dissolution aided by acidic diluents |
| Common synonyms | Ipamorelin; NNC 26-0161 | Code name used in early reports |
Lyophilized material is generally stored cold and dry, with desiccant, and protected from light. In solution the peptide is more vulnerable: the histidine side chain can oxidize, and repeated freeze-thaw cycles promote aggregation and loss of material to container surfaces. A mildly acidic aqueous buffer is often used for short-term handling because it limits several degradation routes. Accurate prediction of long-term stability under a given set of conditions is difficult, and published stability data remain sparse.
Published discussion of this compound is uneven. Some references describe it as a tool for probing growth hormone regulation, while others focus on analytical characterization or on comparisons with related secretagogues. Statements about selectivity, half-life and potency often trace back to a small number of original reports that later authors cite secondhand. Readers evaluating a claim should therefore check whether a figure reflects a direct measurement or a repeated citation, and whether the underlying study was conducted in animals, in isolated cells or in human volunteers.
Most published work on ipamorelin comes from rodent studies and small early-phase human trials. Subcutaneous and intravenous routes have been used, while oral delivery is limited by poor absorption and rapid breakdown in the gut. The reported plasma half-life is short, on the order of two hours, and varies with species and assay method. Whether chronic use produces meaningful clinical benefit remains unresolved, and long-term safety data in humans are sparse. No major regulatory agency has approved the compound as a therapeutic drug.
Ipamorelin is a synthetic pentapeptide that belongs to the growth hormone secretagogue family. Its sequence is Aib-His-D-2-Nal-D-Phe-Lys-NH2, incorporating two non-natural residues that resist enzymatic breakdown. Researchers at Novo Nordisk described the compound in the 1990s while searching for agents that release growth hormone with fewer side effects than earlier secretagogues. The molecule acts as an agonist at the ghrelin receptor, also called GHS-R1a, which is expressed in the pituitary and in several peripheral tissues.
Selectivity distinguishes ipamorelin from first-generation secretagogues such as GHRP-6. At doses that reliably raise growth hormone, it shows little stimulation of adrenocorticotropic hormone or cortisol release in animal models, and it does not markedly raise prolactin or appetite. Binding at GHS-R1a on pituitary somatotrophs triggers calcium influx and pulsatile growth hormone secretion. Because the compound mimics the natural ghrelin signal, the release pattern tends to follow the body's own rhythm rather than producing a sustained elevation.
== Dipole moment == A helix has an overall dipole moment due to the aggregate effect of the individual microdipoles from the carbonyl groups of the peptide bond pointing along the helix axis. The effects of this macrodipole are a matter of some controversy. α-helices often occur with the N-terminal end bound by a negatively charged group, sometimes an amino acid side chain such as glutamate or aspartate, or sometimes a phosphate ion. Some regard the helix macrodipole as interacting electrostatically with such groups. Others feel that this is misleading and it is more realistic to say that the hydrogen bond potential of the free NH groups at the N-terminus of an α-helix can be satisfied by hydrogen bonding; this can also be regarded as set of interactions between local microdipoles such as C=O···H−N.
== Career == Dean's early films included The Last Affair (1976) and Continental Divide (1981). He appeared in three films starring Tom Cruise: Risky Business (1983), The Color of Money (1986), and Cocktail (1988). Other films include Teachers (1984), The Breakfast Club (1985), Code of Silence (1985), Nothing in Common (1986), Above the Law (1988), The Babe (1992), The Fugitive (1993), Rudy (1993), The Client (1994), Eye for an Eye (1996), Chain Reaction (1996), The Guardian (2006), and The Dark Knight (2008). His television roles included guest appearances in T. J. Hooker, Wiseguy, Perfect Strangers, NYPD Blue, Murder, She Wrote, ER, The West Wing, Chicago Hope, Without a Trace, CSI: Crime Scene Investigation, Cold Case, Still Standing, Numb3rs, Six Feet Under, Chicago P.D., as well as recurring roles playing Seattle cop Frank Collins in Frasier, Det. Marion Zeke Crumb in Early Edition, and Commanding Chief Fire Marshal of the CFD's Office of Fire Investigations James Whoritsky in Chicago Fire.
== Passport power == The Henley Passport Index 2019 measures how many nations a given passport can enter without a visa. It ranks 190 nations on the "strength" of its passport. Thailand was ranked 68 of 190 countries (1=strong passport; 190=weak passport). A Thai passport can gain entry to 75 nations visa free. Other ASEAN nations ranked were: Singapore, 2/189 countries visa-free; Malaysia, 12/179; Brunei, 21/165; Indonesia, 72/71; Philippines, 74/66; Cambodia, 84/54; Laos, 86/52; Vietnam, 87/51; Myanmar, 90/48. Arton Capital's Passport Index 2017 ranks 193 member nations of the UN, as well as six territories, a total of 199 passport-issuing entities, on the number of countries a given passport can enter either visa-free (VF) or with a visa on arrival (VOA). Thailand ranked 107th of 199 nations in the number of VF/VOA countries granting its citizens visa-less entry (1=most passport power; 199=least passport power). Other ASEAN nations ranked were Singapore, 3; Malaysia, 19; Brunei, 49; Philippines, 127; Indonesia, 137; Cambodia, 154; Vietnam, 159; Laos, 169; and Myanmar, 180. The Passport Index also ranks countries by the number of countries to which they extend VF or VOA visas, a "Welcoming Index". Thailand ranked 62nd of 104 nations (due to numerous ties) (1=most countries granted VF or VOA entry; 104=fewest countries granted VF or VOA entry). Other ASEAN nations ranked were Cambodia, 1; Laos, 15; Indonesia, 16; Malaysia, 17; Singapore, 18; Philippines, 19; Brunei, 70; Vietnam, 83; Myanmar, 96.
Sources: en.wikipedia.org
The March for Our Lives, a protest taking place in the aftermath of the Stoneman Douglas High School shooting in 2018 was described by various media outlets as being led by students and young people. Some even describe it as the political "awakening" of Generation Z or that these protesters were "the voice of a generation on gun control." While this massive protest was indeed organized by the survivors of the Parkland shooting, albeit with the assistance of well-resourced and older benefactors, the reality was a little more complicated. According to a field survey by The Washington Post interviewing every fifth person at the protest, only ten percent of the participants were 18 years of age or younger. Meanwhile, the adult participants of the protest had an average age of just under 49. Polls conducted by Gallup and the Pew Research Center found that support for stricter gun laws among people aged 18 to 29 and 18 to 36, respectively, is statistically no different from that of the general population. According to Gallup, 57% of Americans are in favor of stronger gun control legislation. In a 2017 poll, Pew found that among the age group 18 to 29, 27% personally owned a gun and 16% lived with a gun owner, for a total of 43% living in a household with at least one gun. Nationwide, a similar percentage of American adults lived in a household with a gun. (See chart.)
=== AIDS === It seems that Th22 cells could play a protective role in patients with AIDS. CCR5 and α4β7 molecules expressed by Th22 cells were able to bind to the circulating HIV receptor, and thus via interleukin-22 (IL-22) production protect against intestinal epithelial damage, leading to a mechanism of resistance against HIV-induced destruction of epithelial cell integrity.
Note: Other substances once thought to be vitamins were given B-numbers, but were disqualified once discovered to be either manufactured by the body or not essential for life. See § Related compounds for numbers 4, 8, 10, 11, and others.
In Somaliland, the Isaaq Sultanate was established in 1750. The Isaaq Sultanate was a Somali kingdom that ruled parts of the Horn of Africa during the 18th and 19th centuries. It spanned the territories of the Isaaq clan, descendants of the Banu Hashim clan, in modern-day Somaliland and Ethiopia. The sultanate was governed by the Rer Guled branch established by the first sultan, Sultan Guled Abdi, of the Eidagale clan. According to oral tradition, prior to the Guled dynasty the Isaaq clan-family were ruled by a dynasty of the Tolje'lo branch starting from, descendants of Ahmed nicknamed Tol Je'lo, the eldest son of Sheikh Ishaaq's Harari wife. There were eight Tolje'lo rulers in total, starting with Boqor Harun (Somali: Boqor Haaruun) who ruled the Isaaq Sultanate for centuries starting from the 13th century. The last Tolje'lo ruler Garad Dhuh Barar (Somali: Dhuux Baraar) was overthrown by a coalition of Isaaq clans. The once strong Tolje'lo clan were scattered and took refuge amongst the Habr Awal with whom they still mostly live. In the late 19th century, after the Berlin Conference of 1884, European powers began the Scramble for Africa. In that year, a British protectorate was declared over part of Somalia, on the African coast opposite South Yemen. Initially, this region was under the control of the Indian Office, and so administered as part of the Indian Empire; in 1898 it was transferred to control by London.
Sources: en.wikipedia.org
==== Schizophrenia ==== Modafinil and armodafinil were studied as a complement to antipsychotic medications in the treatment of schizophrenia. They showed no effect on positive symptoms or cognitive performance. A 2015 meta-analysis found that modafinil and armodafinil may slightly reduce negative symptoms in people with acute schizophrenia, though they do not appear useful for people with stable schizophrenia who have prominent negative symptoms (such as reduced motivation or social withdrawal). Among medications demonstrated to be effective for reducing negative symptoms in combination with antipsychotics, modafinil, and armodafinil are among the smallest effect sizes.
=== 3 May === The SAF said that the RSF fired several suicide drones towards Kassala Airport and Port Sudan, targeting Port Sudan Air Base and a goods warehouse and civilian facilities in the city, causing "limited damage". The SAF launched airstrikes on Nyala Airport following the landing of an aircraft believed to be transporting weapons to the RSF. The leader of the Otash IDP camp in Nyala, Abdel Razek Hassan Jalis, was shot dead along with his son and another camp resident in an attack by the RSF.
Several types of interactive products are: semi-permeable film dressings, semi-permeable foam dressings, hydrogel dressings, hydrocolloid dressings, hydrofiber and alginate dressings. Apart from preventing bacteria contamination of the wound, they keep the wound environment moist in order to promote healing. Semi-permeable film dressing: This dressing is a transparent film made up of polyurethane. It allows the movement of water vapor, oxygen, and carbon dioxide into and out of the dressing. It also plays an additional role in autolytic debridement (removal of dead tissue) which is less painful when compared to manual wound debridement inside the operating theater. It is highly elastic and flexible, thus is closely adhered to the skin. As the dressing is transparent, wound inspection is possible without removing the dressing. Due to the limited absorption capacity, such dressing is only used in superficial wounds with low amount of discharge. Semi-permeable foam dressing: This dressing is made up of foam with hydrophilic (attracted to water) properties and outer layer of hydrophobic (repelled from water) properties with adhesive borders. The hydrophobic layer protects the wound from the outside fluid contamination. Meanwhile, the inner hydrophilic layer is able to absorb moderate amount of discharge from the wound. Therefore, this type of dressing is useful for wound with high amount of discharge and for wound with granulation tissue. Secondary dressings are not required. However, it requires frequent changing and is not suitable for dry wounds.
Mary Brown's operated mainly in Newfoundland (about 20 locations with 2 locations in Halifax and 1 in Ontario) until the late 1970s, when it began expanding in Ontario, Alberta and Nova Scotia. In 2010, there were 38 locations in Newfoundland and Labrador, 30 locations in Ontario, 12 in Alberta and 3 in Nova Scotia, for an approximate total of 83. As of 2017, Mary Brown's has expanded into the United States, specifically in Florida. Drive-through and delivery services are available at some locations. The restaurant chain, started by Newfoundlanders Pat Tarrant and Cyril Fleming in 1969, was named after Mary Brown, the wife of a fried chicken recipe creator. The headquarters are in Markham, Ontario.
==== Maya Belizeans ==== The Maya are thought to have been in the Yucatán region and thus in Belize since the second millennium BCE. Classical Maya culture collapsed between the 7th and 9th centuries CE which left vast areas of Belize without population. Many Mayas also died in internal conflict and several hundred years later by catching disease from invading Europeans. Three Maya groups inhabit the country:
Sources: en.wikipedia.org
It is a synthetic five-amino-acid peptide that acts as a growth hormone secretagogue. Three of its residues are non-standard amino acids, and the chain ends in an amide rather than a free acid. The molecule is small enough that it can be characterised by routine peptide analytical techniques.
It has not received marketing approval as a medicine in the United States or the European Union. Supplied material is generally described and handled as a research chemical. Regulatory treatment varies by jurisdiction, and some countries restrict growth hormone secretagogues under sports or medicines legislation.
Earlier secretagogues were associated with broader hormonal responses, including measurable changes in cortisol and prolactin. Reports on this peptide describe a narrower profile in which growth hormone release is the most prominent effect. The observation is influential because it shapes how the compound is compared with other members of the same receptor family.
It is reported as the percentage of total peak area in a reversed-phase chromatogram. That number does not reflect water content, residual solvents, or counterions. The actual peptide content is therefore lower than the stated purity figure suggests.