A practical reference on afamelanotide: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-07-12. Anything still debated is marked as such rather than presented as settled.
Published pharmacokinetic information is limited and comes mainly from small studies rather than registrational trials. Plasma half-life is usually described as short, on the order of tens of minutes, followed by rapid tissue distribution and clearance of the intact peptide. Metabolites and low concentrations of parent compound have been reported in urine, a detail relevant to anti-doping and forensic testing. Whether repeated exposure changes receptor sensitivity or clearance over time remains an open question. Values differ noticeably between analytical assays, so published numbers should be read as approximate rather than definitive.
Melanotan II is a synthetic cyclic heptapeptide with the sequence Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, corresponding to a molecular formula of C50H69N15O9 and a monoisotopic mass near 1024 daltons. It was designed as a structural analogue of alpha-melanocyte-stimulating hormone, a peptide hormone produced by cleavage of proopiomelanocortin. A lactam bridge between the aspartate and lysine side chains closes the ring, and the C-terminal amide removes a free carboxyl group. Both modifications increase resistance to enzymatic degradation compared with the linear parent hormone. Four substitutions distinguish it from afamelanotide, the linear analogue studied under the name melanotan I.
Independent verification is central to quality control because the compound is not produced under pharmaceutical manufacturing standards. Third-party laboratories can measure purity, identity, residual solvents, and microbial contamination, though the scope of testing varies between services. Reported analyses of vendor samples have shown batch-to-batch variation in peptide content and the presence of truncated or oxidized species. How much of this variation reflects synthesis conditions versus storage and shipping is not well characterized. No harmonized reference standard exists for the material as sold.
Handling guidance for melanotan II follows general practice for small synthetic peptides rather than a product-specific monograph. Lyophilized powder is typically kept at minus twenty degrees Celsius or colder, protected from light and moisture, because warmth and humidity accelerate degradation. Once reconstituted, solutions are usually refrigerated and used within a short window, as hydrolysis and microbial growth both become concerns. Repeated freeze-thaw cycles are generally avoided. These conventions come from laboratory peptide chemistry and not from formal stability studies on this specific compound.
Analytical confirmation of identity relies on mass spectrometry, most often coupled to liquid chromatography. Reversed-phase high-performance liquid chromatography separates the peptide from related impurities and provides a purity estimate based on peak area. Electrospray ionization mass spectrometry then confirms the expected molecular mass, while tandem mass spectrometry can map the fragment sequence. For research-grade material, these two techniques together form the standard minimum. Purity figures reported by vendors are frequently not traceable to an independent laboratory.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C50H69N15O9 | Cyclic heptapeptide, C-terminally amidated |
| Approximate molecular mass | 1024 Da | Monoisotopic mass of the free peptide |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility class | Soluble in water and polar solvents | Also dissolves in neutral aqueous buffer |
| Common synonyms | Melanotan II, MT-II, MT-2 | Described as a melanocortin agonist in early literature |
Receptor binding at MC1R on melanocytes raises intracellular cyclic AMP and increases expression of tyrosinase and related enzymes. The downstream result is greater synthesis of eumelanin, the dark pigment, without ultraviolet exposure acting as the trigger. The compound is not selective, however, and also engages MC3R, MC4R and MC5R, which are expressed in the central nervous system and elsewhere. That lack of selectivity is the explanation usually offered for effects reported outside pigmentation, including appetite suppression and nausea. Selectivity remains a central theme in comparative studies of related peptides.
Human data remain limited and mostly short-term. Reports describe small trials and observational accounts rather than large controlled studies, so questions about dose-response relationships and long-term effects on melanocytes stay open. Whether repeated exposure alters naevus behaviour is not settled in the published record. Researchers also note that self-administered use outside clinical settings makes actual exposure difficult to quantify. Statements about efficacy and safety should therefore be read as preliminary rather than established.
Melanotan II is a synthetic cyclic heptapeptide that acts as an agonist at melanocortin receptors. It was designed as a structural analogue of alpha-melanocyte-stimulating hormone, the endogenous peptide involved in pigment production. The analogue carries a lactam bridge that constrains the ring and slows enzymatic breakdown relative to the native hormone. In research literature it appears under several abbreviations, and naming conventions are not fully standardized. Published descriptions usually place it within the broader melanocortin agonist family.
Because the substance circulates mainly through informal markets, verification is a recurring theme in technical discussion. Independent analyses have found that labeled content and actual content can diverge, and that purity varies between samples. Analytical laboratories use reversed-phase chromatography to separate components and mass spectrometry to confirm identity. Isotope-labeled internal standards improve quantification in complex matrices. Such methods describe what a sample contains but say nothing about its sterility, lawful status, or suitability for any use. Open questions remain about how consistently testing is applied across the supply chain.
Regulatory treatment of this peptide varies by country. It holds no marketing authorization as a medicine in the United States, the European Union, or most other jurisdictions. Some countries classify products containing it as prescription-only or unlicensed medicines, which restricts lawful supply. Authorities have issued public notices warning that unregulated products may contain undeclared or incorrect ingredients. The molecule also appears on prohibited lists for competitive sport. These measures address supply oversight rather than any approved therapeutic role.
Melanocortin receptors comprise five subtypes with distinct tissue distributions and functions. Melanotan-2 is described in the literature as a non-selective agonist that engages several of these subtypes, including MC1R, MC3R, MC4R, and MC5R. MC1R is the subtype most directly linked to melanin production in skin cells. Because the compound is not subtype-selective, its observed effects in experimental settings are generally attributed to activity across multiple receptor pathways rather than to a single target.
Melanotan-2 is a synthetic linear peptide built from seven amino acids arranged in a short chain. Its sequence is commonly written as Ac-Nle-Asp-His-D-Phe-Arg-Trp-Lys-NH2, which includes a modified N-terminus and an amidated C-terminus. The molecule belongs to the melanocortin family and acts as a receptor agonist. Structural features such as the D-phenylalanine residue and the Nle substitution are associated with increased stability against enzymatic degradation relative to the natural parent peptide.
Feltenstein then took control of Thomas's care, even though he did not have admitting rights at St. Vincent's. The hospital's senior brain specialist, C. G. Gutierrez-Mahoney, was not called to examine Thomas until the afternoon of 6 November, some 36 hours after Thomas's admission. Caitlin, having flown from Britain, arrived at the hospital the following morning, by which time a tracheotomy had been performed. Her first words are reported to have been, "Is the bloody man dead yet?" Permitted to see Thomas for a short time, she returned, drunk, in the afternoon and made threats to John Brinnin. Feltenstein had her put into a straitjacket and committed to the River Crest Sanitarium. It is now believed that Thomas had been suffering from bronchitis, pneumonia, emphysema and asthma before his admission to St Vincent's. In their 2004 paper, Death by Neglect, D. N. Thomas and former GP Principal Simon Barton disclose that Thomas was found to have pneumonia when he was admitted to hospital in a coma. Doctors took three hours to restore his breathing, using artificial respiration and oxygen.
On November 19, 2019, a lawsuit was filed by a vegan from Atlanta, Georgia, against Burger King for allegedly failing to clearly disclose that Impossible Whopper burgers were heated on the same grill as their beef burgers. The lawsuit was dismissed. On March 28, 2022, a lawsuit was filed against Burger King, alleging the fast food chain falsely advertised the Whopper to "look about 35% bigger in its advertising than it is in reality". On May 5, 2025, Federal Judge Roy Altman allowed the case to proceed, stating the claims may reasonably suggest consumers were misled and that Florida law permits such misrepresentation suits without a special relationship. Burger King argued that differences between ads and actual burgers are typical of handmade food and standard marketing practices.
=== Fatigue === Fatigue is a common symptom of fibromyalgia. Patients may experience physical or mental fatigue. Physical fatigue can present as a feeling of exhaustion after exercise or limitation in daily activities. Fibromyalgia fatigue can range from feeling mildly tired to flu-like exhaustion. Severe fatigue may come on suddenly, making it difficult to be active at all. The impact of fatigue can be severe and pose more of a problem than the pain. Fatigue is a complicated, multifactorial, and vexing symptom that is highly prevalent (76%) and stubbornly persistent, as evidenced by longitudinal studies over 5 years. Fatigue does not improve with sleep or rest. Medication seems to have little impact on FM fatigue.
==== Conditions for higher transfer results ==== Nearly complete transfer in systems implementing countercurrent exchange, is only possible if the two flows are, in some sense, "equal". For a maximum transfer of substance concentration, an equal flowrate of solvents and solutions is required. For maximum heat transfer, the average specific heat capacity and the mass flow rate must be the same for each stream. If the two flows are not equal, for example if heat is being transferred from water to air or vice versa, then, similar to cocurrent exchange systems, a variation in the gradient is expected because of a buildup of the property not being transferred properly.
Aromatic L-amino acid decarboxylase (AADC or AAAD), also known as DOPA decarboxylase (DDC), tryptophan decarboxylase, and 5-hydroxytryptophan decarboxylase, is a lyase enzyme (EC 4.1.1.28), located in region 7p12.2-p12.1.
Sources: en.wikipedia.org
Some ministers (for example Peter Walker) and civil servants believed Heseltine could have been persuaded to return had it not been for the public announcement. At 4pm that day Heseltine delivered a 3,000 word, 22 minute resignation statement at the Ministry of Defence (rather than waiting to make a statement to the House of Commons when it resumed four days later). He may well have prepared this earlier, although his private secretary Richard Mottram says not. To Thatcher's fury Defence officials had helped him throughout the crisis and in preparing this document. His statement denounced Thatcher's managerial style and suggested she was a liar who lacked integrity. Thatcher later said during a television interview that she had not sacked him or called him to order before the incident because, “Had I done that, I know exactly what the press would have said: there you are, old bossyboots at it again.”
Pea protein can be used as a protein substitute for those who cannot consume other sources as it is not derived from any of the most common allergenic foods (wheat, peanuts, eggs, soy, fish, shellfish, tree nuts, and milk). It may be used in baked goods or other cooking applications to replace common allergens. It is also processed industrially to form food products and alternative proteins such as alternative meat products, and non-dairy products. Manufacturers of alternatives produce a dairy alternative pea milk. Pea protein is also used in meat-alternatives and egg alternatives.
== Analytical methods == Several HPLC-UV methods have been reported for valdecoxib estimation in biological samples like human urine. Valdecoxib has analytical methods for bioequivalence studies, metabolite determination, estimation of formulation, and an HPTLC method for simultaneous estimation in tablet dosage form.
21 July The Bodyhunters, about the disappearance of Royal Marine Alan Addis; on 8 August 1980, Royal Marine went missing in North Arm; the Forensic Search Advisory Group, from the Home Office, was founded in 1988 by forensic archaeologist John Hunter of the University of Birmingham, with Sgt Mick Swindells of Lancashire Constabulary, providing the first evidence by an archaeologist in a British court; Swindells had found 5 yr old Rosie McCann, of Moorheys in Oldham, in only a few hours in March 1996, after she had disappeared on 14 January 1996 - the local police had been, conversely, searching for seven weeks and had not found anything in that time, and with the generous assistance of RAF search teams; the FSAG adopted a much different searching approach to typical police methods, with archaeology, more educated guesses, and applied geophysics; the individual was part of Naval Party 8901, to train locals in civil defence in 1980; Islands Radio; the team took ground-penetrating radar and five local policemen; three years previously detectives from Devon and Cornwall Police conducted an investigation and arrested four people - three of those were Titch Jaffray, Burnerd Peck and Tony Blake; the team were conducting a nine-day search in 1997; 80-90% of murders have disposal in known areas to the murderer; Chris Johnson was a former Royal Marine; the team looked in the cemetery first, with ground-penetrating radar, which could detect up to three metres below the surface, for irregularities; Tim Cotter, from the Royal Navy; the team knew that any disused buildings would be a plausible hiding place, as nothing is often suspected; in a search site, the team found mixed, or disturbed, soil. Narrated by Robin Ellis, made with the Discovery Channel 28 July Miracle Police, including the Audrey Santo case; personnel of the Roman Catholic Diocese of Worcester; the investigator Joe Nickell; Peter Gumpel of the Congregation for the Causes of Saints; evolutionary psychologist Robin Dunbar; John Polkinghorne of the University of Cambridge; Karen Armstrong, who wrote A History of God; the Lourdes Medical Bureau; Luigi Bommarito, Archbishop from 1988 to 2002 of the Roman Catholic Archdiocese of Catania. Narrated by Piers Gibbon, directed by Alexander Marengo, made by Ideal World with the Discovery Channel 4 August Dawn of the Death Ray, about the laser and its invention in July 1960; physicist Arthur Schawlow, inventor of the laser; testing of lasers took place at Kirtland Air Force Base, New Mexico, where an aircraft was first brought down with a laser in November 1973; a laser-equipped Boeing KC-135 was operated from 1973, by the 4900th Flight Test Group, led by Col John Otten, taking off in January 1975; fighter aircraft would launch air to air missiles, with insufficient fuel, at the aircraft, and the laser would attempt to shoot the missile down; after three years, on 26 May 1983, the laser shot down its first air to air Sidewinder missile; adverse atmospheric conditions often made an airborne laser ineffective; the White Sands Missile Range in New Mexico, and Leik Myrabo of the USAF Advanced Concepts Division; the 1991 Gulf War allowed much advanced technology to be fully evaluated - and Patriot missiles had mostly missed Iraqi Scud missiles; the Directed Energy Directorate of the Air Force Research Laboratory, and its Starfire Optical Range, and physicist Robert Fugate; John V. Breakwell; the USAF ordered seven airborne attack lasers, for delivery by 2008; Major-General Don Lamberson. Narrated by Michael Bywater, directed by Chris Durlacher, produced by David Dugan, made by Windfall Films 11 August Thin Air, about climbers on Mount Everest; in the 1996, eight participants on an Everest expedition died in one day; above 17,000 ft climbers experience weight loss and sleep loss; Peter Hackett (mountaineer); Ed Viesturs from Seattle; David Breashears, who made the documentary; when he was making a film in May 1996, eight climbers died in the 1996 Mount Everest disaster; climbers fly by helicopter to 9,000 ft, then climb to base camp at 17,600 ft; pulmonologist Brownie Schoene of the University of Washington School of Medicine in Seattle; psychologist Gail Rosenbaum; chronic mountain sickness and the portable hyperbaric bag, which is pumped to 2 PSI; the Khumbu Glacier and Khumbu Icefall; Guy Cotter of Adventure Consultants; the 'death zone' is above 26,000 ft; the Lhotse western face; the team reach the South Col, known as Camp VI; the Hillary Step; pulse oximetry and brain MRI scans are taken in Seattle. Broadcast on PBS as Everest - the death zone, when narrated by Jodie Foster. British edition narrated by Piers Gibbon, directed by David Breashears, made by Nova 18 August The Ten Plagues of Egypt, about the Plagues of Egypt in the Book of Exodus; Avi Weiss, who researched the Book of Exodus; doctor John S. Marr looked at the Ipuwer Papyrus, and worked with Curtis Malloy; marine biologist JoAnn Burkholder of North Carolina State University, and how Pfiesteria piscicida could be the first plague; Richard Wassersug of Dalhousie University in Canada, and a plague of frogs; entomologist Richard Brown of Mississippi State University in Starkville, Mississippi; public health entomologist Andrew Spielman of Harvard T.H. Chan School of Public Health; Roger Breeze of Plum Island Animal Disease Center; the final plague was likely caused by Stachybotrys chartarum, which made mycotoxin. Narrated by Jenni Murray, produced by Peter Spry-Leverton, directed by Bill Eagles, made by UFA GmbH and Café Productions, with The Learning Channel
Sources: en.wikipedia.org
The XM913 is an experimental American chain gun produced at Picatinny Arsenal. The cannon is a larger and more modern version of the 35 mm Bushmaster III chain gun, which itself is a larger version of the 25 mm M242 Bushmaster cannon. Although its shells, 50 x 228 mm, are twice the diameter of the 25×137mm cartridge of the M242, the 50mm cannon is not much longer than the smaller weapon. The overall lengths of the 25mm cannon and 50mm cannon are 105.2 inches (267 cm) and 117.7 inches (299 cm), respectively; while the portion of the gun that intrudes into the turret are 30.0 inches (76 cm) and 40.1 inches (102 cm), respectively. The XM913 has been selected as the primary weapon on the US Army's new Next Generation Combat Vehicle, the XM30 MICV.
Okara, from the Japanese 雪花菜(おから), is known as 雪花菜 xuěhuācài, in Chinese, lit. "snowflake vegetable"; 豆腐渣, dòufuzhā, also Chinese, lit. "tofu sediment/residue"; and 콩비지, kongbiji, in Korean). Sometimes known in the west as "soy pulp" or "tofu lees", okara is a tofu by-product consisting of the fiber, protein, and starch left over when soy milk has been extracted from ground soaked soybeans. It is often used as animal feed in most tofu-producing cultures, but also has other uses in Japanese and Korean cuisines, such as in the Korean stew kongbiji jjigae (콩비지찌개). It is also an ingredient for vegetarian burgers in many Western nations. In Japan, it is used to make ice cream.
== Importance == Two pathways appear to exist in L. plantarum for transforming pyruvate into D-lactate. One of them involves the NAD-dependent lactate dehydrogenase that directly produces D-lactate (LdhD), and the other is through the sequential activities of an L-specific lactate dehydrogenase followed by lactate racemase. If the LdhD enzyme is inactivated or inhibited, lactate racemase provides the bacterium with a rescue pathway for the production of D-lactate. This pathway is significant because the production of D-lactate in L. plantarum is linked to the biosynthesis of the cell wall. Mutants lacking LdhD activity that also had the lar operon deleted only produced L-lactate, and peptidoglycan biosynthesis was not able to occur.
Victoria confronts her father, General Byng, about the town's problems, and he instructs her to start taking her Joy again and check in on Dr. Verloc at Haworth Labs, where he is working on a permanent replacement for Joy. However, her progress is halted by a strike by the lab workers, who demand that Sally be reinstated to her position in the lab. After helping suppress the strike, Victoria confronts Dr. Verloc. Realizing that Dr. Verloc has no permanent solution and is willing to let the populace die off to "sustainable" levels, Victoria resolves to cut off the town's Joy supply to wean them off the drug. In order to achieve these, she destroys both the pill allocator and water treatment plant responsible for distributing Joy throughout the town. She is arrested and thrown in jail, where she remembers how her mother was imprisoned in India for supporting Indian independence from Britain. General Byng helps her escape, and informs her about his safe house where he has stockpiled supplies and an escape boat. Shocked at her father's cowardice and willingness to abandon the town to its fate, Victoria rejects his offer and resolves to save the town. In order to permanently stop all Joy production, she demolishes Haworth Labs, narrowly escaping its destruction. The combination of the destruction of the Joy supply and the broadcast of Uncle Jack's final recording sends Wellington Wells into complete anarchy as the enraged citizens slaughter each other.
In 2000, Wesley Enoch wrote and directed a modern adaptation titled Black Medea, which was first produced by Sydney Theatre Company's Blueprint at the Wharf 2 Theatre, Sydney, on 19 August 2000. Nathan Ramsay played the part of Jason, Tessa Rose played Medea, and Justine Saunders played the Chorus. Medea is re-characterised as an indigenous woman transported from her homeland to the city and about to be abandoned by her abusive social-climbing husband. Tom Lanoye (2001) used the story of Medea to bring up modern problems (such as migration and man vs. woman), resulting in a modernized version of Medea. His version also aims to analyze ideas such as the love that develops from the initial passion, problems in the marriage, and the "final hour" of the love between Jason and Medea. Roger Kirby's 2004 adaptation of the play, Medea in Jerusalem, was set in modern day Israel, and featured an Israeli-Jewish Jason and a Palestinian Medea who opts to turn her children into suicide bombers after being divorced by Jason. It premiered at the Rattlestick Playwrights Theatre in New York City. Kristina Leach adapted the story for her play The Medea Project, which had its world premiere at the Hunger Artists Theatre Company in 2004 and placed the story in a modern-day setting. Peter Stein directed Medea in Epidaurus 2005. Irish playwright Marina Carr's By the Bog of Cats is a modern re-telling of Euripides' Medea. In November 2008, Theatre Arcadia, under the direction of Katerina Paliou, staged Medea at the Bibliotheca Alexandrina (University of Alexandria, Egypt).
Sources: en.wikipedia.org
No. It is a synthetic analogue carrying four amino acid changes, a lactam ring and an amidated C-terminus. The natural hormone is a linear thirteen-amino-acid peptide processed from proopiomelanocortin.
Afamelanotide is the linear analogue [Nle4-D-Phe7]-alpha-MSH, sometimes called melanotan I, while melanotan II is cyclic and carries three further substitutions. The two are distinct molecules and are not interchangeable in analytical testing.
Binding to the four melanocortin receptor subtypes is well documented in vitro. The relative contribution of each subtype to whole-body effects in humans is far less certain.
The lyophilized powder is generally held at minus twenty degrees Celsius or below, away from light and moisture. Reconstituted solutions are typically refrigerated and used quickly. These practices derive from general peptide handling rather than a formal stability study.