A practical reference on Melanotan II: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-02-23 and is reviewed periodically as new material appears.
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.
Receptor-binding studies classify melanotan II as a non-selective melanocortin agonist. It interacts with MC1R, MC3R, MC4R and MC5R, with reported affinities in the low nanomolar range and no strong subtype preference. Activation of MC1R on dermal melanocytes shifts pigment synthesis toward eumelanin, the dark polymer deposited in melanosomes and transferred to keratinocytes. Because the same peptide engages MC4R in the hypothalamus, it also appears in animal work on food intake and erectile response, which is why it is discussed in both pigment and metabolic research. Which receptor populations dominate after systemic exposure in humans is not fully established.
Early published reports described melanotan-2 as a tanning agent without sun protection, which means darkening is not the same as protection against ultraviolet radiation. Later studies explored the peptide in erectile dysfunction, hemorrhagic shock, and some skin conditions. No regulator in the United States or Europe has approved it for clinical use. Many products labelled melanotan-2 are sold without approval and their identity and purity are unverified. Its long-term safety in humans remains an open question.
Melanotan-2, also written Melanotan II, is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone. Its sequence is Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, and the lactam bridge between the aspartate and lysine side chains constrains the peptide into a ring. This structural change increases receptor affinity and metabolic stability relative to the native hormone. The compound was created in the 1980s as a research tool for studying pigmentation biology.
| 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 |
The compound was developed in the late 1980s and 1990s by academic researchers investigating photoprotection. The rationale held that stimulating melanin production might reduce ultraviolet damage to skin and lower skin cancer risk. Early work examined receptor binding, pigment response, and short-term tolerability in small studies. That program did not produce an approved drug, and formal development stalled after early-phase trials. Whether induced pigmentation confers meaningful photoprotection remains an open question.
Outside regulated medicine, melanotan II circulates through online vendors as a research chemical, often marketed for tanning. Products sold this way vary widely in purity, concentration, and labeling accuracy, and independent testing has documented discrepancies. Published reports describe both pigment effects and adverse reactions, including nausea, flushing, and darkening of existing moles. Long-term safety data are sparse, and no large controlled trial has established a risk profile. Questions about cumulative effects on melanocytes remain unresolved in the literature.
Melanotan II is a synthetic peptide analog modeled on alpha-melanocyte-stimulating hormone, a naturally occurring signaling peptide involved in pigmentation. Its structure is a cyclic heptapeptide containing two non-natural substitutions, norleucine at position four and D-phenylalanine at position seven. These modifications resist enzymatic breakdown and extend the molecule's activity relative to the native hormone. The compound binds melanocortin receptors and is studied mainly as a pharmacological tool rather than a therapeutic product. It has never received approval as a medicine in any major jurisdiction.
UK academic and end-user community funded by UKRI: UK Metamaterials Network UK Government Rapid Technology Assessment looking at Metamaterials PwC Tech Translated: Metamaterials Centre for Metamaterial Research and Innovation, University of Exeter, UK www.metamaterials.center Institute of Physics, Impact Project Pathway "Commercialising Metamaterials"
== See also == Bioengineering Directed evolution Hachimoji DNA List of genetic codes Nucleic acid analogue Non-proteinogenic amino acids Protein labelling Protein methods Synthetic biology Xenobiology
From 15 to 20 February, the Battle of Wadi al-Batin took place inside Iraq; this was the first of two attacks by 1 Battalion 5th Cavalry of the 1st Cavalry Division. It was a feint attack, designed to make the Iraqis think that a coalition invasion would take place from the south. The Iraqis fiercely resisted, and the Americans eventually withdrew as planned back into the Wadi al-Batin. Three US soldiers were killed and nine wounded, with one M2 Bradley IFV turret destroyed, but they had taken 40 prisoners and destroyed five tanks, and successfully deceived the Iraqis. This attack led the way for the XVIII Airborne Corps to sweep around behind the 1st Cav and attack Iraqi forces to the west. On 22 February 1991, Iraq agreed to a Soviet-proposed ceasefire agreement. The agreement called for Iraq to withdraw troops to pre-invasion positions within six weeks following a total ceasefire, and called for monitoring of the ceasefire and withdrawal to be overseen by the UN Security Council. The coalition rejected the proposal, but said that retreating Iraqi forces would not be attacked, and gave 24 hours for Iraq to withdraw its forces. On 23 February, fighting resulted in the capture of 500 Iraqi soldiers. On 24 February, British and American armored forces crossed the Iraq–Kuwait border and entered Iraq in large numbers, taking hundreds of prisoners. Iraqi resistance was light, and four Americans were killed.
=== Mating === When ready to mate, cabbage loopers display by elevating their abdomen and fanning their wings. Males also fan out their abdominal hairs, open their genital claspers, and partially stick out their spermatophores. Males gradually expose more of their spermatophores as they wait for a mate. Upon interest, a potential mate examines the other's abdomen with antennae, and mating occurs if both agree. Mating on average occurs at 2am, but has been observed occurring between 12 and 4am. Mating generally occurs 3–4 days after emergence, but can occur up to 16 days afterwards. Usually, mating does not occur before the third day, as eggs are not fully developed upon emergence and require a few days to reach maturity. Multiple matings is a mating strategy where individuals have multiple mates in their lifetime. This is in contrast to monogamy, where individuals have one mate for life. Mating multiply can be advantageous to both sexes, which is why this strategy has evolved in many species, including the cabbage looper. For female cabbage loopers, rate of oviposition increases with the number of matings, and ultimately lay more eggs total. While it was once believed that multiple matings were necessary to fertilize all eggs, evidence shows that only one mating is needed to fertilize almost all eggs. Instead, it is more likely that the spermatophore provides nutrients to the female that confers reproductive benefits. This may explain why males produce female-attracting pheromones, as females may be seeking nutrient-rich spermatophores.
Tetrahydrofuran (THF), or oxolane, is an organic compound with the formula (CH2)4O. The compound is classified as heterocyclic compound, specifically a cyclic ether. It is a colorless, water-miscible organic liquid with low viscosity. It is mainly used as a precursor to polymers. Being polar and having a wide liquid range, THF is a versatile solvent. It is an isomer of another solvent, butanone.
Sources: en.wikipedia.org
Warden III, who largely planned the USAF attacks; within ten minutes of the attacks by 21 F117 aircraft on 38 targets, Iraq had lost its communications and radar; Lt-Col David Deptula; in the first wave were 4 Saudi Arabian Tornado aircraft, 4 Grumman A-6 Intruder and SEAD McDonnell Douglas F-4G Wild Weasel V aircraft, 5 Northrop Grumman EA-6B Prowler aircraft to provide electronic jamming of the Iraq airspace, and 21 McDonnell Douglas F/A-18 Hornet aircraft, each which dropped the AGM-88 HARM anti-radiation missile, to destroy the Iraq surface to air missile capability; Tomahawk missiles were fired from battleships in the Gulf and submarines in the Red Sea; the General Dynamics F-111 had around four thousand gallons of fuel; before advanced guidance systems for munitions, munitions would land according to the circular error probability, which was around a half-mile for a B-17 in World War II; the first laser-guided munitions were the Pave Tack system, which debuted on the F-111 in 1982, first deployed by F-111 aircraft from RAF Lakenheath; Duncan Lennox, editor of Jane's Strategic Weapon Systems; Theodore Postol; on one evening, twenty-eight MIM-104 Patriot missiles were launched against five ballistic missiles, which had broken up on re-entry to the earth's atmosphere - hitting any of these fractured ballistic missiles was almost impossible, due to the unforeseen changing aerodynamics; Lt-Col George Cusimano, deputy director of the USAF joint; the joint also deployed synthetic-aperture radar, to give a fuller view of ground forces, from the AN/APG-76 Doppler radar; the ground picture could be relayed to ground forces, such as in the Battle of Khafji on 29 January 1991; Royal Scots 1st Battalion, with GKN Warrior tracked armoured vehicles and Major John Potter; the experimental Ferranti TIALD laser-guided munitions were deployed by RAF Panavia Tornado aircraft to destroy Iraq hardened aircraft shelters in February 1991; 39th Regiment Royal Artillery deployed the M270 Multiple Launch Rocket System (MLRS); the land battle began on 24 February 1991, watched by the DOAE in Surrey; the land war did not last long, and on 26 February 1991 retreating Iraqi vehicles and tanks were systematically destroyed by AGM-114 Hellfire missiles, launched from undetected Boeing AH-64 Apache helicopters, resulting in total destruction; the USS Wisconsin battleship fired at Failaka Island, with surveillance provided by its AAI RQ-2 Pioneer drone. Narrated by Edward Hardwicke, directed by Chris Haws, produced by Richard Melman, made by InCA Productions 18 August The Healing Mind, about the field of psychoneuroimmunology; psychiatrist Janice Kielcolt-Glaser of Ohio State University College of Medicine; psychologist Barrie R. Cassileth; chemical pathologist Malcolm Carruthers takes a blood sample from a candidate, who has been driven around Brands Hatch at 115 mph; Theodore Melnechuk of the University of California; the body's immune system - the phagocytes destroy foreign bacteria, the natural killer cells destroy the body's own cells that are too damaged, and the lymphocyte T cells and B cells remember pathogens, with a corresponding antibody; experimental psychologist Robert Ader of the University of Rochester Medical Center conducted research on rats in 1975, with cyclophosphamide, which weakens the immune system, and immunologist Nicholas Cohen; prolonged secretion of endogenous opioid peptides may lower the immune function; neuroscientist David L. Felten of the University of Rochester; psychoimmunologist Nick Hall of the University of South Florida College of Medicine and an experiment with drama students, where lowering of T cells was found; Kathleen Dillon of Western New England College, where an experiment measured Ig A of candidates who watched types of television content, and found that Ig A temporarily increased with amusing content; psychiatrist Fawzy Fawzy of the University of California; psychiatrist Margaret Kemeny of UCLA. Narrated by Geoff Watts (of Radio 4's former Science Now series, produced by Geoff Deehan in the 1970s), directed by Yavar Abbas, produced by Geoff Deehan, made by Sandlin Productions 25 August Spacesuit, the spacesuits that astronauts wore during the Apollo missions to the Moon, and whether such spacesuits would be advanced enough to be worn for future missions to Mars; by 2020, NASA expected to have landed on Mars; at sea-level, air pressure is 14 PSI; ILC Dover in Newark, Delaware has made all NASA spacesuits since the late 1960s; medical research at the Ames Research Center; Joe Kosmo, head of NASA spacesuit design; the invention of the defecation-mitten by Matthew Radnofsky; Bruce Webbon of the Ames Research Centre; the Johnson Space Center also worked on suit design. Directed by Patrick Uden, made by Uden Associates 1 September The Falls, about the Niagara Falls. Produced by Clare Odgers, made by the National Film Board of Canada and Primitive Features 8 September Re-inventing Japan, looking at Japan's success in applied science, contrasted with less success in pure science and whether Japan could enhance its pure science industry enough, which has connections with a country's own cultural values and outlook, and how Britain has excelled in pure science, but how much that university funding cuts could erode Britain's prowess in pure science; Japan few Nobel prizes, but excelled at applied science and exploiting others' research by reverse engineering; Canon had £6bn of sales, of which 40% were photocopiers, such as the L5; Hajime Mitarai, research director of Canon, and how Canon had eight product divisions, with their own engineering staff in each division, with process physicists and inorganic chemists; with Western science innovations, it often came from a set of individuals, whereas Japan's innovation culture revolved around much intense group cooperation, not individuals; Japan had only won five Nobel prizes since the 1950s - the US had won 135; a youthful Matt Ridley of The Economist; Fujitsu was the world's second-largest manufacturer of computers, and had bought ICL (which had been Ferranti) in 1990, and sold £10bn a year; Naoki Yokoyama and Takahiko Misugi of Fujitsu; Japan could not rely on other countries research anymore, and had to conduct more in-house research; Japan's culture was not greatly known for originality or taking risks, or being surprised; pathologist Sir Anthony Epstein and how Japan greatly revered tradition, and conformity, possibly viewing anyone who didn't likewise confirm as troublesome; electrical engineer Hiroya Fujisaki, of Tokyo University and known for the Fujisaki model, and that he thought that Japan's culture had historically eroded originality; the national research organisation Riken was formed in 1917, and made great progress, with a large cyclotron, and visited by Einstein in December 1922, but the US was suspicious after the war, and destroyed Riken's cyclotron; Minoru Oda, head of Riken from 1988 to 1993; the US distrusted Japan, and preferred Japan to work on mainly applied science; physicist Akira Tonomura at the Hitachi Advanced Laboratory, which had the world's largest electron microscope; Shojiro Asai of Hitachi; the Canon Advanced Research Laboratory; the Tsukuba Science City and the University of Tsukuba, built by the Japanese government for £6bn, and home of the Japanese ERATO science innovation agency; Genya Chiba, director of ERATO; Michio Nagai, former minister of education in the mid-1970s. Directed by Bob Bee, produced by Michael Wills (later Labour MP from 1997 to 2010 for North Swindon), and made by Juniper Productions 13 September Theme Park Heaven, Walt Disney; Sylvère Lotringer of Columbia University; Arrow Dynamics of California, with Dal Freeman Ron Toomer; David Lewis; Cedar Point, built by Custom Coasters International of Cincinnati; Eric Westin of Walt Disney Imagineering, and the Big Thunder Mountain Railroad ride; Marc Davis, who drew Tinkerbell in Peter Pan, and who worked on the Pirates of the Caribbean ride, which opened in 1967; Larry Lester and David Codiga of Universal Studios, and their earthquake Studio Tour and Backdraft rides; Dreamland in 1912; psychologist Timothy Leary; Douglas Trumbull and the Back to the Future: The Ride and Luxor Las Vegas; Stan Kinsey of SimEx-Iwerks; Michael Ryder and Thom Dickeson of Evans & Sutherland, and texture mapping onto polygons, a main feature of transportation simulations; Bob Stone of the Advanced Robotics Research Centre at the University of Salford. Narrated by Richard O'Brien, produced by Jerome Kuehl, directed by Graham Moore, made with WGBH and Open Media 22 September The Professor's New Clothes, a re-broadcast of an Australian documentary about Professor Vishwa Jit Gupta of Panjab University and his fraudulent work about paleontology of the Himalayas. Directed by Stephen Ramsey, produced by Janet Bell, and made by Film Australia 29 September The Gambler's Guide to Winning, the ways of deploying mathematical techniques to win in gambling, with probability theory methods developed by Prof Edward O. Thorp of University of California, Irvine; the disastrous 1967 Grand National, where nearly all the horses fell at the 23rd fence; Frank Honywill George of Brunel University; Ralph Abraham of University of California, Santa Cruz; Peter A. Griffin of California State University, Sacramento; the gambler's fallacy; J. Doyne Farmer of the Santa Fe Institute. Narrated by Andrew Burt, directed by Julian Nott (son of the Conservative former defence secretary Sir John Nott, who later composed the music for Wallace and Gromit films such as The Wrong Trousers), produced by Jenny Barraclough, made by Peninsula Films 6 October Superpowers?, with Ray Hyman, about the international group of sceptics Committee for Skeptical Inquiry, who dispute topics such as UFOs, made by Open Media 13 October The Lean Burn Machine, about the development of catalytic converters for automotive engines, and how they cause more fuel to be burned than before, and the British engineer Geoffrey West who has produced an alternative, but faced restrictions from EC (EU) legislation; Europe introduced pollution legislation in July 1992; California had the worst vehicle pollution in the US, notably LA; the Clean Air Act; Rob Searles of Johnson Matthey; German environment minister Bernd Schmidbauer - Germany had over two-thirds of European car exports to the US; French physicist Hubert Curien, Minister of Higher Education, Research and Innovation from 1988 to 1993; chemistry graduate Margaret Thatcher being interviewed on 2 March 1989 on the BBC, and lean-burn engines; Bernard Bertrand, head of engine development of Peugeot; Shillington of BL; the new EC legislation in 1992 would outlaw lean-burn powered cars; Dutch automotive writer Gerard Sauer. Narrated by Nick Ross, directed by Nick Abson and Simon Broom, produced by Michael Blakstad (Editor from 1974 of Tomorrow's World), made by Workhouse 20 October The Elements, the poet Roger McGough narrates poetry for each element and how the Periodic Table came to be formed; 5% of the Earth's crust is iron; xenon is found in strobe lights; argon is in domestic incandescent light bulbs; the light bulb filament is tungsten, but reserves of tungsten are low. Directed by Ian Duncan, produced by David Dugan, made by Windfall Films (part of Argonon). Shown on 25 November 1992 on The Nature of Things in Canada 27 October The Strange Case of Crop Circles, an update to the documentary made in 1990, looking at why the 250 crop circles that appeared in the summer, that around 50% of the circles appeared in Wiltshire; the phenomenon took off after a circle near Westbury was pictured in a local newspaper in 1980; Tim Carson charged £1 per visitor to a circle in 1990, and 7,000 visited the Eastfield Pictogram at Alton Barnes, near Milk Hill; Steve Woolgar; Sir Francis Graham-Smith of the Royal Society, who dismissed those people interested in crop circles as mixed company who talked a lot of rubbish and it was a profit-less business to get involved with people who were completely hooked on the unknown; Serena Roney-Dougal; a youthful-looking Matt Ridley of The Economist said that since episodes with nuclear power in the 1970s, people had questioned evidence that scientists had told them; physicist Terence Meaden, who founded TORRO; Yoshi-Hiko Ohtsuki of Waseda University, who researched ball lightning. Narrated by Gavin Weightman, directed by Jill Freeman, and produced by her husband Michael Wills, made by Juniper Productions 3 November Human Waste, new ways of treating excrement such as dry compost toilets, oxidation pools and greenhouses. Directed by Kate Woods (Australian), made by John Blake Associates
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Flupentixol (INN), also known as flupenthixol (former BAN), marketed under brand names such as Depixol and Fluanxol is a typical antipsychotic drug of the thioxanthene class. It was introduced in 1965 by Lundbeck. In addition to single drug preparations, it is also available as flupentixol/melitracen—a combination product containing both melitracen (a tricyclic antidepressant) and flupentixol (marketed as Deanxit). It is approved for use in the UK, Australia, Canada, Russian Federation, South Africa, New Zealand, Philippines, Iran, Germany, among others. Flupentixol is not approved for use in the United States.
== Pharmacology == 18-MC is a α3β4 nicotinic antagonist and, in contrast to ibogaine, has no affinity at the α4β2 subtype nor at NMDA-channels nor at the serotonin transporter, and has significantly reduced affinity for sodium channels and for the σ receptor, but retains modest affinity for μ-opioid receptors where it acts as an agonist, and κ-opioid receptors. The sites of action in the brain include the medial habenula, interpeduncular nucleus, dorsolateral tegmentum and basolateral amygdala. (±)-18-MC competitively inhibits α9α10 nAChRs with potencies higher than that at α3β4 and α4β2 nAChRs and directly blocks CaV2.2.
Sources: en.wikipedia.org
=== Scope and related laser-based procedures === LANAP is commonly described as a wavelength-dependent, flapless periodontal pocket treatment protocol performed with an Nd:YAG laser (1064 nm). Other minimally invasive or adjunctive laser approaches to periodontal and peri-implant pocket therapy using different wavelengths have been described and are distinct from LANAP. A review reports that CO2 laser systems share soft-tissue applications with diode and Nd:YAG lasers (bacterial reduction, debridement in pockets and around implants, and coagulation), but that clinical studies and meta-analyses have not consistently shown statistically significant improvements versus mechanical debridement alone. For peri-implant diseases, an AAP best-evidence review and meta-analysis reported that laser therapy in combination with surgical or non-surgical therapy provided minimal benefit for several clinical outcomes, and noted that the controlled evidence included in the analyses was limited to Er:YAG, CO2 laser, and diode lasers. In 2016, the FDA cleared labeling for an Nd:YAG system that included an indication describing “promotion of true regeneration” (new cementum, periodontal ligament, and alveolar bone) when used specifically in the LANAP protocol. A 2017 review concluded that studies of lasers in the treatment of periodontitis had not provided sufficient evidence that laser use provides benefit over traditional therapy.
== Symptoms and signs == In the event more ATP is needed from the affected pathway, the lack of it becomes an issue and symptoms develop. People with a metabolic myopathy often experience symptoms such as:
According to Smith's account, "each one, quietly but firmly, without hesitation, said: 'Yes'." At 11:00 local time on 11 November 1965, Armistice Day, during the traditional two minutes' silence to remember the fallen of the two World Wars, Smith declared Rhodesia independent and signed the proclamation document, with Dupont and the other 10 ministers of the Cabinet following. The timing was intended to emphasise the sacrifices Rhodesia had made for Britain in wartime. As Ken Flower later said, "the rebellion was made to appear as though it was not a rebellion". Smith and his ministers still pledged allegiance to Queen Elizabeth II, whose official portrait hung prominently behind them as they signed; the declaration even ended "God Save The Queen". Four junior members of the Cabinet—Lance Smith, Ian Dillon, Andrew Dunlop and P. K. van der Byl—did not sign, but were included in the official photograph.
=== Gestational breast hypertrophy === This same effect can also occur at the onset of pregnancy or between the 16th to 20th week of gestation. When the swelling in the connective tissue occurs after birth, it can negatively impact long term milk supply. The swelling increases with each subsequent pregnancy. The extremely rapid growth of the breasts can result in intense heat. The woman's breasts can generate extraordinary discomfort, turning feverish, red, itchy, and even causing the skin to peel. The swelling can suppress the milk supply, pinching off the milk ducts, and leading to mastitis. Gestational gigantomastia is estimated to occur in 1 out of every 28,000 to 100,000 pregnancies. Breast size in women with gestational breast hypertrophy typically reverts to approximately pre-pregnancy size or near it after pregnancy and cessation of breastfeeding. This is not always the case however and in some only partial reduction in breast size may occur, necessitating surgical breast reduction.
Heated tobacco products were first introduced in 1988, but were not a commercial success. BLOW started selling e-hookahs, an electronic version of the hookah in 2014. The handle of each hose for the e-hookah contains a heating element and a liquid, which produces vapor. Gopal Bhatnagar, based in Toronto, Canada, invented a 3D printed adapter to turn a traditional hookah into an e-hookah. It is used instead of the ceramic bowl that contains shisha tobacco. Rather than the tobacco, users can insert e-cigarettes. Other non‑nicotine aerosol‑generating devices use technology similar to that of electronic cigarettes. Fog machines and haze machines, commonly used in entertainment venues, heat glycol‑based liquids to produce aerosols for visual effects. Industry standards organizations note that the droplets produced by theatrical fog and haze fall within the size range of particulate matter (PM2.5), a classification based on particle diameter. Recent research has shown that heating glycol‑based fluids in both fog and haze machines and electronic cigarettes can produce similar thermal degradation byproducts, including carbonyl compounds such as formaldehyde.
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.
No. It is a laboratory-made peptide, while the natural hormone is alpha-melanocyte-stimulating hormone, a longer peptide produced by the pituitary gland and by skin cells. Melanotan-2 mimics only a short active region of that hormone and contains non-natural residues such as D-phenylalanine.