If you have been reading about alpha-MSH analogue and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-01-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Melanotan-2 is a synthetic peptide designed as an analog of alpha-melanocyte-stimulating hormone, a signaling molecule produced in the pituitary and skin. Its structure is a linear chain of seven amino acids that folds into a ring through an internal lactam bridge joining two side chains. The compound is sometimes written as MT-II or MEL-2 in informal and commercial contexts. It belongs to the melanocortin peptide family, a group of short signaling molecules that share a conserved core sequence recognized by melanocortin receptors.
Two structural changes distinguish the synthetic peptide from the natural hormone. A norleucine residue replaces methionine at one position, and a D-configured phenylalanine replaces the natural L-form at another. Both substitutions slow enzymatic breakdown, which extends the molecule's persistence relative to the parent hormone. The lactam bridge further constrains the backbone into a stable conformation. These features are standard design strategies in peptide chemistry and are not unique to this compound; they appear across many research peptides built for improved stability.
The compound was developed in the late 1980s and early 1990s by academic researchers investigating melanocortin signaling and pigmentation. Early work explored whether synthetic analogs could reproduce effects of the natural hormone under controlled conditions. The molecule never advanced through the full regulatory pathway required for approval as a medicine. From the mid-2000s onward it appeared in unregulated consumer markets, often distributed through informal channels. That gap between research origins and commercial availability shapes how the compound is discussed today.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic cyclic heptapeptide | Melanocortin receptor agonist |
| Molecular formula | C50H69N15O9 | Neutral form, mass near 1024.2 g/mol |
| Primary targets | MC1R, MC3R, MC4R, MC5R | Binding is non-selective across subtypes |
| Related compounds | Alpha-MSH, melanotan I, afamelanotide | Structurally or functionally related peptides |
| Common abbreviations | MT-II, MT-2 | Naming in the literature is not uniform |
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone, a naturally occurring peptide involved in pigmentation signalling. Its sequence incorporates modified residues that increase potency and extend biological activity relative to the native hormone. The compound binds receptors of the melanocortin family and is examined mainly in laboratory research. It does not occur naturally and exists only as a manufactured chemical entity produced by solid-phase synthesis.
The peptide was developed during the 1980s by researchers investigating melanocortin signalling and skin pigmentation pathways. Early work focused on analogues of alpha-melanocyte-stimulating hormone that would resist enzymatic breakdown more effectively than the parent molecule. Melanotan-2 emerged from that programme as a shortened, cyclised variant. Reports describing its synthesis and receptor activity later appeared in the scientific literature. Commercial availability grew through unregulated channels rather than through pharmaceutical approval.
The presidents of the council were clearly the heads of government of the kingdom, holding the executive power that absolute monarchs had, but were restricted by the controlling power of the National Congress. With the advent of the Republic in the 5 October 1910 revolution, the head of government was renamed President of the Ministry (Presidente do Ministério). During this period the heads of government were under the strong power of the parliament and often fell due to parliamentary turmoils and social instability. With the 28 May 1926 coup d'état, and eventually, after the formation of the Estado Novo quasi-fascist dictatorial regime of António de Oliveira Salazar, the prime minister was again named President of the Council of Ministers, and was nominally the most important figure in the country. First Salazar and then Marcello Caetano occupied this post for almost 42 years. With the Carnation Revolution came the prime minister, which replaced the president of the council.
== External links == Magnesium at The Periodic Table of Videos (University of Nottingham) Chemistry in its element podcast (MP3) from the Royal Society of Chemistry's Chemistry World: Magnesium "Magnesium – a versatile and often overlooked element: New perspectives with a focus on chronic kidney disease". Clinical Kidney Journal. 5 (Suppl 1): NP. February 2012. doi:10.1093/ndtplus/sfs035. PMC 4455823. PMID 26069823. usgs.gov: Magnesium compounds and Magnesium Metal (Mineral Commodity Summaries 2025, p112-115)
In his 2011 paper Nature's Way of Making Audacious Space Projects Viable, he states that the Earth's non-renewable energy sources are nearly exhausted; natural gas will be depleted by 2020–2030, coal by 2035, uranium by 2056, while oil production peaked in 2006–2008. Nuclear energy cannot fully meet the world's energy needs (it represented only 6% in 2011). In addition, renewable energy cannot meet the growing demand for energy. Most of the minerals used by humans are in danger of becoming scarce; 11 minerals are already classified as having passed their peak production. For Metzger, humanity must therefore undertake a "100-year project" aimed at building a spacecraft ("100 Year Starship") capable of accessing the vast energy resources of the Solar System. For Metzger, it is even probable that if extraterrestrials coveted the energy resources of our Solar System, they would not look for them on Earth, but on the various asteroids and planetoids. Robotics is the only way to access so many dispersed resources, and humanity should embark on a second long-term project, which Metzger calls the "robotsphere", that would begin with the energetic exploitation of the Moon (estimated at 2.3×1012 J/year). This first step would make it possible to reach Type II in 53 years. Then the robotsphere (self-replicating and self-learning automated probes) would extend to the rest of the Solar System. Current advances in artificial intelligence suggest that the foundations of a robotsphere could be reached early in the next century, beginning in 2100.
Sources: en.wikipedia.org
== Scholarly career == Kermani majored in Middle Eastern languages and literature, with minors in philosophy and theater studies, at the University of Cologne, Cairo University, and the University of Bonn. During his semester breaks, he worked as an assistant director and later as a dramaturge at the municipal theaters Schauspiel Frankfurt and Theater an der Ruhr. Kermani wrote his master's thesis in 1993 at the University of Bonn (supervisors: Stefan Wild and Monika Gronke) on the persecuted Egyptian Koranic scholar Nasr Hamid Abu Zaid, whom he later met in Cairo and who had a formative impact on Kermani's approach to religious studies. With the support of the Studienstiftung des deutschen Volkes, Kermani wrote a dissertation entitled Gott ist schön (God is Beautiful), again under the supervision of Arabist Stefan Wild and Iranian studies scholar Monika Gronke. Kermani received his doctorate in Middle Eastern languages and literature at the University of Bonn in 1998. In 2006, he completed his postdoctoral dissertation entitled The Terror of God – Attar, Job, and the Metaphysical Revolt. From 2000 to 2003, Kermani held a long-term fellowship at the Wissenschaftskolleg zu Berlin (Institute for Advanced Studies Berlin), where he headed the Modernity and Islam working group. He initiated several international research projects, including the project Jewish and Islamic Hermeneutics as Cultural Criticism. This gave rise to a proposal for a Jewish-Islamic academy in Berlin.
Decreases in laboratory reimbursement have led to a decline in the number of NAACLS accredited MLS programs from ~700 in 1975 to ~240 programs in 2002, where it has held since. NAACLS program graduates are eligible to sit for American Society for Clinical Pathology(ASCP) certifications.
Transcription is the process by which the information contained in a section of DNA is replicated in the form of a newly assembled piece of messenger RNA (mRNA). Enzymes facilitating the process include RNA polymerase and transcription factors. In eukaryotic cells, the primary transcript is pre-mRNA. Pre-mRNA must be processed for translation to proceed. Processing includes the addition of a 5' cap and a poly-A tail to the pre-mRNA chain, followed by splicing. Alternative splicing occurs when appropriate, increasing the diversity of the proteins that any single mRNA can produce. The product of the entire transcription process (that began with the production of the pre-mRNA chain) is a mature mRNA chain.
Sources: en.wikipedia.org
The New York Times criticized Trump and his Republican allies' promotion of the bill, finding they made multiple false and misleading statements about the bill's impacts with inaccurate claims. It also described it as filled with "a series of novel, populist and temporary cuts that Mr. Trump cooked up during the 2024 campaign to try to win the support of key constituencies" and that it was ultimately an "apotheosis of a traditionally conservative, supply-side philosophy". It described it as "generating little additional economic growth and still returning the largest savings to the rich". It interviewed several conservative tax experts and former Republican aides who described it as "incoherent" and clinging to a traditional Republican economic agenda, only partially offering more temporary benefits to the working class paid for by cutting Medicaid and federal food assistance and refusing to raise taxes on the rich.
=== Mammals === Bats are not blind. While about 70% of bat species, mainly in the microbat family, use echolocation to navigate, all bat species have eyes and are capable of sight. In addition, almost all bats in the megabat or fruit bat family cannot echolocate and have excellent night vision. Bulls are not enraged by the color red, used in capes by professional bullfighters. Cattle are dichromats, so red does not stand out as a bright color. It is not the color of the cape, but the perceived threat by the bullfighter that incites it to charge, along with the spearing of the bull, mental agitation and abuse it endures beforehand. Camels do not store water in their humps, but rather fatty tissue which can be used as a reserve source of calories. While they can go long periods without water, the water is stored in the animal's bloodstream, not their humps. Domestic cats' behavioral and personality traits cannot be predicted from their coat color. Rather, these traits depend on a complex interplay between genetic and environmental factors. Not all cats are attracted and intoxicated by catnip, which affects only about two thirds of them. Alternatives exist, such as valerian root and leaves. Dogs do not sweat by salivating. Dogs actually do have sweat glands, but not on their tongues; they sweat mainly through their footpads. However, dogs do primarily regulate their body temperature through panting. (See also: Dog anatomy § Temperature regulation) Dogs do not consistently age seven times as quickly as humans.
==== Non-arising ==== Some Mahāyāna sūtras contain statements which speak of the "unarisen" or "unproduced" (anutpāda) nature of dharmas. According to Edward Conze, in the Prajñāpāramitā sutras, the ontological status of dharmas can be described as having never been produced (anutpāda), as never been brought forth (anabhinirvritti), as well as unborn (ajata). This is illustrated through various similies such as a dream, an illusion and a mirage. Conze also states that the "patient acceptance of the non-arising of dharmas" (anutpattika-dharmakshanti) is "one of the most distinctive virtues of the Mahāyānistic saint."
Like agonists, inverse agonists have their own unique ways of inducing pharmacological and physiological responses depending on many factors, such as the type of inverse agonist, the type of receptor, mutants of receptors, binding affinities and whether the effects are exerted acutely or chronically based on receptor population density. Because of this, they exhibit a spectrum of activity below the Intrinsic activity level. Changes in constitutive activity of receptors affect response levels from ligands like inverse agonists. To illustrate, mechanistic models have been made for how inverse agonists induce their responses on G protein-coupled receptors (GPCRs). Many types of Inverse agonists for GPCRs have been shown to exhibit the following conventionally accepted mechanism. Based on the Extended Ternary complex model, the mechanism contends that inverse agonists switch the receptor from an active state to an inactive state by undergoing conformational changes. Under this model, current thinking is that the GPCRs can exist in a continuum of active and inactive states when no ligand is present. Inverse agonists stabilize the inactive states, thereby suppressing agonist-independent activity. However, the implementation of 'constitutively active mutants' of GPCRs change their intrinsic activity. Thus, the effect an inverse agonist has on a receptor depends on the basal activity of the receptor, assuming the inverse agonist has the same binding affinity (as shown in the figure 2).
Sources: en.wikipedia.org
It is a synthetic cyclic heptapeptide and a non-selective melanocortin receptor agonist. Structurally it is modelled on alpha-melanocyte-stimulating hormone, a peptide that occurs naturally in the body.
Activation of MC1R increases pigment synthesis independently of ultraviolet exposure, which is the mechanism usually cited for darkening without sun exposure. Ultraviolet light still influences skin response through separate biological pathways.
Because the peptide binds several melanocortin receptor subtypes, its effects are not confined to pigmentation. This complicates interpretation of both intended and unintended outcomes reported in studies.
It is a synthetic seven-amino-acid peptide modeled on alpha-melanocyte-stimulating hormone. It carries two non-natural substitutions and a cyclic bridge that increase its stability relative to the natural hormone. It circulates as a research chemical and is not an approved medicine.