The short version of FSFI desire score fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-08-14. Anything still debated is marked as such rather than presented as settled.
Bremelanotide is a cyclic heptapeptide that binds several melanocortin receptors rather than one. In vitro assays report agonist activity at MC1R, MC3R, MC4R and MC5R, with MC4R generally treated as the subtype most relevant to sexual effects. MC4R is expressed in hypothalamic nuclei involved in appetite, energy balance and motivated behaviour, which provides a plausible route for central action. Selective MC4R agonists studied in animals produce comparable behavioural changes, supporting that interpretation.
How receptor activation translates into a change in desire is not established in detail. Proposed steps include modulation of dopaminergic signalling in reward circuits and downstream effects on autonomic tone. Human data consist mainly of clinical trials measuring self-reported outcomes rather than direct measurements of brain activity or transmitter release. The transient rise in blood pressure sometimes observed after administration is likewise reported consistently but explained only partly by known melanocortin pathways.
Melanocortin receptors form a family of five G-protein-coupled proteins, labelled MC1R through MC5R, that respond to peptides derived from pro-opiomelanocortin. Alpha-melanocyte-stimulating hormone and adrenocorticotropic hormone are the best-known endogenous ligands. The receptors are distributed differently across tissues, so a single agonist can produce effects in the brain, skin, adrenal gland and vasculature. This distribution explains why one peptide can influence both pigmentation and motivated behaviour.
Handling procedures emphasize minimizing moisture uptake, since the dried solid is hygroscopic and can draw water when warmed to room temperature before a vial is opened. Laboratories record lot number, purity, counter-ion content, and residual solvent data supplied by the producer. Impurity profiles are compared run to run, and any shift in retention time or peak shape prompts re-verification against a reference standard. Certificates of analysis are treated as claims to be checked rather than accepted at face value.
Identity and purity testing for this peptide typically relies on reversed-phase high-performance liquid chromatography with ultraviolet detection, reported as area-percent purity. Mass spectrometry, usually in tandem mode, confirms molecular mass and supports quantification in biological matrices. Sequence confirmation may use peptide mapping after enzymatic digestion, while nuclear magnetic resonance and circular dichroism supply supplementary structural detail. No single technique establishes identity alone, so laboratories compare retention time, mass, and fragment pattern against a verified reference standard.
| Property | Value | Notes |
|---|---|---|
| Primary receptor target | MC4R agonist | Subtype most often linked to behavioural effects |
| Other reported targets | MC1R, MC3R, MC5R | Activity is not selective for a single subtype |
| Endogenous ligand class | Melanocortin peptides | Alpha-MSH and ACTH act on the same family |
| Peptide architecture | Cyclic heptapeptide | Lactam bridge between the aspartate and lysine residues |
| Central action | Inferred from animal models | Not directly measured in the human brain |
Development of the peptide passed through several delivery formats, including an intranasal version tested in early trials and an injectable version that entered later clinical study. Regulatory approval for a subcutaneous product in the United States was granted in 2019 after review of controlled trials in premenopausal women. Outside the clinic, the compound circulates in research and non-pharmaceutical markets under its code name, where identity and purity vary considerably between suppliers. Synonyms appearing across technical literature include bremelanotide, PT-141, and Palatin 141.
PT-141 is the research designation for bremelanotide, a synthetic cyclic heptapeptide developed as a melanocortin receptor agonist. The peptide contains seven amino acids with an internal lactam bridge that constrains the backbone into a stable ring. Cyclisation of this kind improves resistance to enzymatic degradation relative to linear analogues. The compound was first explored for effects on melanin production, because several melanocortin receptors influence pigmentation. Its later association with sexual desire emerged from observations made during that early work, and the molecule became the subject of a separate development programme.
Across literature and commercial listings, the substance appears under several names, including bremelanotide, PT-141, and various brand designations. A CAS registry number provides a unique identifier for the compound, aiding retrieval from chemical databases. Synonym lists may also contain early development codes and descriptive chemical names. When consulting sources, researchers need to confirm that the cited names refer to the same molecular structure to avoid confusion. Naming consistency matters especially when comparing analytical data across publications.
PT-141 is a synthetic cyclic heptapeptide whose development code is bremelanotide. It belongs to the class of melanocortin receptor agonists and acts by mimicking endogenous peptide hormones. The compound originated from research on melanotan II, where investigators exploring derivatives found distinct pharmacological features. Unlike the parent compound, PT-141 showed effects on pathways related to sexual desire and function in early studies, prompting its development as a separate candidate. Its molecular design aimed to separate receptor activity from pigmentary effects.
The molecular backbone consists of seven amino acid residues joined into a ring through a disulfide bridge. This cyclic conformation is critical for receptor binding. The sequence includes an acetylated N-terminus and an amidated C-terminus, modifications that improve resistance to enzymatic breakdown. One residue is in the D-configuration, a feature that further stabilizes the peptide against protease activity. Together, the ring structure and specific stereochemistry determine selectivity among melanocortin receptor subtypes.
Clinical research typically uses randomised, double-blind, placebo-controlled designs. The most common primary endpoint is the desire domain score of the Female Sexual Function Index, sometimes paired with a distress measure. Secondary outcomes include arousal, satisfaction, and event-based counts of satisfying sexual episodes. Across trials, average improvements are modest and individual responses vary widely. Whether benefits persist beyond a few months, and whether they depend on baseline hormone status, remain open questions rather than settled findings.
Melanocortin receptors form a family of five G-protein-coupled receptors designated MC1 through MC5. Bremelanotide binds most strongly at MC4R and MC1R, with weaker activity reported at MC3R and MC5R. MC4R is expressed in hypothalamic nuclei that coordinate energy balance and aspects of sexual behaviour. The prevailing interpretation is that central MC4R activation, rather than peripheral vascular effects alone, drives the reported changes in desire. This account remains partly inferential, since direct receptor-level measurement in living humans is not practical.
After subcutaneous administration, plasma concentrations rise within roughly thirty minutes and the elimination half-life is short, on the order of two to three hours. Reported physiological responses include transient increases in blood pressure and nausea, which tended to diminish with repeated dosing in trial settings. Because the peptide clears quickly, effects are not expected to persist long after a dose. Absorption from non-injected routes is poorly characterised, and nasal delivery produced variable plasma levels in older work.
Bremelanotide acts as a non-selective agonist at melanocortin receptors, with reported activity at MC1R, MC3R, MC4R and MC5R. The proposed basis for its central effects is activation of MC4R populations in the hypothalamus, a region associated with appetite and reproductive signalling. Because the peptide carries a net positive charge and polar side chains, it does not cross biological membranes freely, which is one reason oral administration is not the standard route. Effects generally appear within an hour of parenteral administration and are described as centrally mediated rather than peripheral.
Bremelanotide, developed under the code PT-141, is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone. Its structure is Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH, with a lactam bridge joining the aspartate and lysine side chains. The molecule has the formula C50H68N14O10 and a monoisotopic mass near 1025 daltons. It is commonly prepared as the acetate salt and appears as a white to off-white lyophilised powder in solid form. The free acid is the pharmacologically relevant species, while the counter-ion improves handling and dissolution.
Early research on PT-141 grew out of work on melanotan II, a related cyclic peptide studied for pigmentation. Investigators observed that centrally acting melanocortin agonists also influenced sexual behaviour in animal models, and the programme shifted toward that endpoint. A nasal formulation was evaluated in clinical trials but showed inconsistent absorption, and later studies used subcutaneous administration instead. Regulatory approval in the United States followed in 2019 for a defined population of premenopausal women with acquired, generalised hypoactive sexual desire disorder. That approval was specific to that group rather than a broad indication.
King Crimson toured in 2003 to support the album; recordings from it were used for the live album EleKtrik: Live in Japan. 2003 also saw the release of the DVD Eyes Wide Open, a compilation of the band's shows Live at the Shepherds Bush Empire (London, 3 July 2000) and Live in Japan (Tokyo, 16 April 2003). In November 2003, Gunn left the group to pursue solo projects and was replaced by Levin. The band reconvened in early 2004 for rehearsals, but nothing developed from these sessions; they then went on another hiatus. At this point, Fripp was publicly reassessing his desire to work within the music industry, often citing the unsympathetic aspects of the life of a touring musician, such as "the illusion of intimacy with celebrities". Two retrospective box sets, The 21st Century Guide to King Crimson Volume One 1969–1974 and The 21st Century Guide to King Crimson Volume Two 1981–2003, were issued in 2004 and 2005 respectively. On 21 September 2006, former King Crimson member Boz Burrell died of a heart attack, followed by another former member, Ian Wallace, who died of esophageal cancer on 22 February 2007.
Tea was first introduced to Western priests and merchants in China during the 16th century, at which time it was termed chá. The earliest European reference to tea, written as chiai, came from Delle navigationi e viaggi written by Venetian Giambattista Ramusio in 1545. The first recorded shipment of tea by a European nation was in 1607 when the Dutch East India Company moved a cargo of tea from Macao to Java, then two years later, the Dutch bought the first assignment of tea which was from Hirado in Japan to be shipped to Europe. Tea became a fashionable drink in The Hague in the Netherlands, and the Dutch introduced the drink to Germany, France, and across the Atlantic to New Amsterdam (New York). In 1567, Russian people came in contact with tea when Cossack leaders (atamans) Petrov and Yalyshev visited China. The Mongolian Khan donated to Tsar Michael I four poods (65–70 kg) of tea in 1638. According to Jeremiah Curtin, it was possibly in 1636 that Vassili Starkov was sent as envoy to the Altyn Khan. He was given 250 pounds of tea as a gift to the tsar. Starkov at first refused, seeing no use for a load of dead leaves, but the Khan insisted. Thus was tea introduced to Russia. In 1679, Russia concluded a treaty on regular tea supplies from China via camel caravan in exchange for furs. It is today considered the de facto national beverage.
The New York State Agricultural Experiment Station recipe for the concentrate suggests starting with 80 lb of sulfur, 36 lb of quicklime, and 50 gal of water, equivalent to 19.172 kg of sulfur and 8.627 kg of calcium oxide per 100 liters of water. About 2.2:1 is the ratio (by weight) for compounding sulfur and quicklime; this ratio yields the highest proportion of calcium pentasulfide. If calcium hydroxide (builders' or hydrated lime) is used, an increase of one-third or more (to 115 g/L or more) may be used with the 192 g/L of sulfur. If the quicklime is 85%, 90%, or 95% pure, 101 g/L, 96 g/L, or 91 g/L is used, respectively; if impure hydrated lime is used, its quantity is increased to compensate, though in practice lime with a purity lower than 90% is rarely used. The mixture is then boiled for one hour while being stirred, and small amounts of water are added for evaporation.
== Synthesis == Like all bacterial extracellular proteases thermolysin is first synthesised by the bacterium as a pre-proenzyme. Thermolysin is synthesized as a pre-proenzyme consisting of a signal peptide 28 amino acids long, a pro-peptide 204 amino acids long and the mature enzyme itself 316 amino acids in length. The signal peptide acts as a signal for translocation of pre-prothermolysin to the bacterial cytoplasmic membrane. In the periplasm pre-prothermolysin is then processed into prothermolysin by a signal peptidase. The prosequence then acts as a molecular chaperone and leads to autocleavage of the peptide bond linking pro and mature sequences. The mature protein is then secreted into the extracellular medium.
Sanders attended high school with economist Walter Block. When he was 19, his mother died at age 47, following failed cardiac surgery. His father died two years later, in 1962, at age 57. Sanders studied at Brooklyn College for a year in 1959–1960 before transferring to the University of Chicago and graduating with a Bachelor of Arts degree in political science in 1964. In later interviews, Sanders described himself as a mediocre college student because the classroom was "boring and irrelevant" and said he viewed community activism as more important to his education.
Sources: en.wikipedia.org
the pantalon (long trousers) – in place of the culottes (silk knee-breeches) worn by the upper classes the carmagnole (short-skirted coat) sabots (a type of wooden clog), and the red Phrygian cap, also known as a "liberty cap"
=== Death === Ingestion of high quantities of capsaicin can be deadly, particularly in people with heart problems. Even healthy young people can suffer adverse health effects like myocardial infarction after ingestion of capsaicin capsules.
He attended college at University of California, Santa Cruz, for two years before transferring to New York University (NYU)'s Tisch School of the Arts, where he graduated in 2000. While at NYU, writer Murray Miller was his roommate.
=== By Palestinian militants === The IDF has accused Hamas of using child soldiers and of positioning children on the front lines. Israeli officials claim Hamas and Islamic Jihad had for years run summer camps in the Gaza Strip where children underwent military training. According to the Coordinator of Government Activities in the Territories, a unit of the Israeli Ministry of Defense, "a senior Hamas militant" said Hamas used children to transport explosives. Israel also claims Hamas sent over one hundred children and women to a compound the IDF was targeting to act as human shield in November 2023, that they had found entrances to multiple Hamas tunnels near and under children's beds during the war, and that children are used by Hamas to scout and observe the IDF forces, reporting activity, locations, and extent of the forces. Neve Gordon, professor of international law and human rights and co-author of the 2020 book Human Shields: A History of People in the Line of Fire, has stated that Israeli military and government claims of Hamas using Palestinian civilians as human shields "should be understood as a pre-emptive legal defence against accusations that Israel is committing war crimes and crimes against humanity in Gaza". Janina Dill, a laws of war professor at University of Oxford, stated, "Even if Hamas uses civilians as human shields, those civilians are entitled to full protection under international law unless they directly participate in the fighting".
== Other == Apical foramen, the hole at the tip of the root of a tooth Foramen ovale (heart), a hole between the venous and arterial sides of the fetal heart Transverse foramen, one of a pair of openings in each cervical vertebra, in which the vertebral artery travels Greater sciatic foramen, a major foramen of the pelvis Interventricular foramina, channels connecting ventricles in the brain Lesser sciatic foramen, an opening between the pelvis and the posterior thigh Obturator foramen, the hole created by the ischium and pubis bones of the pelvis Omental foramen, the connecting opening between the greater sac and the lesser sac in the abdominal cavity Sacral foramina, which perforate the vertebral canal from the Sacrum (sacral bone), and through which the sacral nerves pass Vertebral foramen, the foramen formed by the anterior segment (the body), and the posterior part, the vertebral arch Foramen of Panizza, a hole connecting two aortas just after they leave the heart in crocodiles
Sources: en.wikipedia.org
Diffuse midline glioma, H3 K27-altered (DMG) is a tumour that arises in midline structures of the brain, most commonly the brainstem, thalamus and spinal cord. When located in the pons it is also known as diffuse intrinsic pontine glioma (DIPG). DMG is believed to be caused by genetic mutations that cause epigenetic changes in cells of the developing nervous system, resulting in a failure of the cells to properly differentiate. Currently, the standard of care is fractionated external beam radiotherapy, as the tumour location precludes surgery, and chemotherapy has shown to be ineffective. However, the estimated survival post-diagnosis remains only 9–15 months. DMGs primarily affect children: the median age of diagnosis is around 6-7 years old. Current understanding has shown several genes are involved in the pathology of the glioma. The pathology is resistant to treatment, suggesting that a major driver is that cellular apoptosis mechanisms are disabled.
In the United States and Canada, cottage cheese is used in many culinary dishes. It can be combined with fruit and sugar, salt and pepper, fruit purée, tomatoes, or granola and cinnamon. It can be eaten on toast, in salads, as a chip dip, as a replacement for mayonnaise in tuna salad, and as an ingredient in recipes such as jello salad and various desserts. Cottage cheese is also consumed with fruit, such as pineapple, pears, peaches, or mandarin oranges. The sour taste of the product is due to lactic acid, which is present at 124–452 mg/kg. Formic, acetic, propionic and butyric acids contribute to the flavor and aroma. Due to its incorporation of whey, cottage cheese is high in lactose relative to most other cheeses. However, lactose is partially decomposed by lactic acid fermentation, and is mostly removed after washing the curds.
== Clinical significance == Melanoma - Cancer affecting melanocytes Melanocytic tumors Melanocytic tumors of uncertain malignant potential Vitiligo - Decreased number of melanocytes due to autoimmune destruction causing decreased melanin Albinism - Normal number of melanocytes, but decreased melanin production due to decreased tyrosinase activity or defective tyrosine transport Melasma (Chloasma) - Patchy hyperpigmentation of the skin Normal number of melanocytes with increased melanin production causing hyperpigmentation. Associated with pregnancy or oral contraceptive pill use. Addison disease Nevus depigmentosus
=== Education === A system of primary and secondary education existed albeit a racially segregated one with one being for non-African students (though intended to be just for white students) and one for African students. The education system in Rhodesia had issues with getting not just instructors but qualified ones. A sole university existed, the University of Rhodesia which was not racially segregated. It offered 3-year bachelor degrees and Doctor of Medicine degrees which could be completed in 6 years. A library system and a number of museums existed in Rhodesia as well.
Large deposits of iron are banded iron formations, a type of rock consisting of repeated thin layers of iron oxides alternating with bands of iron-poor shale and chert. The banded iron formations were laid down in the time between 3,700 million years ago and 1,800 million years ago. Materials containing finely ground iron(III) oxides or oxide-hydroxides, such as ochre, have been used as yellow, red, and brown pigments since pre-historical times. They contribute as well to the color of various rocks and clays, including entire geological formations like the Painted Hills in Oregon and the Buntsandstein ("colored sandstone", British Bunter). Through Eisensandstein (a jurassic 'iron sandstone', e.g. from Donzdorf in Germany) and Bath stone in the UK, iron compounds are responsible for the yellowish color of many historical buildings and sculptures. The proverbial red color of the surface of Mars is derived from an iron oxide-rich regolith. Significant amounts of iron occur in the iron sulfide mineral pyrite (FeS2), but it is difficult to extract iron from it and it is therefore not exploited. In fact, iron is so common that production generally focuses only on ores with very high quantities of it. According to the International Resource Panel's Metal Stocks in Society report, the global stock of iron in use in society is 2,200 kg per capita. More-developed countries differ in this respect from less-developed countries (7,000–14,000 vs 2,000 kg per capita).
Sources: en.wikipedia.org
Bremelanotide binds several melanocortin receptors, and MC4R is the subtype most often cited as responsible for its behavioural effects. Activity at MC1R, MC3R and MC5R is also reported. Selectivity is therefore described as limited rather than precise.
It is not classified as a vasodilator, and its proposed site of action is the central nervous system rather than peripheral vessels. Some trial participants show small transient blood pressure changes. Whether those changes arise centrally or through another route remains an open question.
Most evidence comes from animal models and from indirect human outcomes such as self-reported desire. Direct measurements of receptor occupancy or signalling in the human brain are not available. Published reviews therefore present a plausible pathway rather than a confirmed sequence of events.
Chemical degradation such as hydrolysis and oxidation proceeds more slowly as temperature falls. Cold storage also limits microbial growth in reconstituted material. Repeated warming should be avoided because thermal cycling stresses the peptide.