Everything below concerns circadian clock. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-08-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
SR9009 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
SR9009 is often grouped with compounds studied for circadian and metabolic regulation rather than with classical anabolic steroids. Its interactions with nuclear receptors differ from those of androgen receptor ligands, and its proposed mechanisms involve transcriptional control rather than direct hormone signaling. Some sources classify it as a metabolic modulator because of observed effects on energy utilization. The distinction matters for regulation and for interpreting research results across different compound classes.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
| Property | Value | Notes |
|---|---|---|
| Synonyms | SR9009; Stenabolic | Stenabolic is an informal name |
| Common form | Crystalline powder | Supplied in milligram to gram quantities |
| Long-term storage | -20 °C, desiccated, protected from light | Reduces degradation |
| Detection technique | LC-MS/MS | Common in anti-doping and research analysis |
| Regulatory status | Prohibited in sport by WADA | Not approved for human therapeutic use |
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not a steroid, peptide, or natural hormone. In scientific literature, it appears under the code SR9009 and in non-scientific contexts as Stenabolic. The compound was identified through chemical screening efforts aimed at targeting circadian clock components. Its status remains investigational, and no regulatory agency has approved it as a human medicine.
== External links == The MEROPS online database for peptidases and their inhibitors: A01.007[link removed] Renin at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Overview of all the structural information available in the PDB for UniProt: P00797 (Renin) at the PDBe-KB.
=== Pregnancy === Ketoconazole is categorized as pregnancy category C (Risk not ruled out) in the US. Research in animals has shown it to cause teratogenesis when administered in high doses. A subsequent trial in Europe failed to show a risk to infants of mothers receiving ketoconazole.
Caffeine (stylised CAFFEINE; formerly Coffee Inn and Caffeine Roasters) is a coffeehouse chain headquartered in Vilnius, Lithuania. Founded in 2007, it is the largest branded coffee chain in the Baltic states, operating more than 100 cafés in Lithuania and additional stores in Latvia, Estonia, Norway and Denmark.
Bone grafting is possible because bone tissue, unlike most other tissues, has the ability to regenerate completely if provided the space into which to grow. As native bone grows, it will generally replace the graft material completely, resulting in a fully integrated region of new bone. The biologic mechanisms that provide a rationale for bone grafting are osteoconduction, osteoinduction and osteogenesis.
==== Medical records ==== Police searches of Letby's home recovered sensitive medical documents, including nursing handover sheets, resuscitation records and blood‑gas printouts. A total of 257 sheets were found, 21 of which related to infants she was later accused of harming. Letby told the court that she often forgot to remove paperwork from her pockets after shifts and described herself as someone who "collect[ed] paper". She also said she had been unable to destroy the documents, although a paper shredder was found in her home.
Sources: en.wikipedia.org
=== Canada === During his visit to North America in August 1941, Howard Florey approached the Connaught Laboratories at the University of Toronto, where he met with the director, R. D. Defries, and Ronald Hare. Florey was rebuffed; Defries argued that the laboratories did not have the space, and he expressed his belief that constructing facilities to culture penicillin would be a waste as it would soon be synthesised. The results of clinical trials caused a change of heart, and in August 1943 the Canadian government asked the Connaught Laboratories to initiate mass production of penicillin. The Spadina Building was purchased by the University of Toronto for the purpose, and refurbished at a cost of Canadian $1.2 million (equivalent to Canadian $22 million in 2025), split equally between the university and the government. Penicillin was initially cultured in 200,000 bottles occupying 740 square metres (8,000 sq ft) of air-conditioned laboratory space. Production was switched to the deep submergence method in November 1945.
The compressional wave solutions used in the electromagnetic cloaking are transferred to material fluidic solutions where fluid motion is parallel to the wavevector. The computations then show that coordinate transformations can be applied to acoustic media when restricted to normal incidence in two dimensions. Next, the electromagnetic cloaking shell is referenced as an exact equivalence for a simulated demonstration of the acoustic cloaking shell. Bulk modulus and mass density determine the spatial dimensions of the cloak, which can bend any incident wave around the center of the shell. In a simulation with perfect conditions, because it is easier to demonstrate the principles involved, there is zero scattering in any direction.
Besides economic and social costs to implement anti–money-laundering laws, improper attention to data protection practices may entail disproportionate costs to individual privacy rights. In June 2011, the data-protection advisory committee to the European Union issued a report on data protection issues related to the prevention of money laundering and terrorist financing, which identified numerous transgressions against the established legal framework on privacy and data protection. The report made recommendations on how to address money laundering and terrorist financing in ways that safeguard personal privacy rights and data protection laws. In the United States, groups such as the American Civil Liberties Union have expressed concern that money laundering rules require banks to report on their own customers, essentially conscripting private businesses "into agents of the surveillance state".
In 1877 at Hooghly (near Kolkata), Herschel instituted the use of fingerprints on contracts and deeds, and he registered government pensioners' fingerprints to prevent the collection of money by relatives after a pensioner's death. In 1880, Henry Faulds, a Scottish surgeon in a Tokyo hospital, published his first paper on the subject in the scientific journal Nature, discussing the usefulness of fingerprints for identification and proposing a method to record them with printing ink. He established their first classification and was also the first to identify fingerprints left on a vial. Returning to the UK in 1886, he offered the concept to the Metropolitan Police in London, but it was dismissed at that time. Faulds wrote to Charles Darwin with a description of his method, but, too old and ill to work on it, Darwin gave the information to his cousin, Francis Galton, who was interested in anthropology. Having been thus inspired to study fingerprints for ten years, Galton published a detailed statistical model of fingerprint analysis and identification and encouraged its use in forensic science in his book Finger Prints. He had calculated that the chance of a "false positive" (two different individuals having the same fingerprints) was about 1 in 64 billion.
Valve Corporation, also known as Valve Software, is an American video game developer, publisher, hardware, and digital distribution company headquartered in Bellevue, Washington. It is the developer of game franchises including Half-Life, Counter-Strike, Portal, Team Fortress, Left 4 Dead and Dota, the software service Steam, and hardware including the Steam Frame, Steam Machine, Steam Deck and Valve Index. Valve was founded in 1996 by former Microsoft employees Gabe Newell and Mike Harrington. Their debut game, the first-person shooter (FPS) Half-Life (1998), was a critical and commercial success that had a lasting influence on the genre. Harrington left in 2000. In 2003, Valve launched Steam, followed by Half-Life 2 (2004), the episodic sequels Half-Life 2: Episode One (2006) and Episode Two (2007), the puzzle games Portal (2007) and Portal 2 (2011), and the multiplayer games Team Fortress 2 (2007), Left 4 Dead (2008), and Dota 2 (2013). During the 2010s, Valve released fewer games and focused on hardware and virtual reality (VR). They released the first Steam Machine console in 2015, the Valve Index VR headset in 2019, their flagship VR game, Half-Life: Alyx, in 2020, and the handheld system Steam Deck in 2022. In 2026, Valve released a redesigned Steam Machine and a standalone VR headset, the Steam Frame. Valve uses a flat organizational structure, allowing employees to choose their own projects. Valve is noted for its technical and artistic innovation, with many of its games receiving mention among the greatest games of all time.
Sources: en.wikipedia.org
== Regulation of gonadotropic cells == Gonadotroph release of gonadotropins is highly regulated and fluctuates with physiological conditions. For example, in the presence of gonadotropins, ovaries produce and secrete the hormone estradiol. Increased levels of estradiol regulate the surge in LH levels through a negative feedback mechanism during the mid-cycle of the menstrual cycle. This indicates that LH released from gonadotrophs stimulates the production of estradiol; however, when there is a drastic increase in estradiol production, estradiol will regulate LH production by preventing gonadotrophs from releasing more LH until estradiol is needed again. In males, LH stimulates the production of testosterone by Leydig cells in testis and FSH controls spermatogenesis. Testosterone will also provide negative feedback to gonadotrophs and regulate its own production by acting on the hypothalamus and anterior pituitary. The negative feedback provided by these sex steroids (estradiol and testosterone) lead to the inhibition of hypothalamic secretion of GnRH, which consequently will inhibit the release of LH from gonadotropic cells. FSH is selectively inhibited by paracrine factors, such as inhibin. Inhibin A is secreted from ovarian granulosa cells in females, and inhibin B is secreted by testicular Sertoli cells in males. Similar to the negative feedback of the sex steroids, the inhibin will provide feedback to the pituitary gonadotrophs to reduce secretion of FSH by inhibiting GnRH from activating the release of gonadotropins.
Both provinces of Negros are interconnected by major inter-provincial roads. In Bacolod, there are two main roads, namely Lacson Street to the north and Araneta Street to the south. Cities, especially the provincial capitals of Bacolod and Dumaguete, are being served by jeepneys and taxis. Tricycles are mainly used for short-distance travel, and is common in city barangays, smaller cities and towns. Bus stations are present in major cities and towns within the region. Vallacar Transit Corporation, which operates the Ceres buses, serves the whole island of Negros. There are regularly scheduled fast ferry and roll-on/roll-off services for the island region's coastal cities and towns.
== Functions and requirement == The Food and Nutrition Board (FNB) of the U.S. Institute of Medicine has set Recommended Dietary Allowances (RDAs) for essential amino acids in 2002. For adults 19 years and older, 19 mg of isoleucine/kg body weight is required daily. Beside its biological role as a nutrient, isoleucine also participates in regulation of glucose metabolism. Isoleucine is an essential component of many proteins. As an essential amino acid, isoleucine must be ingested or protein production in the cell will be disrupted. Fetal hemoglobin is one of the many proteins that require isoleucine. Isoleucine is present in the gamma chain of fetal hemoglobin and must be present for the protein to form. Genetic diseases can change the consumption requirements of isoleucine. Amino acids cannot be stored in the body. Buildup of excess amino acids will cause a buildup of toxic molecules so, humans have many pathways to degrade each amino acid when the need for protein synthesis has been met. Mutations in isoleucine-degrading enzymes can lead to dangerous buildup of isoleucine and its toxic derivative. One example is maple syrup urine disease (MSUD), a disorder that leaves people unable to breakdown isoleucine, valine, and leucine. People with MSUD manage their disease by a reduced intake of all three of those amino acids alongside drugs that help excrete built-up toxins. Many animals and plants are dietary sources of isoleucine as a component of proteins. Foods that have high amounts of isoleucine include eggs, soy protein, seaweed, turkey, chicken, lamb, cheese, and fish.
The draw took place on December 5, 2025, at the Kennedy Center in Washington, D.C. The draw ceremony began with FIFA presenting the first FIFA Peace Prize to Donald Trump, an award which fueled scrutiny and ridicule among human rights groups, analysts, and others. The 48 teams were divided into four pots of 12. Pot 1 consisted of the three hosts and the top nine teams from the November 2025 FIFA Men's World Ranking. Pots 2, 3, and 4 consisted of the remaining teams according to the ranking. The four winners of the UEFA playoffs and the two winners of the inter-confederation playoffs were not known at the time of the draw and thus were automatically allocated to Pot 4. The 12 groups were randomly formed by selecting one team from each of the four pots. With the exception of UEFA, no group could have more than one team from the same confederation drawn into it. The three host nations were pre-allocated to three groups for scheduling purposes. Mexico was placed in Group A, Canada in Group B, and the United States in Group D. The confederation restriction applied to all three potential winners of the inter-confederation playoffs. FIFA also announced that, "in the interest of ensuring competitive balance", the teams ranked first (Spain), second (Argentina), third (France), and fourth (England) would be drawn into opposite pathways. Therefore, should these teams win their groups, they would be unable to meet until the semifinals, and the first and second ranked teams would be unable to meet until the final.
Sources: en.wikipedia.org
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.
Research-grade purity indicates a supplier's measured percentage of the intended compound. It does not guarantee safety, sterility, or suitability for human consumption. Buyers should request a certificate of analysis with chromatograms and test methods.
Sports regulators prohibit SR9009 because it is a non-approved substance with potential performance-altering effects. Its presence can be detected in anti-doping testing. Athletes are responsible for substances found in their samples.
It is a synthetic REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.