This is a working overview of NR1D1, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-03-21. Anything still debated is marked as such rather than presented as settled.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, dark | Protect from repeated temperature changes. |
| Common analytical method | LC-MS or HPLC-UV | Reference standard required for comparison. |
| Common synonyms | SR9009; Stenabolic; REV-ERB agonist | Vendor naming may vary. |
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
REV-ERB proteins typically suppress gene expression by recruiting corepressor complexes to DNA response elements. SR9009 binds these receptors and strengthens that repressive action in cell-based assays. Studies in rodents have reported changes in lipid handling, mitochondrial function, and exercise capacity after treatment. Such findings are often cited as evidence for metabolic effects, but species differences and limited pharmacokinetic data make direct translation to humans uncertain. Researchers continue to examine which effects are robust and which depend on specific experimental conditions.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
Epididymis evolution from reptiles to mammals Epididymal hypertension – Condition that arises during human sexual arousal when seminal fluid is not ejaculatedPages displaying short descriptions of redirect targets List of distinct cell types in the adult human body
TSAVLQ-SGFRK-NH2 and SGVTFQ-GKFKK are the two peptides corresponding to the two self-cleavage sites of the SARS 3C-like proteinase The protease is important in the processing of the coronavirus replicase polyprotein (P0C6U8). It is the main protease in coronaviruses and corresponds to nonstructural protein 5 (nsp5). It cleaves the coronavirus polyprotein at 11 conserved sites. The 3CL protease has a cysteine-histidine catalytic dyad at its active site. The sulfur of the cysteine acts as a nucleophile and the imidazole ring of the histidine as a general base.
=== In antiquity === Emperor Ashoka, who ruled the Maurya Empire in the Indian subcontinent from 269 to 232 BCE, abolished the slave trade but not slavery. The Qin dynasty, which ruled China from 221 to 206 BCE, abolished slavery and discouraged serfdom. However, many of its laws were overturned when the dynasty was overthrown. Slavery was again abolished by Wang Mang in China in 17 CE but was reinstituted after his assassination.
Autologous (or autogenous) bone grafting involves utilizing bone obtained from the same individual receiving the graft. Bone can be harvested from non-essential bones, such as from the iliac crest, or more commonly in oral and maxillofacial surgery, from the mandibular symphysis (chin area) or anterior mandibular ramus (the coronoid process); this is particularly true for block grafts, in which a small block of bone is placed whole in the area being grafted. When a block graft will be performed, autogenous bone is the most preferred because there is less risk of the graft rejection because the graft originated from the patient's own body. As indicated in the chart above, such a graft would be osteoinductive and osteogenic, as well as osteoconductive. A negative aspect of autologous grafts is that an additional surgical site is required, in effect adding another potential location for post-operative pain and complications. Autologous bone is typically harvested from intra-oral sources as the chin or extra-oral sources as the iliac crest, the fibula, the ribs, the mandible and even parts of the skull. All bone requires a blood supply in the transplanted site. Depending on where the transplant site is and the size of the graft, an additional blood supply may be required. For these types of grafts, extraction of the part of the periosteum and accompanying blood vessels along with donor bone is required. This kind of graft is known as a vital bone graft.
Sources: en.wikipedia.org
At the adult stage, a teleost is able to produce viable gametes for reproduction. Like many fish, teleosts continue to grow throughout their lives. Longevity depends on the species with some gamefish like European perch and largemouth bass living up to 25 years. Rockfish appear to be the longest living teleosts with some species living over 100 years.
=== Diminished sensitivity, associated with diabetes risk === Although many factors influence insulin secretion, the most important control is the amount of glucose moving from the blood into the beta cells of the pancreas. In healthy people, even small rises in blood glucose result in increased insulin secretion. As long as the pancreatic beta cells are able to sense the glucose level and produce insulin, the amount of insulin secreted is usually the amount required to maintain a fasting blood glucose between 70 and 100 mg/dL (3.9–5.6 mmol/L) and a non-fasting glucose level below 140 mg/dL (<7.8 mmol/L). When liver cells and other cells that remove glucose from the blood become less sensitive (more resistant) to the insulin, the pancreas increases secretion and the level of insulin in the blood rises. This increased secretion can compensate for reduced sensitivity for many years, with maintenance of normal glucose levels. However, if insulin resistance worsens or insulin secretion ability declines, the glucose levels will begin to rise. Persistent elevation of glucose levels is termed diabetes mellitus. Typical fasting insulin levels found in this type of hyperinsulinism are above 20 μU/mL. When resistance is severe, levels can exceed 100 μU/mL. In addition to being a risk factor for type 2 diabetes, hyperinsulinism due to insulin resistance may increase blood pressure and contribute to hypertension by direct action on vascular endothelial cells (the cells lining blood vessels).
=== Strain-promoted alkyne-nitrone cycloaddition (SPANC) === Diaryl-strained-cyclooctynes including dibenzylcyclooctyne (DIBO) have also been used to react with 1,3-nitrones in strain-promoted alkyne-nitrone cycloadditions (SPANC) to yield N-alkylated isoxazolines.
Clinton. In October 2002 at the International Symposium on Chromatography in London, Klaus Mosbach was presented the Martin Gold Medal, at the Royal Society, for the year 2000, by the Executive Committee of the Chromatographic Society. It was awarded him "in recognition of his major contributions to the field of separation science over many years". Previous recipients of this award are inter alia F. Regnier (1993), C. Horvath (1994) and W.H. Pirkle (1990). Mosbach published more than 537 peer reviewed scientific articles and reviews with an H-Index of 77. Mosbach wrote and edited four volumes of methods in enzymology series on Immobilized Enzymes, by Academic press (44,132,133,134). In addition he has received and applied for 84 patents.
The biliary tract is derived from the branches of the bile ducts. The biliary tract, also known as the biliary tree, is the path by which bile is secreted by the liver then transported to the first part of the small intestine, the duodenum. The bile produced in the liver is collected in bile canaliculi, small grooves between the faces of adjacent hepatocytes. The canaliculi radiate to the edge of the liver lobule, where they merge to form bile ducts. Within the liver, these ducts are termed intrahepatic bile ducts, and once they exit the liver, they are considered extrahepatic. The intrahepatic ducts eventually drain into the right and left hepatic ducts, which exit the liver at the transverse fissure, and merge to form the common hepatic duct. The cystic duct from the gallbladder joins with the common hepatic duct to form the common bile duct. The biliary system and connective tissue is supplied by the hepatic artery alone. Bile either drains directly into the duodenum via the common bile duct, or is temporarily stored in the gallbladder via the cystic duct. The common bile duct and the pancreatic duct enter the second part of the duodenum together at the hepatopancreatic ampulla, also known as the ampulla of Vater.
Sources: en.wikipedia.org
By 1945 she had succeeded in identifying the structure of vitamin B12, describing the arrangement of its atoms in three dimensions. In 1947, she was elected a Fellow of the Royal Society (FRS) In 1958, she was elected a Foreign Honorary Member of the American Academy of Arts and Sciences. Hodgkin won the 1964 Nobel Prize in Chemistry, and is the only British woman scientist to have been awarded a Nobel Prize in any of the three sciences it recognizes. In 1965 she was appointed to the Order of Merit. She was the second woman to receive the Order. In 1966, she was awarded the Iota Sigma Pi National Honorary Member for her significant contribution. In 1970, gained EMBO Membership. She became a foreign member of the USSR Academy of Sciences in the 1970s. In 1976, she was the first woman to receive the prestigious Copley Medal. Hodgkin was Chancellor of the University of Bristol from 1970 to 1988. In 1978, she was given an honorary Degree of Science from University of Bath. In 1981, she was awarded the Dalton Medal from the Manchester Literary and Philosophical Society In 1982 she received the Lomonosov Medal of the Soviet Academy of Sciences. In 1987 she accepted the Lenin Peace Prize from the government of Mikhail Gorbachev. In 1983, Hodgkin received the Austrian Decoration for Science and Art. In 1993, an asteroid (5422) discovered on 23 December 1982 by L.G. Karachkina (at the Crimean Astrophysical Observatory, M.P.C. 22509, in the USSR) was named "Hodgkin" in her honour.
On 16 September 1994, the 82nd Airborne Division joined Operation Uphold Democracy. The 82nd was scheduled to make combat parachute jumps into Pegasus Drop Zone and PAPIAP Drop Zone (Port-au-Prince Airport), to help oust Raoul Cédras and to restore Jean-Bertrand Aristide to the presidency. At the same time, former US president Jimmy Carter and former chairman of the Joint Chiefs of Staff Colin Powell were negotiating with Cédras to restore Aristide to power, the 82nd's first wave was in the air, with paratroopers waiting at Green Ramp to air-land in Haïti once the airfields there had been seized. When the Haitian military verified from sources outside Pope Air Force Base that the 82nd was on the way, Cédras stepped down, averting the invasion. Former vice president Al Gore later travelled to Fort Bragg to personally thank the paratroopers of the 82nd for their actions, noting in a speech on 19 September 1994, that the 82nd's reputation was enough to change Cédras' mind:
== Additional Union Carbide actions == The corporation denied the claim that valves on the tank were malfunctioning and claimed that documented evidence gathered after the accident showed the valve closest to the plant's water-washing operation was closed and leak-tight. Furthermore, process safety systems had prevented water from entering the tank by accident. Carbide states that all safety concerns identified in 1982 were allayed before 1984 and had nothing to do with the accident. The company admitted that safety systems in place would not have been able to prevent a chemical reaction of such magnitude from causing a leak. According to Carbide, "in designing the plant's safety systems, a chemical reaction of this magnitude was not factored in" because "the tank's gas storage system was designed to automatically prevent such a large amount of water from being inadvertently introduced into the system" and "process safety systems—in place and operational—would have prevented water from entering the tank by accident". Instead, they claim that "employee sabotage—not faulty design or operation—was the cause of the tragedy". Tactical response The company stresses the immediate action taken after the disaster and its continued commitment to helping the victims. On 4 December, the day following the leak, Union Carbide sent material aid and several international medical experts to assist the medical facilities in Bhopal.
Bin Laden's 1996 fatwa, in addition to similar statements that called for the killing of Americans, are seen by investigators as evidence of his motivation for the attacks. In a second fatwa in 1998, he outlined more of his objections to American foreign policy, such as American support of Israel and the U.S. and other nations' sanctions against Iraq, condemning the "protracted blockade." He claimed that the U.S. was being directed by an international Jewish conspiracy into killing as many Muslims as possible, and that all Muslims must wage a defensive war against the U.S. This was to be done until the aggression against them ceased. Bin Laden further claimed it would send a message to the American people, forcing the U.S. to reevaluate its policies. In a 1998 interview with American journalist John Miller, he stated:
Sources: en.wikipedia.org
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.
The solid is usually kept desiccated at -20 °C or lower and protected from light. Stock solutions are aliquoted to limit freeze–thaw cycles. Aqueous solutions are not generally recommended for long-term storage.
Laws differ by country and by intended use. It is not an approved medicine, and many vendors sell it as a research chemical. Purchasers are responsible for confirming local restrictions.
It is a synthetic compound studied as an agonist of REV-ERB nuclear receptors. It is not an approved medicine and has mainly been examined in laboratory and animal research.