nuclear receptor comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-07-31. Numbers and descriptions here follow the published literature rather than marketing material.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
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, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Binds REV-ERBα and REV-ERBβ in preclinical models |
| Molecular formula | C20H24ClN3O4S | Reported for the parent compound |
| CAS Registry Number | 1379686-30-2 | Common identifier in chemical databases |
| Appearance | Off-white to pale yellow solid | Typical research chemical solid |
| Solubility | Soluble in DMSO and ethanol; low in water | Class: small organic molecule |
SR9009 is frequently discussed in fitness and research-chemical contexts, yet it has no approved medical indication. Regulatory agencies have not authorized it for human use, and it is not a standard prescription drug. Some sports organizations list it as a prohibited substance because of its potential performance-enhancing properties. Published human data are sparse, so claims about its effects in people often rely on animal models or anecdotal reports. Quality and identity of online materials can vary widely.
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
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.
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.
SR9009 is a synthetic small molecule that acts on the nuclear receptors REV-ERBα and REV-ERBβ. These receptors are part of the circadian clock machinery and normally repress transcription of certain target genes. In laboratory research, SR9009 is used as a chemical tool to study how REV-ERB activity influences metabolism, inflammation, and daily biological rhythms. The compound is not an approved medicine, and its effects in humans remain largely uncharacterized. It is often described as an investigational agent rather than a therapeutic product.
=== Modern day === Three hundred Tahitian volunteers fought in the European theatre of World War II with the Free French Forces. In the late 1960s and early 1970s Tahitian poets Henri Hiro, Charles Manutahi, Vaitiare and Turo Raapoto spearheaded the anticolonial writing in Tahiti. Hiro's God of Culture implores Oihanu, the Tahitian god of culture and husbandry, to empower the "new generation". Three women writers - Michou Chaze, Chantal Spitz and Vaitiare explore the problems of Tahitian identification in contemporary French Polynesia. Tahitian peasants and workers call themselves the "true Tahitians" (Taʼata Tahiti Mau) to distinguish from part-Europeans (Taʼata ʼafa Popaʼa). At the same time demis quite frequently identify themselves as indigenous people in terms of culture and political affiliation. Such Tahitian activists as Pouvanaa a Oopa, Francis Sanford and Charlie Ching and Catholic bishops Michel-Gaspard Coppenrath and Hubert Coppenrath are of demi ancestry. Many natives were painted from life by Paul Gauguin, who gave Tahitian titles to his works. In Ea haere ia oe (Where Are You Going?), for example, a pensive young girl wears the white flower tiare behind her left ear, signifying readiness to take a lover. Tahitians are French citizens and are represented by three elected deputies to the French National Assembly and two representatives in the French Senate. Tahitians vote by universal adult suffrage in all major French elections.
== History == For thousands of years, glassmakers were able to make colored glass by adding different dusts and powdered elements such as silver, gold and cadmium and then used different temperatures to produce shades of glass. In the 19th century, scientists started to understand how glass color depended on elements and heating-cooling techniques. It was also found that for the same element and preparation, the color depended on the dust particles' size. Herbert Fröhlich in the 1930s first explored the idea that material properties can depend on the macroscopic dimensions of a small particle due to quantum size effects. The first quantum dots were synthesized in a glass matrix by Alexei A. Onushchenko and Alexey Ekimov in 1981 at the Vavilov State Optical Institute and independently in colloidal suspension by Louis E. Brus team at Bell Labs in 1983. They were first theorized by Alexander Efros in 1982. It was quickly identified that the optical changes that appeared for very small particles were due to quantum mechanical effects. The term quantum dot first appeared in a paper first authored by Mark Reed in 1986. According to Brus, the term "quantum dot" was coined by Daniel S. Chemla while they were working at Bell Labs. In 1993, David J. Norris, Christopher B. Murray and Moungi Bawendi at the Massachusetts Institute of Technology reported on a hot-injection synthesis method for producing reproducible quantum dots with well-defined size and with high optical quality.
== Binding between UII and URP == Since they are both ligands for the same receptor, an experiment was done to determine which ligand had a higher affinity. When the binding of the two were compared and tested, URP actually had higher affinity.
=== Reproduction === Due to its geographic ranges, arapaima's lifecycle is greatly affected by seasonal flooding. Various pictures show slightly different coloring owing to colour changes when they reproduce. The arapaima lays its eggs when water levels are low or beginning to rise. They build a nest about 50 cm (20 in) wide and 15 cm (5.9 in) deep, usually in muddy-bottomed areas. As the water rises, the eggs hatch and the offspring have the flood season from May to August in which to prosper, such that yearly spawning is regulated seasonally.
Sources: en.wikipedia.org
genetic recombination Any reassortment or exchange of genetic material within an individual organism or between individuals of the same or different species, especially that which creates genetic variation. In the broadest sense, the term encompasses a diverse class of naturally occurring mechanisms by which nucleic acid sequences are copied or physically transferred into different genetic environments, including homologous recombination during meiosis or mitosis or as a normal part of DNA repair; horizontal gene transfer events such as bacterial conjugation, viral transduction, or transformation; or errors in DNA replication or cell division. Artificial recombination is central to many genetic engineering techniques which produce recombinant DNA.
=== Legal status === In Australia, morphine is classified as a Schedule 8 drug under the variously titled State and Territory Poisons Acts. In Canada, morphine is classified as a Schedule I drug under the Controlled Drugs and Substances Act. In France, morphine is in the strictest schedule of controlled substances, based upon the December 1970 French controlled substances law. In Germany, morphine is a verkehrsfähiges und verschreibungsfähiges Betäubungsmittel listed under Anlage III (the equivalent of CSA Schedule II) of the Betäubungsmittelgesetz. In Switzerland, morphine is scheduled similarly to Germany's legal classification of the drug. In Japan, morphine is classified as a narcotic under the Narcotics and Psychotropics Control Act (麻薬及び向精神薬取締法, mayaku oyobi kōseishinyaku torishimarihō). In the Netherlands, morphine is classified as a List 1 drug under the Opium Law. In New Zealand, morphine is classified as a Class B drug under the Misuse of Drugs Act 1975. In the United Kingdom, morphine is listed as a Class A drug under the Misuse of Drugs Act 1971 and a Schedule 2 Controlled Drug under the Misuse of Drugs Regulations 2001. In the United States, morphine is classified as a Schedule II controlled substance under the Controlled Substances Act under main Administrative Controlled Substances Code Number 9300. Morphine pharmaceuticals are subject to annual manufacturing quotas; in 2017 these quotas were 35.0 tonnes of production for sale, and 27.3 tonnes of production as an intermediate, or chemical precursor, for conversion into other drugs.
Hydrogen peroxide has a relatively elusive and highly unstable isomer called oxywater, also known as water oxide. Its chemical formula is H2OO and its systematic IUPAC name is oxidooxidanium. It is isoelectronic to fluoroamine and is a ylide. It rapidly decomposes to form hydrogen peroxide, the reaction mechanism for which is likely a 1,2-hydrogen shift.
Light and temperature impact the speed of deterioration, especially in combination with other agents of decay. Exposure of any length to light causes fading. Light both visible and UV can bleach and dry textiles as well as fade color. It is recommended that light is kept at 50 lux for textiles while on display. The length of exposure to light is determined by the type of textile and the object's current condition. Physical agents of decay include the natural breakdown of biological material, which causes fabrics to become more brittle as they age. Humidity is a factor that impacts textile fibers. Loss of moisture decreases the elasticity and increases brittleness. An environment that is too humid encourages pest activity and the growth of mold. Pests affect the physical makeup of textiles by eating fibers, and this destabilizes the fabrics. Pest activity can also discolor materials. Mold weakens and stains textiles. Chemical deterioration of textiles is caused by a variety of interactions. For example, the interaction of fibres with metals, pollutants, adhesives and other even other fibers can cause deterioration. Oxidation of metal threads or adornments can discolor and tarnish textiles due to the chemical reaction between the oxygen in the air and the fibers. Pollution impacts textiles. Pollution can come from the environment or the actual textile manufacturing process. These pollutants include pollen, mold, skin cells, ash, dirt and metal dust. Sources can include the museum exhibit and storage materials and air coming in from outside the museum.
Free fatty acid receptor 3 (FFAR3, also termed GPR41) protein is a G protein coupled receptor (i.e., GPR or GPCR) that in humans is encoded by the FFAR3 gene (i.e., GPR41 gene). GPRs reside on cell surfaces, bind specific signaling molecules, and thereby are activated to trigger certain functional responses in their parent cells. FFAR3 is a member of the free fatty acid receptor group of GPRs that includes FFAR1 (i.e., GPR40), FFAR2 (i.e., GPR43), and FFAR4 (i.e., GPR120). All of these FFARs are activated by fatty acids. FFAR3 and FFAR2 are activated by certain short-chain fatty acids (SC-FAs), i.e., fatty acids consisting of 2 to 6 carbon atoms whereas FFFAR1 and FFAR4 are activated by certain fatty acids that are 6 to more than 21 carbon atoms long. Hydroxycarboxylic acid receptor 2 is also activated by a SC-FA that activate FFAR3, i.e., butyric acid.
Sources: en.wikipedia.org
The National Institutes of Health has defined a biomarker as "a characteristic that is objectively measured and evaluated as an indicator of normal biological processes, pathogenic processes, or pharmacologic responses to a therapeutic intervention." Understanding the proteome, the structure and function of each protein and the complexities of protein–protein interactions are critical for developing the most effective diagnostic techniques and disease treatments in the future. For example, proteomics is highly useful in the identification of candidate biomarkers (proteins in body fluids that are of value for diagnosis), identification of the bacterial antigens that are targeted by the immune response, and identification of possible immunohistochemistry markers of infectious or neoplastic diseases. An interesting use of proteomics is using specific protein biomarkers to diagnose disease. A number of techniques allow to test for proteins produced during a particular disease, which helps to diagnose the disease quickly. Techniques include western blot, immunohistochemical staining, enzyme linked immunosorbent assay (ELISA) or mass spectrometry. Secretomics, a subfield of proteomics that studies secreted proteins and secretion pathways using proteomic approaches, has recently emerged as an important tool for the discovery of biomarkers of disease.
Radiation protection areas are spatial areas in which either people can receive certain body doses during their stay or in which a certain local dose rate is exceeded. They are defined in § 36 of the Radiation Protection Ordinance and in §§ 19 and 20 of the X-Ray Ordinance. According to the Radiation Protection Ordinance, radiation protection areas are divided into restricted areas (local dose rate ≥ 3 mSv/hour), control areas (effective dose > 6 mSv/year) and monitoring areas (effective dose > 1 mSv/year), depending on the hazard.
== Advantages and disadvantages == The major advantage of CYTOF is the ability to investigate a larger number of parameters per panel than other cytometry methods. This allows a greater understanding of complex and heterogeneous cell populations, without the need for many complex and overlapping panels. Panels can include up to 45 antibodies, as opposed to the 10 that can be done in conventional flow cytometry but require great expertise to design. However, development of spectral flow cytometry has closed the gap between flow and mass cytometry in terms of the maximum number of antibodies that can be used. More antibodies per panel saves on time, allows understanding of a larger picture, and requires fewer numbers of cells per experiment, which is particularly advantageous when samples are limited such as with tumour studies. The use of the heavy metal isotopes also lowers background when compared to using fluorescent antibodies. Some cell types, such as myeloid cells, have high rates of autofluorescence that create a lot of background noise in flow cytometry. However, the rare heavy metal isotopes used are not present in biological systems, therefore there is very little or no background seen, and overall sensitivity is increased. The detection overlap between the different heavy metals is also very low compared to the overlap seen in fluorescent cytometry, which makes it much simpler to design a panel of many markers. Fluorescent dyes are subject to photobleaching, requiring the entire process to happen within a few hours after staining.
=== Pharmacokinetics === The fraction of the drug that reaches the circulatory system intact (systemic bioavailability) after oral dosing is low, averaging only 0.6–0.7% in women and in men under fasting conditions. Intake together with meals and beverages other than water further reduces the bioavailability. The absorbed drug rapidly partitions, with approximately 50% binding to the exposed bone surface; the remainder is excreted unchanged by the kidneys. Unlike with most drugs, the strong negative charge on the two phosphonate moieties limits oral bioavailability, and, in turn, the exposure to tissues other than bone is very low. After absorption in the bone, alendronate has an estimated terminal elimination half-life of 10 years.
Sources: en.wikipedia.org
SR9009 is a synthetic small molecule studied as an agonist of the REV-ERB nuclear receptors. It is not an approved medicine, and its effects in humans are not well characterized.
No. It is a synthetic ligand that binds nuclear receptors, not a steroid or peptide hormone. Its activity depends on receptor binding rather than endocrine secretion.
Clinical evidence is limited. Most published data come from cell and animal experiments. Human safety and efficacy remain uncertain.
Legality depends on the country and the intended use. In many places it is not approved as a medicine and may be sold only as a research chemical. Importation or possession can be restricted, and sports organizations prohibit it.