REV-ERB agonist raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-10-30. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | SR9009 | Also referred to as Stenabolic in non-scientific contexts. |
| Chemical class | Synthetic small molecule | Not a steroid or peptide hormone. |
| Receptor target | REV-ERBα and REV-ERBβ | Nuclear receptor agonist in preclinical studies. |
| Development status | Investigational | No approved human therapeutic indication. |
| Regulatory attention | Prohibited in sport | Listed by anti-doping authorities. |
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
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.
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.
Nickel-59 is a long-lived cosmogenic radionuclide with a half-life of 81,000 years. 59Ni has found many applications in isotope geology. 59Ni has been used to date the terrestrial age of meteorites and to determine abundances of extraterrestrial dust in ice and sediment.
Resilin is an elastomeric protein found in many insects and other arthropods. It provides soft rubber-elasticity to mechanically active organs and tissue; for example, it enables insects of many species to jump or pivot their wings efficiently. Resilin was first discovered by Torkel Weis-Fogh in locust wing-hinges. Resilin is currently the most efficient elastic protein known (Elvin et al., 2005). The elastic efficiency of the resilin isolated from locust tendon has been reported to be 97% (only 3% of stored energy is lost as heat). It does not have any regular structure but its randomly coiled chains are crosslinked by di- and tri-tyrosine links at the right spacing to confer the elasticity needed to propel some jumping insects distances up to 38 times their length (as found in fleas). Resilin must last for the lifetime of adult insects and must therefore operate for hundreds of millions of extensions and contractions; its elastic efficiency ensures performance during the insect's lifetime. Resilin exhibits unusual elastomeric behavior only when swollen in polar solvents such as water. In 2005, a recombinant form of the resilin protein of the fly Drosophila melanogaster was synthesized by expressing a part of the fly gene in the bacterium Escherichia coli. Active studies are investigating potential application of recombinant resilins in biomedical engineering and medicine.
Judith Lucy did not return in 2021 and Zoë Coombs Marr joined as a new cast member in season 7 with the running joke that she was fired from the show in episode one yet she kept returning to work for the show.
While many other authors had published works of fantasy before Tolkien, the great success of The Hobbit and The Lord of the Rings led directly to a popular resurgence and the shaping of the modern fantasy genre. This has caused Tolkien to be popularly identified as the "father" of modern fantasy literature—or, more precisely, of high fantasy, as in the work of authors such as Ursula Le Guin and her Earthsea series. In 2008 The Times ranked him sixth on a list of "The 50 greatest British writers since 1945", and in 2024, Forbes ranked him #60 on a list of 101 greatest authors of all time. His influence has extended to music, including the Danish group the Tolkien Ensemble's setting of all the poetry in The Lord of the Rings to their vocal music; and to a broad range of games set in Middle-earth. Among literary allusions to Tolkien, he appears as the elderly "Professor J. B. Timbermill" in all five novels in J. I. M. Stewart's series A Staircase in Surrey. The scholar Tom Shippey describes Tolkien as the "author of the [20th] century", and states that "I do not think any modern writer of epic fantasy has managed to escape the mark of Tolkien, no matter how hard many of them have tried". John Clute, writing in The Encyclopedia of Fantasy, similarly credits Tolkien with being "the twentieth-century's single most important author of fantasy". His work has had a massive impact on Western pop culture, and remains extremely influential.
=== Timeline of the struggle for professional equality in France === 1900: Law allowing women full access to the bar, including the right to plead. 1907: A law authorizes married women to freely dispose of their salary. Previously, all earnings went to their husbands. They are also now allowed to sit on labor tribunals. 1908: Law grants eight weeks of maternity leave, unpaid. 1920: Women can join a union without their husband's authorization. 1924: Women are allowed to take the baccalauréat exam (some had already done so in the past, notably Julie-Victoire Daubié, but from now on, secondary education is the same for both sexes, allowing more girls to aim for this diploma). 1928: Two-month fully paid maternity leave is granted in the civil service. 1938: Women's legal incapacity is lifted. They can attend university, pursue studies, and obtain an identity card or passport without their husband's permission (Renoult law). However, the husband remains the head of the household and can forbid his wife from working. 1942: Widowed women are allowed to work, even if their husbands were employed, provided this does not cause layoffs. 1944: Women are granted the right to vote. 1945: The concept of "women's wages" is abolished. The principle "equal pay for equal work" is written into the legislation. 1946: Women can become judges. 1965: Reform of matrimonial regimes: women can work and open a bank account without their husband's authorization and benefit from social advantages. 1967: Medical contraception is legalized by the Neuwirth law.
Sources: en.wikipedia.org
Square cut shoulder – shoulder roast, shoulder chops and arm chops Rack – rib chops and riblets, rib roast Loin – loin chops or roast Leg – sirloin chops, leg roast (leg of lamb) Neck Breast Shanks (fore or hind) Flank
The minus sign comes from the convention that the force is considered towards the surface element, while the normal vector points outward. The equation has meaning in that, for any surface S in contact with the fluid, the total force exerted by the fluid on that surface is the surface integral over S of the right-hand side of the above equation. It is incorrect (although rather usual) to say "the pressure is directed in such or such direction". The pressure, as a scalar, has no direction. The force given by the previous relationship to the quantity has a direction, but the pressure does not. If we change the orientation of the surface element, the direction of the normal force changes accordingly, but the pressure remains the same. Pressure is distributed to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point. It is a fundamental parameter in thermodynamics, and it is conjugate to volume. It is defined as a derivative of the internal energy of a system:
The following list contains only notable graduates and former students of Columbia College, the undergraduate liberal arts division of Columbia University, and its predecessor, from 1754 to 1776, King's College. For a full list of individuals associated with the university as a whole, see the List of Columbia University people. An asterisk (*) indicates a former student who did not graduate.
Phlebotomy licensure in the United States is the process by which various regulatory bodies regulate the practice of phlebotomy through licensure. There are no federal phlebotomy training or certification requirements, though several states have imposed their own requirements. In 2024, four states require licensure for phlebotomy: California, Louisiana, Nevada, and Washington. In 2001, California enacted phlebotomy licensure after an on-the-job trained phlebotomist was found to be re-using needles. Following California, several states including Massachusetts and Missouri attempted to introduce either licensure or training/educational requirements, but the bills died. Phlebotomy licensure advocates claim that the licensure would enhance the quality of personnel, while the laboratory industry opposes phlebotomy licensure as an unnecessary cost. Phlebotomy is not without risk, and more challenging patients increase the chance of complications. However, without licensure, it can be difficult to hold bad actors accountable. Nonphysician healthcare personnel, including phlebotomists, may be sued due to poor practice standards. Increasingly, a number of healthcare facilities are rolling phlebotomy duties into their patient care technician roles or other allied health roles. A number of FDA 510k cleared devices, such as the BD Minidraw have been introduced to enable the drawing of blood without a phlebotomist. Additionally, there are devices to help aid non-phlebotomists more readily find veins.
Sources: en.wikipedia.org
Opioids bind to specific opioid receptors in the nervous system and other tissues. There are three principal classes of opioid receptors, μ, κ, δ (mu, kappa, and delta), although up to seventeen have been reported, and include the ε, ι, λ, and ζ (Epsilon, Iota, Lambda and Zeta) receptors. Conversely, σ (Sigma) receptors are no longer considered to be opioid receptors because their activation is not reversed by the opioid inverse-agonist naloxone, they do not exhibit high-affinity binding for classical opioids, and they are stereoselective for dextro-rotatory isomers while the other opioid receptors are stereo-selective for levo-rotatory isomers. In addition, there are three subtypes of μ-receptor: μ1 and μ2, and the newly discovered μ3. Another receptor of clinical importance is the opioid-receptor-like receptor 1 (ORL1), which is involved in pain responses as well as having a major role in the development of tolerance to μ-opioid agonists used as analgesics. These are all G-protein coupled receptors acting on GABAergic neurotransmission.
== Human adverse effects == After the bite, almost no pain will be felt at the bite site. However, after a (short) while, speech may slur, swallowing will become more difficult and the person might feel dizzy. Somewhat later, the weakness can spread from the face region to the limbs, and muscles may become slightly paralyzed. Respiratory failure, such as shortness of breath, can happen as well in this stage. After 6-30 hours of the envenomation, victims may be unable to move or unable to breathe. Death can occur when cardiac arrest happens due to lack of oxygen. About 27.3% of the patients in Taiwan experienced either general pain symptoms or respiratory failure. There is specific antivenom available in Taiwan but this may not effectively prevent respiratory failure and pain. Patients must be closely monitored within the first few hours of envenomation for signs of paralysis and respiratory distress.
==== Animal models ==== The safety of adjuvants are often tested using animal models. Model animals are given a dose of the adjuvant (sometimes comparable to real human/animal vaccines, sometimes higher) by injection, at a site that may or may not be analogous to real-life use. For example, aluminium adjuvants can kill motor neurons when subcutaneously injected at the scruff of a mouse's neck; oil–water suspensions such as pristane produces a precursor to lupus when given to mice by intraperitoneal injection; and arthritis-prone rat strains develop rheumatoid arthritis when injected with 0.2–0.3 mL squalene at the tail. All three examples above concern the classical "grandfathered" adjuvants: if a new adjuvant candidate shows these ill effects in animal testing, it would likely not be further developed, let alone becoming widely used. But more importantly, no effect similar to the above has been found in humans during the decades of their use (including among people genetically predisposed to autoimmunity), showing that animal models are not perfect models – nothing can be a perfect model of another thing, after all.
=== Concerns about the medical evidence === Much of the medical evidence presented at trial has been criticised by experts across several specialties, including neonatology, pathology, nursing, biochemistry and forensic toxicology. Points of scrutiny have included the prosecution's assertions that the infants were clinically stable before their collapses, that alternative explanations could be excluded, and that the alleged mechanisms of harm were medically plausible. Controversy has also arisen from the fact that the original post‑mortem reports for the infants—most of whom underwent autopsy—did not identify suspicious or unnatural causes of death. In February 2025, a panel organised and instructed by Letby's defence team that was led by neonatologist Shoo Lee released findings from their own review of the deaths and collapses (see: § Expert panel investigation). The panel claimed that all of the incidents could be explained by natural causes, substandard care, or a combination of both, and claimed no evidence of deliberate harm.
=== Development suspended === EQ-101 (BNZ132) – intravenous – alopecia areata – interleukin 15 receptor antagonist, interleukin 2 receptor antagonist, interleukin 9 receptor antagonist Research programme: SNA based alopecia therapeutics - Exicure/AbbVie – alopecia – gene expression modulators XCUR-17 – topical – alopecia – RNA interference
Sources: en.wikipedia.org
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.
No. It is a small molecule that binds nuclear receptors involved in circadian regulation. Its classification differs from anabolic steroids or peptide hormones.
Published human clinical trial data are lacking. Most safety and activity information comes from preclinical models, so effects in people remain uncertain.
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.