Everything below concerns DAC. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-07-22. Numbers and descriptions here follow the published literature rather than marketing material.
Lyophilized material is generally stable for extended periods when held at minus twenty degrees Celsius or below and protected from moisture and light. In solution the peptide is more labile; bond hydrolysis, aggregation and oxidation of susceptible residues all proceed faster at ambient temperature. Repeated freeze and thaw cycles should be avoided because they promote clumping and loss of soluble material. The conjugated variant adds a further consideration, since the maleimide group can hydrolyze in aqueous buffer and lose its ability to react with albumin.
Laboratory handling centers on minimizing exposure to water, heat and oxygen before use. Working solutions are typically prepared in sterile water or a mild buffer, and any residual particulate matter is removed by filtration. When the powder dissolves slowly, a small proportion of acetonitrile or dilute acetic acid is sometimes added as a co-solvent. Containers are kept sealed and desiccated between uses. Records of lot number, reconstitution date and storage conditions support later comparison of results across experiments.
Four amino acid substitutions separate the modified backbone from the parent GRF(1-29) sequence. These changes reduce recognition by dipeptidyl peptidase IV and related proteases, extending the interval before degradation. Development work in this area sought longer-acting GHRH analogs for endocrine investigation. Published descriptions treat the substitution set as a defining property of the core sequence, while the albumin-binding linker is described separately as an optional addition to that same backbone.
CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone, constructed on the 29-amino-acid fragment designated GRF(1-29). The name began as an internal development code during the 1990s and later spread through research supply catalogs and discussion forums. The molecule does not occur in nature; its sequence is engineered rather than isolated from tissue. Two related compounds are sold under this single label, and they differ by one appended chemical group that strongly influences how long the peptide remains in circulation.
The dividing feature between the two forms is a maleimide-based drug affinity complex, abbreviated DAC. In the DAC-bearing version, a linker attaches the peptide to serum albumin after administration, and that association slows removal from plasma. The version lacking DAC appears in catalogs as MOD GRF(1-29) or tetrasubstituted GRF(1-29). Because informal writing treats both as one item, comparisons drawn from such sources routinely blend measurements taken from two molecules with substantially different behavior.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off white powder | Typical lyophilized form |
| Water solubility | Soluble | May need a small organic co-solvent |
| Purity assessment | Chromatographic peak area | Most certificates report a percentage figure |
| Storage temperature | Minus 20 C or lower | Dry, dark, sealed container |
| Identity check | Electrospray mass spectrometry | Compared against theoretical mass |
Verification matters because research peptides vary widely in quality. A certificate of analysis is only as reliable as the method behind it, and a single chromatographic trace reveals little about counter-ions, residual solvents, or water content. Independent laboratories commonly pair mass confirmation with chromatographic purity and, where relevant, quantify water along with acetate or trifluoroacetate content. Reported purity figures are not standardized across suppliers, so a stated value such as ninety-eight percent is not directly comparable unless the analytical method, column, and detection wavelength accompany it.
Characterization of this peptide relies on a small set of routine techniques. Reversed-phase high-performance liquid chromatography separates the target from truncated or oxidized by-products and yields a purity estimate when paired with ultraviolet detection near 214 nanometers. Mass spectrometry, either electrospray coupled to liquid chromatography or matrix-assisted laser desorption, confirms that the observed mass matches the value calculated for the expected sequence. Amino acid analysis, and enzymatic digestion followed by fragment mapping, are used when the sequence itself rather than the mass requires verification.
The peptide backbone corresponds to GRF(1-29), the first 29 residues of native growth hormone-releasing hormone, which retains most of the receptor-activating activity of the full-length molecule. Four substitutions distinguish the analog from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes slow cleavage by dipeptidyl peptidase IV, the enzyme that degrades native hormone in plasma within minutes. The outcome is improved enzymatic stability combined with a still brief residence time when no additional modification is present.
Naming in this area is inconsistent, and readers should treat product labels with care. In much of the literature and in vendor catalogs, the unqualified term refers to the albumin-binding version, while the version lacking the DAC group appears as modified GRF(1-29), mod GRF(1-29), or the same name with a without-DAC qualifier. Because one abbreviation has been applied to both materials, the only reliable way to identify a sample is to check the stated sequence and the presence of the linker.
CJC-1295 is the name used for a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound was described by a Canadian drug discovery company in the mid-2000s as a long-acting research tool. Two closely related molecules share the name in practice: one carries a drug affinity complex, or DAC, group, and one does not. The distinction matters because the two behave differently in circulation.
Drugs such as benzodiazepines, diuretics, or narcotics can also precipitate encephalopathic events. A low protein diet is recommended with gastrointestinal bleeding. The severity of hepatic encephalopathy is determined by assessing the patient's mental status. This is generally a subjective assessment, although several attempts at creating criteria to help standardize this assessment have been published. One example is the West Haven criteria, reproduced below.
== Biotechnology research == Hamer invented the first method for introducing new genes into animal cells using SV40 vectors while a graduate student at Harvard Medical School. This approach was used to produce a variety of biomedical products including human growth hormone and a vaccine for Hepatitis B, resulting in 4 US patents. At NIH, Hamerʻs lab initially focused on the metallothionein gene system. They elucidated the mechanism of induction of yeast metallothionein by copper ions, one of the first eukaryotic gene regulatory systems to be understood at the molecular level and a useful method for regulating therapeutic protein production.
=== Israel === Schumer has been a vocal advocate for Israel following the October 7 attacks, a stance for which she has received backlash. Critics have accused Schumer of posting Islamophobic content and misinformation, including sharing a post which depicted pro-Palestinian protesters as holding up signs that read, "Gazans rape Jewish girls only in self-defense". In October 2023, Schumer was one of over 700 Hollywood professionals who signed an open letter condemning Hamas and demanding the release of hostages held in Gaza. That month, she was criticized for a social media post in which she asserted that an Islamic Jihad missile was responsible for the Al-Ahli Arab Hospital explosion and accused media outlets of "blaming Israel" for the explosion. Schumer told Variety in 2024, "I don't agree with anything that Netanyahu is doing, and neither do the Israelis I know. Of course what's going on in Gaza is sickening, horrifying and unthinkable". She added, "The focus is so razor-sharp on Jewish people but not on Hamas", and recommended that people read Israel: A Simple Guide to the Most Misunderstood Country on Earth, a 2021 book by Noa Tishby. In January 2026, Schumer defended Israeli comedian Guy Hochman after a Beverly Hills theater canceled his show when he refused to condemn the Gaza genocide.
D-amino-acid dehydrogenase (EC 1.4.99.1, transferred to 1.4.99.6) is a bacterial enzyme that catalyses the oxidation of D-amino acids into their corresponding oxoacids. It contains both flavin and nonheme iron as cofactors. The enzyme has a very broad specificity and can act on most D-amino acids.
== Effects == CJC-1295 may markedly increase plasma growth hormone (GH) and insulin-like growth factor 1 (IGF-1) levels in animals and humans. With a single injection, in human subjects, CJC-1295 DAC may increase plasma GH levels by 2- to 10-fold for 6 days or longer and plasma IGF-1 levels by 0.5- to 3-fold for 9 to 11 days. With the inclusion of the DAC additive, the drug has an estimated half-life of about 6 to 8 days in humans. With multiple doses of CJC-1295, IGF-1 levels were found to remain elevated in humans for up to 28 days. CJC-1295 has been shown to extend the half-life and bioavailability of growth-hormone-releasing hormone 1-29 and stimulate insulin-like growth factor 1 secretion. It increases the half-life of acting agents by bioconjugation. The extended half-life is achieved through the addition of a drug affinity complex (DAC) that binds to albumin, thus prolonging the peptide's presence in the bloodstream. It is primarily used for its potential to stimulate the release of growth hormone (GH) from the pituitary gland.
Sources: en.wikipedia.org
==== Cylindrical spirals myopathy ==== Cylindrical spirals myopathy is very rare with only 18 individual cases described as of 2013. The majority of cases are sporadic, and has been observed in only 3 families. It is characterized by the presence of cylindrical spirals as the main pathological finding in muscle biopsies. Cylindrical spirals are unusual membrane structures that have a spiral pattern. These membrane structures are seen during electron microscopic examination of the affected muscle. These structures merge into or are surrounded by tubular structures that resemble tubular aggregates. Tubular aggregates are abnormal accumulations of membranous tubules and have been observed in a wide variety of muscle diseases and originate from the sarcoplasmic reticulum. Cylindrical spirals were first described in 1979 and were thought to be a non-specific reaction of skeletal muscle secondary to a metabolic disturbance or muscle fibre injury. The molecular basis of cylindrical spiral myopathy is currently unknown, however a genetic mutation affecting the sarcoplasmic reticulum in some patients seems likely, as SERCA1, calsequestrin, and RYR1 have been shown to bind to cylindrical spirals. Cylindrical spirals have also been shown to react with the mitochondrial enzyme succinate dehydrogenase, which suggests that cylindrical spirals originate from mitochondria. Phenotypes are quite variable, and manifestations can include weakness, abnormal gait, myotonia, cramps, and scoliosis.
==== 2300–2399 ==== Sandwell Borough Council (Patent Shaft/Moorcroft Infrastructure) (Walsall Canal Bridge) Scheme 1993 Confirmation Instrument 1993 (S.I. 1993/2302) Civil Aviation (Canadian Navigation Services) (Fourth Amendment) Regulations 1993 (S.I. 1993/2320) Highlands and Islands Rural Enterprise Programme (Revocation) Regulations 1993 (S.I. 1993/2325) Value Added Tax (Reverse Charge) Order 1993 (S.I. 1993/2328) Telecommunications (Leased Lines) Regulations 1993 (S.I. 1993/2330) Coal Mines (Owner's Operating Rules) Regulations 1993 (S.I. 1993/2331) Combined Probation Areas (East Sussex) Order 1993 (S.I. 1993/2332) Plant Health Fees (Scotland) Amendment Order 1993 (S.I. 1993/2344) Environmentally Sensitive Areas (Cairngorms Straths) Designation Order 1993 (S.I. 1993/2345) Act of Sederunt (Enforcement of Judgments under the Civil Jurisdiction and Judgments Act 1982) (Authentic Instruments and Court Settlements) 1993 (S.I. 1993/2346) Haydon Natural Gas Pipe–lines Order 1993 (S.I. 1993/2347) Croydon, Merton and Sutton (London Borough Boundaries) Order 1993 (S.I. 1993/2350) Angola (United Nations Sanctions) Order 1993 (S.I. 1993/2355) Angola (United Nations Sanctions) (Dependent Territories) Order 1993 (S.I. 1993/2356) Angola (United Nations Sanctions) (Channel Islands) Order 1993 (S.I. 1993/2357) Angola (United Nations Sanctions) (Isle of Man) Order 1993 (S.I. 1993/2358) Exempt Charities Order 1993 (S.I. 1993/2359) Clinical Thermometers (EEC Requirements) Regulations 1993 (S.I. 1993/2360) Ionising Radiations (Outside Workers) Regulations 1993 (S.I.
Some hydrothermal vents form roughly cylindrical chimney structures. These form from minerals that are dissolved in the vent fluid. When the superheated water contacts the near-freezing sea water, the minerals precipitate out to form particles which add to the height of the stacks. Some of these chimney structures can reach heights of 60 m (200 ft). An example of such a towering vent was "Godzilla", a structure on the Pacific Ocean deep seafloor near Oregon that rose to 40 m (130 ft) before it fell over in 1996.
=== Collegiate === North Carolina State University is located in southwest Raleigh where the Wolfpack competes nationally in 24 intercollegiate varsity sports as a member of the Atlantic Coast Conference. The university's football team plays in Carter–Finley Stadium, the second largest football stadium in North Carolina, while the men's basketball team shares the Lenovo Center with the Carolina Hurricanes hockey club. The Wolfpack women's basketball, volleyball, and gymnastics as well as men's wrestling events are held on campus at Reynolds Coliseum. The men's baseball team plays at Doak Field.
== Epidemiology == The current estimated global incidence annually is 20,000 to 50,000 people, though a large number of cases are believed to go unreported. Due to the limited habitats of ciguatoxin-producing microorganisms, ciguatera is common only in subtropical and tropical waters, particularly the Pacific and Caribbean, and usually is associated with fish caught in tropical reef waters. Exportation of reef fish, as well as tourism, often account for cases that develop in other regions. Ciguatoxin is found in over 400 species of reef fish. Avoiding consumption of all reef fish is the only sure way to avoid exposure. Imported fish served in restaurants may contain the toxin and produce illness which often goes unexplained by physicians unfamiliar with the symptoms of a tropical toxin. Ciguatoxin can also occur in farm-raised salmon. Furthermore, species substitution, labeling a reef fish as a non-reef fish at restaurants and retail, can complicate efforts by consumers to avoid ciguatera.
Sources: en.wikipedia.org
=== Filming === For the scene where Baby Billy exposes himself naked to Jesse, Judy and Kelvin, Walton Goggins was offered the option of getting naked, but he declined. He said, "We've done lot of chaotic things over the course of our 12-year collaboration; I will follow Danny McBride anywhere — except there. That's one thing I won't do. Danny McBride commented, "The beautiful thing about Walton is that he's never shown his actual penis on the show. It's always a stunt double penis. Another fun fact: it's never the same penis. We've cast different elderly penises — or Peni — for all his scenes." Tim Baltz did his own stunts for his character's pole dancing, saying "I was excited, because it felt like an evolution of the character; I felt like each season there was something more ridiculous that BJ was getting into. It made perfect sense that this was the hobby, but I wasn't prepared for it, so I just started pounding creatine and training hard."
== In popular culture == British actor Bob Hoskins portrayed Manuel Noriega in the biographical 2000 American television movie Noriega: God's Favorite. Noriega was also depicted in the 2012 video game Call of Duty: Black Ops II. In July 2014, he filed a lawsuit against the game company Activision for depicting him and using his name without his permission. Noriega, who filed the suit while in prison for murder, claimed he was portrayed as "a kidnapper, murderer and enemy of the state". On October 28, 2014, the case against Activision was dismissed in California by Judge William H. Fahey.
The Lowland distillers, who had no opportunity to avoid taxation, complained that untaxed Highland whisky made up more than half the market. The heavy taxation during the Napoleonic Wars gave the illicit trade a large advantage, but their product was also considered better quality, commanding a higher price in the Lowlands. This was due to the method of taxation: malt was subject to tax (at a rate that climbed substantially between the 1790s and 1822). The licensed distillers, therefore, used more raw grain in an effort to reduce their tax bill. The Highland magistrates, themselves members of the landowning classes, had a lenient attitude to unlicensed distillers—all of whom would be tenants in the local area. They understood that the trade supported the rents paid. Imprisoned tenants would not be able to pay any rent. In 1823, Parliament eased restrictions on licensed distilleries with the Excise Act 1823 (4 Geo. 4. c. 94), while at the same time making it harder for the illegal stills to operate. Magistrates found counsel for the Crown appearing in their courts, so forcing the maximum penalties to be applied, with some cases removed to the Court of Exchequer in Edinburgh for tougher sentences. Highland landowners were now happy to remove tenants who were distillers in clearances on their estates. These changes ushered in the modern era of Scotch production: in 1823 2,232,000 gallons of whisky had duty paid on it; in 1824 this increased to 4,350,000 gallons.
Portal: Prelude - An unofficial prequel to Portal, set before the activation of GLaDOS when scientists used to watch over the test chambers and instruct the test subjects. Portal Reloaded - A mod atop Portal 2 that introduces the ability to place a third portal that sends the player-characters or objects through between the present and a future state of the same test chamber. Actions in the present state will alter the future, though manipulation of the future situation will not impact the present, allowing, for example, for one to bring a weighted cube set in the present from its position in the future, back through the time portal, and use that version of the cube in the present. Portal: Revolution - A mod build on Portal 2 by Second Face Software, in which the player controls an anonymous test subject in the destroyed Aperture Science laboratories. The player is tasked to repair a teleportation device. The mod is set in between the events of Portal and Portal 2. Portal Stories: Mel - A mod build on Portal 2, in which the player controls Mel, a female test subject who is named after a character that Valve had originally designed for Portal 2's cooperative mode. It is a fan-made mod that takes place after the events of Portal and before the events of Portal 2. Prospekt - A fan-made sequel to Half-Life: Opposing Force that follows its protagonist, U.S. Marine Adrian Shepherd, as he is sent to help Gordon Freeman during the "Nova Prospekt" segment of Half-Life 2.
Sources: en.wikipedia.org
The mass difference from the linker is large enough for routine detection by mass spectrometry. The unconjugated form gives a single sharp signal at its expected weight. Material that has already reacted with albumin shows a much higher mass and a broadened chromatographic peak.
Yes. Degradation proceeds faster once the powder is dissolved, especially at room temperature or after multiple freeze and thaw cycles. Working solutions are often aliquoted to avoid repeated handling. Lyophilized powder held cold and dry retains its properties far longer.
Truncated sequences, oxidized residues and aggregated forms can all elute near the main peak. Reversed phase chromatography resolves many of these species, so the number of peaks is a useful indicator of synthesis quality. A single peak does not by itself prove correct sequence, which is why mass confirmation is paired with it.
No. It is a laboratory-synthesized analog built on a fragment of the natural hormone. The natural peptide is shorter-lived and lacks the stabilizing substitutions found in the synthetic version.