The short version of DAC group fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-12-19 and is reviewed periodically as new material appears.
Two forms circulate under the CJC-1295 name, and they differ by a single appended group. The version without a drug affinity complex carries four substitutions along the peptide chain, including a D-alanine near the amino terminus and replacements at three other positions. These changes block the enzyme dipeptidyl peptidase IV and remove a methionine residue that is prone to oxidation. The modified fragment is frequently labeled MOD GRF 1-29. Naming conventions are inconsistent across informal sources, which is a common source of confusion.
The second form adds a maleimide-bearing linker to the lysine at the carboxyl end. This group reacts with cysteine-34 on circulating serum albumin, forming a covalent bond that keeps the peptide in the bloodstream for far longer. ConjuChem developed the molecule as a way to extend the action of a peptide without frequent administration. The albumin attachment is the defining structural feature of the drug affinity complex version. Whether continuous exposure produces effects distinct from shorter pulses remains an unresolved research question.
Batch-to-batch consistency depends on solid-phase peptide synthesis and subsequent purification. Coupling efficiency, resin choice, and cleavage conditions all affect the final profile. Counter-ion content and moisture can shift the apparent mass of a batch. Documentation typically includes a certificate of analysis with chromatograms and spectra. Independent verification by a second laboratory is sometimes requested. Whether a given certificate reflects the actual vial contents depends on chain of custody. Analytical methods themselves carry uncertainty that should be stated alongside results.
Lyophilized material is typically stored at minus twenty degrees Celsius or lower. Keeping the vial dry and protected from light preserves peptide integrity. Repeated freeze-thaw cycles can cause aggregation or loss of activity. Once dissolved, solutions are generally kept at two to eight degrees Celsius. Stability data for reconstituted solutions vary, and long-term behavior is not fully established. Working aliquots reduce the number of times a stock container is opened.
Reverse-phase high-performance liquid chromatography is the standard tool for purity assessment. The technique separates the target peptide from truncated or modified byproducts. Mass spectrometry confirms molecular weight and supports sequence verification. Electrospray ionization and matrix-assisted laser desorption are both used. Amino acid analysis provides an independent check on composition. Purity values are commonly reported as area percentage from the chromatogram. Residual trifluoroacetate and water content are also measured in many quality programs.
| Property | Value | Notes |
|---|---|---|
| Purity assessment | Reverse-phase HPLC | Reported as area percentage |
| Identity confirmation | Mass spectrometry | Electrospray or laser desorption |
| Powder storage | Minus 20 degrees Celsius or lower | Dark and dry conditions |
| Solution storage | Two to eight degrees Celsius | Avoid repeated freeze-thaw |
| Appearance | White to off-white powder | Common lyophilized form |
The attached maleimide group explains the unusual duration of the DAC version. After injection it reacts with the thiol of cysteine-34 on serum albumin, forming a stable covalent bond. The resulting conjugate is too large for rapid kidney filtration and is shielded from many peptidases. Reported half-lives for this form reach several days, whereas the version without the group is cleared in roughly half an hour. That gap is the main pharmacological difference between the two.
Downstream of growth hormone, the liver and other tissues increase production of insulin-like growth factor 1, a mediator of many growth-promoting effects. Studies have documented elevated levels of both hormones after dosing, and the rise from the long-acting form persists longer than that produced by shorter-acting analogues. What remains unclear is whether sustained elevation of these markers translates into meaningful clinical benefit, and whether prolonged exposure carries risks that short trials could not detect.
CJC-1295 acts at the growth hormone-releasing hormone receptor, a G-protein-coupled receptor found on somatotroph cells in the anterior pituitary. Binding triggers a rise in cyclic AMP and calcium entry, which promotes release of stored growth hormone. Because the peptide mimics the body's own releasing hormone, it amplifies existing secretory pulses rather than driving continuous output. The size of the response therefore depends partly on the subject's own hormonal rhythm and feedback state.
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.
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.
== Function == This gene encodes a selenoprotein, which contains a selenocysteine (Sec) residue at its active site. The selenocysteine is encoded by the UGA codon that normally signals translation termination. The 3' UTR of selenoprotein genes have a common stem-loop structure, the sec insertion sequence (SECIS), that is necessary for the recognition of UGA as a Sec codon rather than as a stop signal. Studies in mouse suggest that this selenoprotein may have redox function and may be involved in the quality control of protein folding.
β-catenin recruits other transcriptional coactivators, such as BCL9, Pygopus and Parafibromin/Hyrax. The complexity of the transcriptional complex assembled by β-catenin is beginning to emerge thanks to new high-throughput proteomics studies. However, a unified theory of how β‐catenin drives target gene expression is still missing, and tissue-specific players might assist β‐catenin to define its target genes. The extensivity of the β-catenin interacting proteins complicates our understanding: β-catenin may be directly phosphorylated at Ser552 by Akt, which causes its disassociation from cell-cell contacts and accumulation in cytosol, thereafter 14-3-3ζ interacts with β-catenin (pSer552) and enhances its nuclear translocation. BCL9 and Pygopus have been reported, in fact, to possess several β-catenin-independent functions (therefore, likely, Wnt signaling-independent).
82nd Airborne Division Division Headquarters 325th Glider Infantry Regiment (325th GIR) (received the 2nd Battalion, 401st GIR, 101st Airborne Division on 1 March 1945, which became the 3rd Battalion, 325th GIR) Headquarters and Headquarters Company 2× glider infantry battalions (3× glider infantry battalions from 1 March 1945) each battalion consists of: 1× Headquarters and Headquarters Company, 3× Rifle companies Anti-Tank Company (assigned 1 March 1945) Service Company 504th Parachute Infantry Regiment (504th PIR) Headquarters and Headquarters Company 3× parachute infantry battalions each battalion consists of: 1× Headquarters and Headquarters Company, 3× Rifle companies Service Company 505th Parachute Infantry Regiment (505th PIR) same organization as 504th Parachute Infantry Regiment 82nd Airborne Division Artillery Headquarters Battery 319th Glider Field Artillery Battalion Headquarters and Headquarters and Service Battery 2× Batteries (M1 75mm pack howitzers) 320th Glider Field Artillery Battalion same organization as 319th Glider Field Artillery Battalion 376th Parachute Field Artillery Battalion Headquarters and Headquarters and Service Battery 3× Batteries (M1 75mm pack howitzers) Anti-Aircraft and Anti-Tank Battery (M2 .50-caliber machine guns, M3 37mm Anti-Tank guns, and M1 Bazookas) 456th Parachute Field Artillery Battalion same organization as 376th Parachute Field Artillery Battalion Special Troops (Headquarters activated 1 March 45, until then the units below were directly under the Division Headquarters) Headquarters Company, 82nd Airborne Division 82nd Airborne Signal Company 407th Airborne Quartermaster Company 782nd Airborne Ordnance Company Reconnaissance Platoon (assigned 1 March 45) Military Police Platoon Band (assigned 1 March 45) 80th Airborne Anti-Aircraft Artillery Battalion Headquarters and Headquarters Detachment 3× Automatic weapon batteries (M3 37mm Anti-Tank guns and from June 1944 M1 57mm anti-tank guns) 3× Machine gun batteries (M2 .50-caliber machine guns) 307th Airborne Engineer Battalion Headquarters and Headquarters and Service Company 2× Glider engineer companies 1× Parachute engineer company 82nd Parachute Maintenance Company (provisional unit made permanent on 1 March 1945) 307th Airborne Medical Company Attached paratrooper units:
On 3 December 1984, over 500,000 people in the vicinity of the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, India, were exposed to the highly toxic gas methyl isocyanate, in what is considered the world's worst industrial disaster. A government affidavit in 2006 stated that the leak caused approximately 558,125 injuries, including 38,478 temporary partial injuries and 3,900 severely and permanently disabling injuries. Estimates vary on the death toll, with the official number of immediate deaths being 2,259. Others estimate that 8,000 died within two weeks of the incident occurring, and another 8,000 or more died from gas-related diseases. In 1989, Union Carbide Corporation (UCC) of the United States paid $470 million (equivalent to $1.03 billion in 2024) to settle litigation stemming from the disaster. The owner of the factory, Union Carbide India Limited (UCIL), was a publicly-traded company which was majority-owned and controlled by the UCC, while the remaining 49.1 percent stake was held by the Indian public and Indian government-controlled banks. In 1994, UCC sold its stake in UCIL to Eveready Industries India Limited (EIIL), which subsequently merged with McLeod Russel (India) Ltd. Eveready ended clean-up on the site in 1998, when it terminated its 99-year lease and turned over control of the site to the state government of Madhya Pradesh. Dow Chemical Company purchased UCC in 2001, seventeen years after the disaster.
== Toxicity, storage, and deactivation == Cyanogen bromide can be stored under dry conditions at 2 to 8 °C for extended periods. Cyanogen bromide is volatile, and readily absorbed through the skin or gastrointestinal tract. Therefore, toxic exposure may occur by inhalation, physical contact, or ingestion. It is acutely toxic, causing a variety of nonspecific symptoms. Exposure to even small amounts may cause fatal injury. LD50 orally in rats is reported as 25–50 mg/kg. Cyanogen bromide was used as a chemical weapon in the World War I by Austro-Hungarian forces, either as benzene solution or mixture with 25% bromoacetone and 50% benzene. The recommended method to deactivate cyanogen bromide is with sodium hydroxide and bleach. The aqueous alkali hydroxide instantly hydrolyzes BrCN to alkali cyanide and bromide. The cyanide can then be oxidized by sodium or calcium hypochlorite to the less toxic cyanate ion. Deactivation is extremely exothermic and may be explosive.
Sources: en.wikipedia.org
== Epidemiology == Numerical values regarding prevalence of uterine prolapse differ based on whether the epidemiologic study in question uses a physical exam or a symptom questionnaire to determine the presence of prolapse. Prevalence of pelvic organ prolapse was found to be consistently higher when physical exam was used (for uterine prolapse, this was 14.2% in one study and 3.8% in another) compared to a symptom-based determination in which the prevalence of any type of prolapse, including uterine prolapse, was 2.9% to 8% in the U.S. Using Women's Health Initiative data, the incidence of grades 1 to 3 uterine prolapse was approximately 1.5/100 women-years and progression of uterine prolapse was found to be about 1.9%.
Because of its position at the mouth of the Guadalquivir, Sanlúcar is a convenient home base for exploring the nearby Doñana National Park (Parque Nacional de Doñana) and its natural features. Within the park lies the Marisma de Hinojos (Salt Marsh of Fennel Plants); also within its precincts is the possible site of the legendary lost city of Tartessos, the capital of an ancient civilization that predated the Phoenicians in Iberia.
== Animal welfare == The chicken and eggs served at A&W are from hens who lived in enriched cages and were fed a vegetarian diet, as chickens are omnivores. Antibiotics are only used in the company's animals when medically necessary, and those animals are taken out of production. Moreover, A&W claimed to be trying to use 100% open housing by 2021. A&W has also announced plans for their meat production to meet Global Animal Partnership's level 2 certification, but did not provide a timeline.
== Biosynthesis == Elabela gene encodes a pre-proprotein of 54 amino acids, with a signal peptide in the N-terminal region. After translocation into the endoplasmic reticulum and cleavage of the signal peptide, the proprotein of 32 amino acids may generate several active fragments.
Sources: en.wikipedia.org
The powder is normally held at minus twenty degrees Celsius or below. Light and moisture exposure should be minimized. Repeated warming and cooling cycles are avoided.
Reverse-phase high-performance liquid chromatography is used for purity. Mass spectrometry confirms molecular weight and sequence integrity. Amino acid analysis offers an additional compositional check.
Published stability data for dissolved material are limited and vary with conditions. Refrigerated solutions are generally used within a short period. The exact shelf life depends on concentration, buffer, and handling.
It binds the growth hormone-releasing hormone receptor on pituitary somatotroph cells. Receptor activation raises cyclic AMP and promotes release of stored growth hormone granules. Because the peptide persists longer than natural releasing hormone, stimulation is prolonged rather than brief.