The short version of DAC group fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-09-19. Anything still debated is marked as such rather than presented as settled.
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.
Once in circulation, the peptide binds the growth hormone-releasing hormone receptor displayed on pituitary somatotroph cells. Receptor activation couples to Gs proteins, elevates intracellular cyclic AMP, and drives protein kinase A signaling inside the cell. That cascade increases discharge of growth hormone into the bloodstream. The analog therefore operates through a receptor pathway that already exists for the body's own releasing hormone, rather than through an engineered artificial target.
Clearance profiles diverge sharply between the two versions. The albumin-binding molecule stays in plasma for several days, whereas the unmodified analog is largely gone within about half an hour in reported work. Cleavage by dipeptidyl peptidase IV is a major contributor to the short life of the unmodified sequence. These gaps mean the two versions cannot be substituted for each other in study design or in reading results side by side.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | GHRH analog, not a steroid |
| Backbone length | 29 amino acids | Based on GRF(1-29) |
| Substitutions | Four positions | D-Ala2, Gln8, Ala15, Leu27 |
| Appearance | White to off-white powder | Typical lyophilized research material |
| Common synonyms | Modified GRF(1-29) | Usage varies between sources |
Lyophilized peptide powder is comparatively stable when kept dry, cold, and protected from light. Once dissolved, the molecule is vulnerable to deamidation, oxidation, and aggregation, with the rate depending on pH, buffer composition, and temperature. Alkaline conditions and repeated freeze-thaw cycles accelerate loss of the intact peptide. The methionine present in the native sequence is a known oxidation site, which is one reason it was replaced in the modified fragment. Suppliers typically recommend cold storage of solutions and use within a short window.
Analytical confirmation usually relies on reversed-phase high-performance liquid chromatography for purity and on liquid chromatography coupled to mass spectrometry for identity. Mass data reveal the expected molecular mass and can flag truncated or oxidized species. Amino acid analysis and peptide mapping provide sequence-level verification. Immunoassays are used in some biological matrices, but antibodies raised against one releasing-hormone analog may cross-react with another. Reported purity figures depend heavily on the method used, so comparisons between suppliers require matching the analytical approach.
The two variants differ dramatically in how long they persist in circulation. The form lacking the albumin-binding group has a plasma half-life measured in tens of minutes, comparable to the natural hormone fragment. The version carrying the drug affinity complex binds albumin and shows a half-life of roughly six to eight days in human studies. That figure comes from small trials that tracked hormone levels over extended periods. The physiological consequences of sustained versus pulsatile stimulation are still debated and the literature does not settle the point.
Studies in this area generally track growth hormone pulses, insulin-like growth factor 1 concentrations, and occasionally body composition endpoints. Most published human data come from early, small trials, and questions about long-term effects remain open. Whether repeated exposure alters pituitary responsiveness over time is not settled. Analytical work relies on immunoassays for the hormones and on mass spectrometry for the peptide itself, because the two measurements answer different questions.
Binding of the peptide to the growth hormone-releasing hormone receptor on pituitary somatotrophs triggers a G protein coupled cascade that raises cyclic AMP and opens calcium channels. The result is greater secretion of growth hormone into the bloodstream. Because the peptide acts at the same receptor as the natural hypothalamic hormone, its effect is amplified pulse size rather than an entirely separate release pathway. Receptor binding alone does not determine the response, since somatostatin tone and other inputs modulate the final output.
The albumin-binding version stays in circulation for days, because covalent attachment to serum albumin shields the peptide from rapid filtration and degradation. Reported half-lives for this form fall in the range of several days. The version without the linker is cleared in minutes, with estimates often near thirty minutes in animal work. These figures come from small studies and vary with assay method, species, and route, so they are best read as approximate rather than fixed constants.
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.
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.
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.
Atmospheric pressure photoionization (APPI) is a soft ionization method used in mass spectrometry (MS) usually coupled to liquid chromatography (LC). Molecules are ionized using a vacuum ultraviolet (VUV) light source operating at atmospheric pressure (105 Pa), either by direct absorption followed by electron ejection or through ionization of a dopant molecule that leads to chemical ionization of target molecules. The sample is usually a solvent spray that is vaporized by nebulization and heat. The benefit of APPI is that it ionizes molecules across a broad range of polarity and is particularly useful for ionization of low polarity molecules for which other popular ionization methods such as electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI) are less suitable. It is also less prone to ion suppression and matrix effects compared to ESI and APCI and typically has a wide linear dynamic range. The application of APPI with LC/MS is commonly used for analysis of petroleum compounds, pesticides, steroids, and drug metabolites lacking polar functional groups and is being extensively deployed for ambient ionization particularly for explosives detection in security applications.
=== Sources === Philippe Jaussaud; Édouard-Raoul Brygoo (2004). Du Jardin au Muséum. Archives (in French). Paris: Muséum national d'histoire naturelle. p. 630. ISBN 978-2-85653-565-3. Annuaire et sites du Muséum national d'histoire naturelle, 40 p., MNHN, Paris, rééditions décennales. Ghislaine Prévos, Service documentation du Département des Galeries du Muséum national d'histoire naturelle, annuaire biographique du personnel.
As of 2020, normal ALP levels were "not well defined", and there tend to be variations by sex and racial background, and by age, with children and adolescents having markedly higher levels. There are many possible explanations for elevated ALP. When the cause is unclear, isoenzyme studies using electrophoresis can confirm the source of the increase. Skelphosphatase (which is localized in osteoblasts and extracellular layers of newly synthesized matrix) is released into circulation by a yet unclear mechanism. Placental alkaline phosphatase is elevated in seminomas and active forms of rickets, as well as in the following diseases and conditions: Biliary obstruction Bone conditions Osteoblastic bone tumors Osteomalacia Osteoporosis Hepatitis Mononucleosis Cirrhosis Acute cholecystitis Myelofibrosis Leukemoid reaction Congestive heart failure Lymphoma Paget's disease Sarcoidosis Hyperthyroidism Hyperparathyroidism Myocardial infarction Cholangitis Ischemic cholangiopathy Pregnancy High doses of estrogens
Sources: en.wikipedia.org
== Fourth round proper == The draw for the fourth round was made on 8 January 2023, consisting of the 32 winners from the previous round. The round included one team from the fifth tier, the lowest-ranked team remaining in the competition: Wrexham.
=== Synthesis === Adrenochrome is readily synthesized from commercially available reagents: chloroacetic acid and catechol react in the presence of phosphoryl chloride to yield chloroacetylcatechol. After purification, chloroacetylcatechol is reacted with aqueous methylamine and treated with hydrochloric acid, yielding adrenalone hydrochloride. This is then hydrogenated to racemic adrenaline. Finally, adrenaline is oxidized to adrenochrome by an appropriate oxidizing agent such as silver oxide.
==== Binding to L7/L12 ==== L7/L12 is only a multicopy protein on the large ribosomal subunit of the bacterial ribosome that binds to certain GTPases, like Initiation Factor 2, Elongation factor-Tu, Release Factor 3, and EF-G. Specifically, the C-terminal of L7/L12 will bind to EF-G and is necessary for GTP hydrolysis.
In its most discriminating form, genetic fingerprinting can uniquely discriminate any one person from the entire population of the world. Minute samples of DNA can be isolated from a crime scene and compared to that from suspects or from a DNA database of earlier evidence or convicts. Simpler versions of these tests are often used to rapidly rule out suspects during a criminal investigation. Evidence from decades-old crimes can be tested, confirming or exonerating the people originally convicted. Forensic DNA typing has been an effective way of identifying or exonerating criminal suspects due to analysis of evidence discovered at a crime scene. The human genome has many repetitive regions that can be found within gene sequences or in non-coding regions of the genome. Specifically, up to 40% of human DNA is repetitive. There are two distinct categories for these repetitive, non-coding regions in the genome. The first category is called variable number tandem repeats (VNTR), which are 10–100 base pairs long, and the second category is called short tandem repeats (STR), and these consist of repeated 2–10 base pair sections. PCR is used to amplify several well-known VNTRs and STRs using primers that flank each of the repetitive regions. The sizes of the fragments obtained from any individual for each of the STRs will indicate which alleles are present. By analyzing several STRs for an individual, a set of alleles for each person will be found that statistically is likely to be unique. Researchers have identified the complete sequence of the human genome.
Sources: en.wikipedia.org
Eli Lilly and Company, doing business as Lilly, is an American multinational pharmaceutical company headquartered in Indianapolis, Indiana, with offices in 18 countries. Its products are sold in approximately 125 countries. The company was founded in 1876 by Eli Lilly, a pharmaceutical chemist and Union army veteran during the American Civil War for whom the company was later named. The company is ranked 4th on the list of largest biomedical companies by revenue and is the most valuable pharmaceutical company worldwide. It is ranked 100th on the Fortune 500 and 138th on the Forbes Global 2000. In November 2025, the company reached a $1 trillion market capitalization, the first health-care company in the world to do so. The company's primary products are tirzepatide (Mounjaro and Zepbound) for the treatment of type 2 diabetes, weight loss, and obstructive sleep apnea (56% of 2025 revenues); abemaciclib (Verzenio) for the treatment of advanced or metastatic breast cancers (9% of 2025 revenues); dulaglutide (Trulicity) for the treatment of type 2 diabetes (7% of 2025 revenues); ixekizumab (Taltz) for the treatment of autoimmune diseases (6% of 2025 revenues); and empagliflozin (Jardiance) for the treatment of type 2 diabetes (5% of 2025 revenues).
==== Immunomodulators ==== Baricitinib (Olumiant) – oral – alopecia areata – Janus kinase 1 inhibitor, Janus kinase 2 inhibitors, TYK2 kinase inhibitor Deuruxolitinib (Leqselvi) – oral – alopecia areata – Janus kinase 1 inhibitor, Janus kinase 2 inhibitor Ritlecitinib (Litfulo) – oral – alopecia areata – Emt protein-tyrosine kinase inhibitor, Janus kinase 3 inhibitor
==== New Zealand ==== Sildenafil was reclassified in New Zealand in 2014 so it could be bought over the counter from a pharmacist. It is thought that this reduced sales over the Internet and was safer as males could be referred for medical advice if appropriate.
Vitamin D: insufficiency is common in diabetics. Observational studies show that serum vitamin D is inversely associated with biomarkers of diabetes; impaired insulin secretion, insulin resistance, and glucose intolerance. It has been suggested that vitamin D may induce beneficial effects on diabetic complications by modulating differentiation and growth of pancreatic β-cells and protecting these cells from apoptosis, thus improving β-cells functions and survival. In particular, vitamin D supplementation has been shown to have positive effects on people with type 1 diabetes. Vitamin D has also been suggested to act on immune system and modulate inflammatory responses by influencing proliferation and differentiation of different immune cells., Moreover, deficiency of vitamin D may contribute to diabetic complications by inducing hyperparathyroidism, since elevated parathyroid hormone levels are associated with reduced β-cells function, impaired insulin sensitivity, and glucose intolerance. Finally, vitamin D may reduce the risk of vascular complications by modulating lipid profile. Antioxidants may have beneficial effects on diabetic complications by reducing blood pressure, attenuating oxidative stress and inflammatory biomarkers, improving lipid metabolism, insulin-mediated glucose disposal, and by enhancing endothelial function. Vitamin C has been proposed to induce beneficial effects by two other mechanisms.
== Background == Following the signing of the Pretoria Agreement in November 2022, the Interim Regional Administration of Tigray was established as a transitional governing body intended to stabilize the war-torn region. However, implementation of the peace deal stagnated over unresolved constitutional territories (such as Western Tigray), delays in disarming and reintegrating forces, and the failure to return nearly one million internally displaced persons (IDPs). Tensions escalated dramatically in early 2026 when the federal government under Prime Minister Abiy Ahmed unilaterally extended the mandate of the TIA by one year and suspended voting in 30 Tigrayan constituencies, excluding the region from the June 2026 national elections. Concurrently, a severe political fracture emerged within Tigray between TPLF officials and TIA leadership regarding the pace and direction of the post-war transition.
Sources: en.wikipedia.org
No. It is a laboratory-made analog of growth hormone-releasing hormone. The natural hormone is a 44-residue peptide, while the analog is built on a shorter 29-residue fragment.
The original material included a linker that binds serum albumin. A later variant removed that linker to reduce the duration of action. Catalogs and papers did not consistently adopt separate names, so both remain widely labeled with the same term.
The amino acid sequence and the presence or absence of the linker group. Mass measured by spectrometry gives an independent check that separates the two forms.
It acts on the growth hormone-releasing hormone receptor found on pituitary somatotroph cells. Activation of that receptor triggers growth hormone release through a cyclic AMP dependent pathway.