This is a working overview of DAC, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-31. Anything still debated is marked as such rather than presented as settled.
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.
The core sequence keeps the receptor-binding region of GHRH while replacing four positions that are vulnerable to dipeptidyl peptidase-4 and other proteases. Substitutions at positions 2, 8, 15, and 27 raise metabolic stability relative to the natural hormone. The N-terminal residues remain essential for activity, so changes there generally lower potency. Molecular weight sits near 3368 daltons for the tetrasubstituted analog without the linker, while the albumin-binding form is heavier because of the added maleimide group.
CJC-1295 is a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. Its sequence corresponds to the first twenty-nine residues of human GHRH, with four substitutions that slow enzymatic breakdown. Early descriptions placed the compound in research on growth hormone deficiency and related conditions, and later literature groups it with the long-acting GHRH analogs. The name appears in both laboratory and popular fitness writing, where it sometimes labels chemically different peptides.
Two related peptides circulate under the CJC-1295 label, and they differ mainly in how long they persist in circulation. The version carrying a drug affinity complex includes a maleimidopropionic acid linker that forms a covalent bond with serum albumin. The other version, usually written as modified GRF(1-29) or tetrasubstituted GRF(1-29), lacks that linker and is cleared quickly. Mixing the two produces inconsistent readings of published half-life values, because the linker rather than the receptor-facing sequence drives most of the difference.
| 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 |
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.
Stability depends heavily on physical state. A lyophilized powder kept dry, desiccated, and shielded from light typically holds its integrity for months to years at minus twenty degrees Celsius, and longer at minus eighty. Once dissolved, the peptide becomes far more vulnerable, since peptide bond hydrolysis, oxidation of susceptible residues, and aggregation all proceed faster in solution. Buffers near neutral pH are generally gentler than strongly acidic or alkaline conditions. Repeated freeze-thaw cycles and exposure to air-liquid interfaces during vigorous mixing cause losses that are easy to overlook.
The compound emerged from work at a Canadian biotechnology firm in the early 2000s. Early human studies examined its effect on growth hormone and insulin-like growth factor 1 in healthy volunteers and in people with HIV-associated fat redistribution. Reports described sustained increases in both markers after a single injection. Development did not advance to regulatory approval, and the clinical programme was later discontinued. The molecule is now encountered mainly as a research chemical rather than a marketed medicine.
Two forms circulate in research settings and are frequently confused. One carries the drug affinity complex and is often written as CJC-1295 with DAC; the other lacks that group and is usually called modified GRF(1-29). The two share the same core sequence but differ sharply in how long they persist in blood. Products labelled only as CJC-1295 normally refer to the version carrying the complex. Documentation that omits the distinction leaves the intended molecule ambiguous.
CJC-1295 is a synthetic peptide built as a long-acting analogue of growth hormone-releasing hormone. Its backbone matches the first twenty-nine residues of the natural human hormone, with four amino acid substitutions added to slow enzymatic breakdown. A reactive maleimide group, commonly termed the drug affinity complex, allows the peptide to attach to circulating albumin after administration. That albumin attachment keeps the molecule in the bloodstream for an extended period instead of being cleared within minutes.
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.
Anwar's conviction drew criticism from the international community. US Secretary of State Madeleine Albright defended Anwar as a "highly respectable leader" who was "entitled to due process and a fair trial" and met with Anwar's wife, Wan Azizah Wan Ismail. Wan Azizah had formed a liberal opposition party, the National Justice Party (Keadilan) to contest in the 1999 election. UMNO lost 18 seats and two state governments. By July 2001, Mahathir had reached his 20th year in power but discouraged grand celebrations. Around the same time, Mahathir established the Women's Affairs Ministry and proposed an amendment to Article 8(2) of the Federal Constitution to include "sex" as a prohibited ground for discrimination, ensuring women's equal rights. He also launched Puteri Umno, urging party members to support and nurture the new women's wing. In May 2002, Mahathir officially opened the PETRONAS Petroleum Industry Complex (PPIC) in Kerteh, a world-class integrated petroleum hub developed by Petronas that attracted significant foreign investment. During the same time, he also approved Malaysian Chinese Association (MCA) President Ling Liong Sik's proposal to establish Universiti Tunku Abdul Rahman (UTAR). During his tenure, Mahathir proposed sending a Malaysian into space, and on 7 August 2003, he officially announced the astronaut programme. This initiative came to fruition in 2007, when Sheikh Muszaphar Shukor became the first Malaysian astronaut to travel to the International Space Station aboard a Soyuz spacecraft under an arrangement with Russia.
viticella) and its cultivars). Montana Group: Cultivars belonging to, or derived from, species classified in section Montanae (Schneider) Grey-Wilson such as C. chrysocoma, C. montana, C. spooneri. Tangutica Group: Cultivars with at least one parent belonging to, or derived from, species classified in section Meclatis (Spach) Baill., such as C. intricata, C. ladakhiana, C. orientalis, C. serratifolia, C. tangutica, C. tibetana. This Group has also been known as the Orientalis Group. Texensis Group: Cultivars derived from C. texensis crossed with representatives from either of the Large-flowered Groups. Viorna Group: Cultivars with at least one parent belonging to, or derived from, species classified in section Viorna A. Gray, such as C. crispa, C. fusca, C. ianthina, C. pitcheri, C. reticulata, C. texensis, C. viorna. Cultivars assigned to Texensis Group, and cultivars with C. integrifolia in their parentage, are excluded. Vitalba Group: Cultivars with at least one parent belonging to, or derived from, species classified in section Clematis L., such as C. ligusticifolia, C. potaninii, C. vitalba, C. virginiana. Viticella Group: Cultivars with at least one parent mainly derived from C. viticella. Excludes hybrids between C. integrifolia and C. viticella: see Integrifolia Group. Large-flowered Division: Flowers (5–)10–22(–29) cm across, usually flat. Early Large-flowered Group: Comprises the former Patens Group and Fortunei Group. Cultivars of the Patens Group were derived mainly from C. patens, either directly or indirectly.
Mistaken diagnoses are sometimes very serious problems as physicians concentrate on treatment after a diagnosis is reached, not retracing the diagnostic analysis. Ideally, diagnoses are always correct, but disease variations are such that they are sometimes in error. In the case of diabetes, the tests are very clear. If you do not have high blood glucose at times (e.g., when fasting), you should not be diagnosed as diabetic, though perhaps as "prediabetic". Every one has higher glucose levels for one or two hours after eating food which contains some types of carbohydrates. Dialysis providing kidney function artificially. This requires an artificial kidney (a dialysis machine) and relatively long periods hooked up to the machine every few days. It is not equivalent to a working kidney, but is sufficient to maintain life, sometimes for extended periods. Diastolic blood pressure See: Blood pressure. Diet plan See: Meal plan. Dietitian An expert in nutrition who helps people with special health needs plan the kinds and amounts of foods to eat. In the US, a registered dietitian (R.D.) has special training and experience. The health care team for diabetes should ideally include a dietitian, preferably an R.D. Dilated pupil examination A necessary part of an examination for diabetic eye disease. Special drops are used to enlarge the pupils, enabling the doctor to view the retina at the back of the eye for damage. See funduscopy. Distal sensory neuropathy See: Peripheral neuropathy.
From Greek βίος (bíos) 'life', (from Proto-Indo-European root *gwei-, to live) and λογία (logia) 'study of'. The compound appears in the title of Volume 3 of Michael Christoph Hanow's Philosophiae naturalis sive physicae dogmaticae: Geologia, biologia, phytologia generalis et dendrologia, published in 1766. The term biology in its modern sense appears to have been introduced independently by Thomas Beddoes (in 1799), Karl Friedrich Burdach (in 1800), Gottfried Reinhold Treviranus (Biologie oder Philosophie der lebenden Natur, 1802) and Jean-Baptiste Lamarck (Hydrogéologie, 1802).
== Predicted properties == Very few properties of bohrium or its compounds have been measured; this is due to its extremely limited and expensive production and the fact that bohrium (and its parents) decays very quickly. A few singular chemistry-related properties have been measured, but properties of bohrium metal remain unknown and only predictions are available.
Sources: en.wikipedia.org
=== Medical specialty === The beginning of psychiatry as a medical specialty is dated to the middle of the nineteenth century, although its germination can be traced to the late eighteenth century. In the late 17th century, privately run asylums for the insane began to proliferate and expand in size. In 1713, the Bethel Hospital Norwich was opened, the first purpose-built asylum in England. In 1656, Louis XIV of France created a public system of hospitals for those with mental disorders, but as in England, no real treatment was applied. During the Enlightenment, attitudes towards the mentally ill began to change. It came to be viewed as a disorder that required compassionate treatment. In 1758, English physician William Battie wrote his Treatise on Madness on the management of mental disorder. It was a critique aimed particularly at the Bethlem Royal Hospital, where a conservative regime continued to use barbaric custodial treatment. Battie argued for a tailored management of patients entailing cleanliness, good food, fresh air, and distraction from friends and family. He argued that mental disorder originated from dysfunction of the material brain and body rather than the internal workings of the mind.
=== Tenerife === Upon landing on Tenerife, Humboldt and Bonpland were received by local officials and noted the distinctive flora of the island, including bananas, papaws, and ornamental plants. On June 20, before dawn,Bonpland an Humboldt departed with guides and mules for La Orotava, near the Teide volcano. They passed through San Cristébal, built on a basalt ridge around the Peak of Tenerife, and paused to inspect rocks, eventually arriving at La Laguna, the capital of Tenerife. After the climbing Humboldt and his party left La Laguna, traversing a landscape rich in plant diversity, including palms, orange trees, vines, and cacti. The region’s natural beauty was contrasted by socio-economic inequality, with land concentrated among a few wealthy planters and the indigenous population living in poverty. The group passed through Juan de la Rambla, Victoria, and Matanza, sites of both agricultural abundance and historical conflict with Spanish conquest in the fifteenth century. In La Orotava, they visited the botanical garden and met Monsieur LeGros, the French vice-consul, who had lived on Tenerife since being shipwrecked and agreed to guide their ascent of Pico del Teide. On 21 June 1799, the climbing party, which included LeGros, other local guides, and consular staff, departed for the volcano. The route passed solidly built but somber towns, lush gardens, and a renowned dragon tree, a species present in the Canaries but native to the West Indies, illustrating the complexities of plant distribution.
According to Wayman, these two are: (1) the general principle of dependent origination itself, its nidanas and their relationships and (2) how it deals with the particular process of the rebirth of sentient beings.
== Bibliography == Move That Mountain (1976), ISBN 978-0-88270-164-6 Eight Keys to Success (1980), ISBN 978-0-89221-071-8 I Was Wrong (1996), ISBN 978-0-7852-7425-4 Prosperity and the Coming Apocalypse (1998), ISBN 978-1-4185-5422-4 The Refuge: The Joy of Christian Community in a Torn-Apart World (2000), ISBN 978-1-4185-5423-1 Time Has Come: How to Prepare Now for Epic Events Ahead (2014), ISBN 978-1-61795-134-3 You Can Make It: God's Faithfulness in Dark Times-Past, Present and Future (2021), ISBN 978-1-63641-047-0
AlphaFold 1 (2018) was built on work developed by various teams in the 2010s, work that looked at the large databases of related protein sequences now available from many different organisms (most without known 3D structures), to try to find changes at different residues (peptides) that appeared to be correlated, even though the residues were not consecutive in the main chain. Such correlations suggest that the residues may be close to each other physically, even though not close in the sequence, allowing a contact map to be estimated. Building on recent work prior to 2018, AlphaFold 1 extended this by estimating a probability distribution for the distances between residues, effectively transforming the contact map into a distance map. It also used more advanced learning methods than previously to develop the inference. The code was not made publicly available, except to run on sequences of proteins in the 2018 CASP competition.
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.
Natural GHRH is degraded quickly by dipeptidyl peptidase-4 and related enzymes, giving it a half-life measured in minutes. CJC-1295 carries substitutions that slow that breakdown, so it stays intact longer. Both act at the same pituitary receptor and produce the same class of signal.