If you have been reading about DAC and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-09-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
CJC-1295 is a synthetic peptide designed as a long-acting analogue of growth hormone-releasing hormone (GHRH). Its structure derives from the first 29 amino acids of native GHRH, a fragment often called GRF(1-29). Four substitutions were introduced to slow enzymatic breakdown and extend activity relative to the natural sequence. The compound was developed by ConjuChem as part of a broader effort to improve the pharmacokinetic profile of peptide hormones. It is studied in laboratory and clinical research settings rather than appearing as a naturally occurring substance.
Two related forms circulate in technical discussion under the same family name. The original version carries a drug affinity complex (DAC) that binds covalently to serum albumin after administration, and this linkage substantially extends circulation time. A second form, frequently written as modified GRF(1-29) or CJC-1295 without DAC, lacks that linker and clears much faster. The naming is a frequent source of confusion because the shorthand CJC-1295 can refer to either form depending on the source. Reports sometimes fail to specify which variant was studied.
The peptide backbone includes a D-alanine at position two, which resists cleavage by dipeptidyl peptidase IV, and several other substitutions that reduce degradation. Its molecular weight is roughly 3.4 kDa without the linker and about 3.6 kDa with it. The molecule is water soluble and is normally supplied as a lyophilized powder. Precise sequence and mass values depend on which variant is described, so technical documents usually state the exact form being referenced.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular weight (no linker) | ~3.37 kDa | Calculated from peptide sequence |
| Molecular weight (with linker) | ~3.65 kDa | Includes albumin-binding moiety |
| Appearance | White to off-white powder | Typically lyophilized |
| Solubility | Soluble in water | Also dissolves in aqueous buffers |
| Common synonyms | Modified GRF(1-29), DAC:GRF | Usage varies by source |
At the pituitary, the peptide binds the growth hormone-releasing hormone receptor on somatotroph cells. Receptor activation raises intracellular cyclic AMP and triggers release of stored growth hormone. Somatostatin and other hypothalamic signals modulate this response. Negative feedback from insulin-like growth factor 1 also influences output. The same regulatory architecture operates with the native hormone. Whether the synthetic analog alters feedback dynamics over repeated exposure remains an open question. Most published receptor work uses cell models rather than intact human systems.
CJC-1295 is a synthetic peptide belonging to the growth hormone-releasing hormone analog family. It comprises twenty-nine amino acid residues derived from the N-terminal region of natural GHRH. The molecule incorporates several non-natural substitutions that increase resistance to enzymatic degradation. These modifications extend its activity compared with the native hormone fragment. Researchers use it to study pituitary growth hormone secretion in laboratory and clinical settings. This compound is distinct from native GHRH in its stability profile.
Two principal forms appear in the literature and in research supply. One carries a drug affinity complex, a maleimide-based group that forms a covalent bond with circulating albumin. This linkage slows clearance and produces a long-lasting elevation of peptide levels. The other form lacks that group and is often labeled MOD GRF(1-29). It has a much shorter circulation time. Both variants retain the same core receptor-binding sequence. Reported half-lives differ substantially between the two.
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.
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.
Receptor level activity follows the canonical GHRH pathway. The peptide binds the GHRH receptor, a class B G protein coupled receptor on somatotroph cells of the anterior pituitary. Binding raises intracellular cyclic AMP, which promotes calcium entry and the release of growth hormone into the bloodstream. Because the molecule acts at the same receptor as the endogenous hormone, its effect is superimposed on the natural pulsatile rhythm rather than replacing it. Whether sustained receptor occupation leads to desensitization is not fully settled.
CJC-1295 belongs to a class of synthetic peptides modeled on growth hormone releasing hormone, a forty-four amino acid signal produced by the hypothalamus. The compound is built from the first twenty-nine residues of the natural sequence, with four substitutions introduced at positions 2, 8, 15 and 27. These changes were designed to slow enzymatic breakdown while preserving receptor activation. The result is a peptide that is shorter than native GHRH and considerably more resistant to ordinary clearance pathways in circulation.
== Modes of exercise therapy: trials == With the main goals of treatment being improved functionality and quality of life, exercise programs should focus on "functional" exercises (e.g. walking, walking up/down stairs, sit-to-stand), when applicable. Performing functional exercises increases (a) the efficiency of the exercise program and (b) the likelihood the improvements will be transferred to activities of daily living.
Meanwhile, Saddar Police, CTD, Elite Force and Quick Response Force destroyed militant hideouts during an operation near the Wanda Painda Khan area in Lakki Marwat District. On 8 June 2026, two militants were killed in a military operation in Garah Madah area of Daraban Tehsil. On 9 June 2026, militants attacked a Pakistani border post in Hassankhel killing six Frontier Constabulary personnel and wounding four, while three personnel were captured by the militants. A police constable was also kidnapped and a girls school was destroyed by militants in Wana. On 10 June 2026, Pakistan conducted airstrikes in Khost, Kunar and Paktika provinces of Afghanistan, with Taliban claiming that 13 civilians, including 11 children, a woman, and an elderly man had been killed and 14 wounded in these airstrikes. At least 9 people were killed after a house in Spera district was struck. In Barmal, 3 children were killed. Pakistan, however claimed that 26 TTP militants were killed in these airstrikes. Meanwhile, in Darga Saheedan area of Karak District, eight police personnel were wounded in an ambush by insurgents. On 11 June, a police constable was killed in an attack in North Waziristan and another was killed the following day. On June 11, a Government Middle School was blown up by militants in Lakki Marwat District. A TTP commander Abu Bakr and "several" militants linked to him were killed in Pakistani airstrikes on hideouts in Bannu District. A suicide bomber was killed and six TTP insurgents were killed in skirmishes with Pakistani forces in Kurram District.
== Etymology and terminology == The Oxford English Dictionary states that the Neo-Latin word clītoris likely has its origin in the Ancient Greek κλειτορίς (kleitorís), which means "little hill", and perhaps derived from the verb κλείειν (kleíein), meaning "to shut" or "to sheathe". Clitoris is also related to the Greek word κλείς (kleís), "key", "indicating that the ancient anatomists considered it the key" to female sexuality. In addition, the Online Etymology Dictionary suggests other Greek candidates for this word's etymology include a noun meaning "latch" or "hook" or a verb meaning "to touch or titillate lasciviously", "to tickle". The Oxford English Dictionary also states that the colloquially shortened form clit, the first occurrence of which was noted in the United States, has been used in print since 1958: until then, the common abbreviation was clitty. Other slang terms for clitoris are bean, nub, and love button. The term clitoris is commonly used to refer to the glans alone. In recent anatomical works, the clitoris has also been referred to as the bulbo-clitoral organ.
Following this transfer event, the electron-deficient anion undergoes internal rearrangement and fragments. NETD is the ion/ion analogue of electron-detachment dissociation (EDD). NETD is compatible with fragmenting peptide and proteins along the backbone at the Cα-C bond. The resulting fragments are usually a•- and x-type product ions.
Sources: en.wikipedia.org
Various organisations continually conduct opinion polls to gauge voter intention in anticipation of the next United Kingdom general election. The next general election must be held no later than 15 August 2029 under the Dissolution and Calling of Parliament Act 2022, which mandates that any Parliament automatically dissolves five years after it first met – unless it is dissolved earlier at the request of the prime minister – and polling day occurs no more than 25 working days later. Most of the polling companies listed are members of the British Polling Council (BPC) and abide by its disclosure rules. The dates of the polls range from the 2024 United Kingdom general election, held on 4 July, to the present.
== Climate == The climate of Stanley is classified as a subpolar oceanic climate (Köppen Cfc), bordering very closely on a polar climate (ET). Nowadays it barely avoids classification as ET because the mean temperature is greater than 10 °C (50 °F) for two months of the year. Unlike typical tundra climates, however, the winters are very mild, and vegetation grows there that normally could not in a climate this close to a polar climate. Contrast this with Churchill, Manitoba, which also has a near-tundra climate but is much more continental in nature. The Falkland Islands have displayed a warming trend in recent years; the mean daily January maximum for Mount Pleasant for the years 1999-2012 is 15.1 °C (59.2 °F) compared to Stanley's 1961-90 average of 14.1 °C (57.4 °F). Formerly, Stanley had a tundra climate (ET), due to cool summer temperatures (the mean temperature was less than 10 °C or 50 °F in the hottest month). Like the rest of the archipelago, Stanley has more or less even temperatures through the year and strong westerlies. Precipitation, averaging 544 mm (21.42 in) a year, is nonetheless relatively low, and evenly spread throughout the year. Typically, at least 1 mm (0.039 in) of rain will be recorded on 125.2 days of the year. The islands receive 36.3% of possible sunshine, or around 1500–1600 hours a year, a level similar to southern parts of England. Daytime temperatures are similar to the Northern Isles of Scotland, though nights tend to be somewhat colder, with frost occurring on more than 1 in 3 nights (128.4 nights). Snow occurs in the winter.
== Methods to study condensates == A number of experimental and computational methods have been developed to examine the physico-chemical properties and underlying molecular interactions of biomolecular condensates. Experimental approaches include phase separation assays using bright-field imaging or fluorescence microscopy, and fluorescence recovery after photobleaching (FRAP), as well as rheological analysis of phase-separated droplets. Computational approaches include coarse-grained molecular dynamics simulations and circuit topology analysis.
In the presence of acid, hemiacetals can undergo an elimination reaction, losing the oxygen atom that once belonged to the parent aldehyde’s carbonyl group. These oxonium ions are powerful electrophiles, and react rapidly with a second molecule of alcohol to form new, stable compounds, called acetals. The whole mechanism of acetal formation from hemiacetal is drawn below.
{\displaystyle {\begin{aligned}\theta :\ &\rho \left({\partial _{t}u_{\theta }}+u_{r}{\partial _{r}u_{\theta }}+{\frac {u_{\varphi }}{r\sin \theta }}{\partial _{\varphi }u_{\theta }}+{\frac {u_{\theta }}{r}}{\partial _{\theta }u_{\theta }}+{\frac {u_{r}u_{\theta }-u_{\varphi }^{2}\cot \theta }{r}}\right)\\&\quad =-{\frac {1}{r}}{\partial _{\theta }p}\\&\qquad +\mu \left({\frac {1}{r^{2}}}\partial _{r}\left(r^{2}{\partial _{r}u_{\theta }}\right)+{\frac {1}{r^{2}\sin ^{2}\theta }}{\partial _{\varphi }^{2}u_{\theta }}+{\frac {1}{r^{2}\sin \theta }}\partial _{\theta }\left(\sin \theta {\partial _{\theta }u_{\theta }}\right)+{\frac {2}{r^{2}}}{\partial _{\theta }u_{r}}-{\frac {u_{\theta }+2\cos \theta {\partial _{\varphi }u_{\varphi }}}{r^{2}\sin ^{2}\theta }}\right)\\&\qquad +{\frac {1}{3}}\mu {\frac {1}{r}}\partial _{\theta }\left({\frac {1}{r^{2}}}\partial _{r}\left(r^{2}u_{r}\right)+{\frac {1}{r\sin \theta }}\partial _{\theta }\left(u_{\theta }\sin \theta \right)+{\frac {1}{r\sin \theta }}{\partial _{\varphi }u_{\varphi }}\right)\\&\qquad +\rho g_{\theta }.\end{aligned}}}
Sources: en.wikipedia.org
The Maduro regime has violated all such principles in every respect. We stand for further developments in accordance with the principles of international law, prioritising democracy, human rights, and the interests of Venezuelans." Ukrainian President Volodymyr Zelenskyy reacted with a pointed remark to the United States' capture of Nicolás Maduro, suggesting the U.S. now "knows what to do next" when dealing with dictators. United Kingdom: Prime Minister Keir Starmer stated "The UK has long supported a transition of power in Venezuela. We regarded Maduro as an illegitimate President and we shed no tears about the end of his regime", adding "I always say and believe we should all uphold international law." He also clarified that the United Kingdom was not involved in the strikes. The Foreign Office advised against all travel to Venezuela for British citizens. South Ossetia: South Ossetia condemned the US attacks.
In Mexico, for example, the illicit trafficking of cannabis is thought to constitute the majority of many of the cartels' earnings, and the main way in which the cartels finance many other illegal activities; including the purchase of other illegal drugs for trafficking, and for acquiring weapons that are ultimately used to commit murders (causing a burgeoning in the homicide rates of many areas of the world, but particularly Latin America). Some studies show that the increased legalization of cannabis in the United States (beginning in 2012 with Washington Initiative 502 and Colorado Amendment 64) has led Mexican cartels to smuggle less cannabis in exchange for more heroin.
== Peptidase inhibitor == Iodoacetamide is an irreversible inhibitor of all cysteine peptidases, with the mechanism of inhibition occurring from alkylation of the catalytic cysteine residue (see schematic). In comparison with its acid derivative, iodoacetate, iodoacetamide reacts substantially faster. This observation appears contradictory to standard chemical reactivity, however the presence of a favourable interaction between the positive imidazolium ion of the catalytic histidine and the negatively charged carboxyl-group of the iodoacetate is the reason for the increased relative activity of iodoacetamide.
=== Interaction with ethanol === Concurrent use with ethanol is contraindicated because fomepizole is known to prolong the half-life of ethanol via inhibiting its metabolism to acetaldehyde by alcohol dehydrogenase.
Sources: en.wikipedia.org
No. It is a synthetic analogue modeled on the first 29 residues of human GHRH. The substitutions and any linker are laboratory modifications rather than features of the endogenous peptide.
Early development used the albumin-binding form, and a shorter variant was later discussed under the same label. Because the two differ in half-life and handling, ambiguity arises whenever a source omits the variant designation.
The compound derives from that fragment but is not identical to it. The parent fragment lacks the stabilizing substitutions, so its degradation rate and duration of action differ noticeably.
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.