The short version of CJC-1295 fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-04-06 and is reviewed periodically as new material appears.
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.
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.
Reports on this compound commonly follow serum growth hormone and insulin-like growth factor 1 across defined time windows. Protocols differ in sampling frequency, assay platform, and participant characteristics, which makes direct comparison between publications difficult. Some work focuses on pulsatile release patterns instead of average concentrations. Whether repeated exposure alters endogenous hormone rhythms over long periods remains an open question, and the formal literature is thinner than the volume of informal commentary implies.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C152H252N44O42 | Cited for the form without the drug affinity complex |
| Molecular weight | About 3368 Da | Reported value for modified GRF(1-29) |
| Appearance | White to off-white powder | Lyophilised solid as usually supplied |
| Solubility | Soluble in water and polar solvents | Clarity depends on purity and salt content |
| Typical storage | -20 C or below, dry | Protect from light and repeated warming cycles |
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.
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.
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.
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.
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.
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.
The protest demonstration soon erupted into a riot; the crowd took to the streets, placing the capital, like Timișoara, in turmoil. Members of the crowd spontaneously began shouting anti-Ceaușescu slogans, which spread and became chants: "Jos dictatorul!" ("Down with the dictator"), "Moarte criminalului!" ("Death to the criminal"), "Noi suntem poporul, jos cu dictatorul!" ("We are the people, down with the dictator"), "Ceaușescu cine ești?/Criminal din Scornicești" ("Ceaușescu, who are you? A criminal from Scornicești").
== Strategies == Before designing a distribution system, the supplier needs to determine what distribution channel to achieve in broad terms. The approach to distributing products or services depends on a number of factors including the type of product, especially perishability; the market served; the geographic scope of operations and the firm's overall mission and vision. The process of setting out a broad statement of the aims and objectives of a distribution channel is a strategic level decision.
Active sonar uses the reflection of sound emitted from the search equipment to detect submarines. It has been used since WWII by surface ships, submarines and aircraft (via dropped buoys and helicopter "dipping" arrays), but it reveals the emitter's position, and is susceptible to counter-measures. A concealed military submarine is a real threat, and because of its stealth, can force an enemy navy to waste resources searching large areas of ocean and protecting ships against attack. This advantage was vividly demonstrated in the 1982 Falklands War when the British nuclear-powered submarine HMS Conqueror sank the Argentine cruiser General Belgrano. After the sinking the Argentine Navy recognized that they had no effective defense against submarine attack, and the Argentine surface fleet withdrew to port for the remainder of the war. An Argentine submarine remained at sea, however.
Blood sugar regulation is the process by which the level of blood sugar, the common name for glucose dissolved in blood plasma, is maintained by the body within a narrow range. This tight regulation is referred to as glucose homeostasis. Insulin, which lowers blood sugar, and glucagon, which raises it, are the most well known of the hormones involved, but more recent discoveries of other glucoregulatory hormones have expanded understanding of this process. The pancreas gland secretes two hormones that are primarily responsible for regulation of glucose levels in blood. Blood sugar levels are regulated by negative feedback in order to keep the body in balance. The levels of glucose in the blood are monitored by many tissues, but the cells in the pancreatic islets are among the most well understood and important. Granule docking is an important glucose-dependent step in human insulin secretion that does not work properly in type 2 diabetes.
Sources: en.wikipedia.org
Although phosphorus (15P) has 22 known isotopes from 26P to 47P, only 31P is stable; Phosphorus is thus considered a monoisotopic element. 31P is also the only naturally occurring isotopes of phosphorus, so phosphorus is considered a mononuclidic element as well. The longest-lived radioactive isotopes are 33P with a half-life of 25.35 days and 32P with a half-life of 14.269 days. All others have half-lives of under 2.5 minutes, most under a second.
Canagliflozin/metformin, sold under the brand name Vokanamet among others, is a fixed-dose combination anti-diabetic medication used for the treatment of type 2 diabetes. It is used in combination with diet and exercise. It is taken by mouth. The most common side effects include hypoglycemia (low blood glucose levels) when used in combination with insulin or a sulphonylurea and vulvovaginal candidiasis (thrush, a fungal infection of the female genital area caused by Candida). Canagliflozin/metformin was approved for medical use in the European Union in April 2014, and for use in the United States in August 2014.
There is great variation in the carbon isotope composition of amino acids within a single organism. In cyanobacteria, Macko et al. observed a ~30‰ range in δ13C values amongst the amino acids. Amino acids produced from the same precursors also had widely varying compositions. It is difficult to explain these trends because of limited data on the kinetic isotope effects associated with reactions that synthesize amino acid carbon skeletons. Nevertheless, some insights can be gained by applying the logic above to the reaction networks responsible for amino acid biosynthesis. Consider the amino acids synthesized from pyruvate. Pyruvate is produced during glycolysis and can be decarboxylated by pyruvate dehydrogenase to generate acetyl groups. These acetyl groups enter the citric acid cycle as acetyl-CoA or can be used to synthesize lipids. There is a large kinetic isotope effect associated with this reaction, so the remaining pyruvate pool becomes enriched in 13C relative to the acetyl groups. This enriched pyruvate can be transaminated to produce alanine. In the experiments by Macko et al., alanine indeed had a δ13C value slightly higher than that of cyanobacterial photosynthate. Valine is synthesized by the addition of a 13C depleted acetyl group to pyruvate. Consistent with this mechanism, Takano et al. found valine to be depleted in 13C relative to alanine in anaerobic methanotrophic archaea. However, in cyanobacteria, Macko et al. observed a higher δ13C value for valine than alanine.
Sources: en.wikipedia.org
Barbara Seliger Larsen is a mass spectrometrist, with a career in instrumentations and applications of mass spectrometry in industry, and served on the board of the American Society for Mass Spectrometry for several terms.
=== March === March 1 2026 Austin bar shooting: Four people are killed, including the perpetrator, and 15 others are injured in a mass shooting at a bar in Austin, Texas. The FBI investigates the attack as potential terrorism, with the possible motive being linked to the U.S. strikes on Iran. 2026 attack on the United States consulate in Karachi: In Karachi, Pakistan, protesters supportive of the Iranian government attempt to storm the U.S. consulate. The Marine Security Guard opened fire, killing several protesters. March 2 The U.S. military reports that three of its fighter jets crashed in Kuwait due to an "apparent friendly fire incident," but all six crew members ejected safely. Iran strikes the American embassy in Saudi Arabia. March 3 Six U.S. soldiers are reported to have died when an "unmanned aircraft system" evaded air defenses to hit a command centre in Port Shuaiba, Kuwait. These are the first American troops killed in the Iran War. Trump orders Treasury Secretary Bessent to "cut off all dealings" with Spain, after Spain refuses to grant the U.S. permission to use jointly operated bases to continue its attacks in Iran. March 4 – Defense Secretary Hegseth announces that a U.S. submarine has sunk an Iranian naval frigate in the Indian Ocean with a single Mark 48 torpedo, the first such sinking of an enemy ship since World War II. The Sri Lankan navy reports the IRIS Dena went down in the Indian Ocean, with 140 people on board missing. On the same day, the U.S. House Ethics Committee launches a formal investigation into Tony Gonzales.
. It is used as a measure of affinity, with higher values indicating a lower affinity. For the given equation (E = enzyme, S = substrate, P = product), E + S ⟺ k − 1 k 1 E S ⟺ k 2 E + P {\displaystyle E+S{\overset {k_{1}}{\underset {k_{-}{1}}{\Longleftrightarrow }}}ES{\overset {k_{2}}{\Longleftrightarrow }}E+P} k d {\displaystyle k_{d}} would be equivalent to k − 1 / k 1 {\displaystyle k_{-1}/k_{1}} , where k 1 {\displaystyle k_{1}} and k − 1 {\displaystyle k_{-1}} are the rates of the forward and backward reaction, respectively in the conversion of individual E and S to the enzyme substrate complex. Information theory allows for a more quantitative definition of specificity by calculating the entropy in the binding spectrum. The chemical specificity of an enzyme for a particular substrate can be found using two variables that are derived from the Michaelis-Menten equation. k m {\displaystyle k_{m}} approximates the dissociation constant of enzyme-substrate complexes. k c a t {\displaystyle k_{cat}}
A few long-lived actinide isotopes, such as 244Pu and 250Cm, cannot be produced in reactors because neutron capture does not happen quickly enough to bypass the short-lived beta-decaying nuclides 243Pu and 249Cm; they can however be generated in nuclear explosions, which have much higher neutron fluxes.
Sources: en.wikipedia.org
It is a synthetic peptide analogue of growth hormone-releasing hormone. Four substitutions in its sequence make it more resistant to enzymatic degradation than the natural hormone. In the version carrying a drug affinity complex, the peptide binds albumin and remains in circulation for days.
No regulatory agency has approved CJC-1295 for clinical use. Human trials were conducted in the 2000s, but the development programme was discontinued before any marketing application succeeded. Material sold today is offered as a research chemical, and its purity depends on the supplier.
Sermorelin is an unmodified fragment of growth hormone-releasing hormone and is cleared quickly. CJC-1295 contains substitutions that resist breakdown, and the form with a drug affinity complex persists much longer. Both act at the same receptor but differ substantially in duration of action.
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.