lyophilized powder comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-03-29. Numbers and descriptions here follow the published literature rather than marketing material.
CJC-1295 belongs to a family of synthetic peptides modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound is built from the first twenty-nine amino acids of the natural human sequence, a fragment that retains full receptor binding capacity. Native growth hormone-releasing hormone is degraded quickly in circulation, so the fragment alone has limited practical value. Early work therefore focused on chemical modifications that preserve receptor binding while slowing enzymatic breakdown. The result is a molecule described in the literature as a long-acting analog of the natural hormone.
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.
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 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.
| 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 |
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.
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.
However, melting temperature and the overall shape of the melting curve become informative. For amplicons >c.150bp there are often >2 melting peaks, each of which can vary, depending on the DNA template composition. Numerous investigators have been able to successfully eliminate the majority of their sequencing through melt-based scanning, allowing accurate locus-based genotyping of large numbers of individuals. Many investigators have found scanning for mutations using high resolution melting as a viable and practical way to study entire genes.
In 1996, the FDA removed all restrictions from aspartame, allowing it to be used in all foods. As of May 2023, the FDA stated that it regards aspartame as a safe food ingredient when consumed within the acceptable daily intake level of 50 mg per kg of body weight per day. Several European Union countries approved aspartame in the 1980s, with EU-wide approval in 1994. The Scientific Committee on Food (SCF) reviewed subsequent safety studies and reaffirmed the approval in 2002. The European Food Safety Authority (EFSA) reported in 2006 that the previously established acceptable daily intake (ADI) was appropriate, after reviewing yet another set of studies.
Similarly, China permits nationals of non—visa-exempt ASEAN countries to visit Guilin without a visa for a maximum of 6 days if they travel with an approved tour group and enter China from Guilin Liangjiang International Airport. They may not visit other cities within Guangxi or other parts of mainland China. Neither the People's Republic of China nor the Republic of China recognises the passports issued by the other, and neither considers travel between mainland China and areas controlled by the Republic of China as formal international travel. There are arrangements in place for travel between territories controlled by the Republic of China and territories controlled by the People's Republic of China. More generally, authorities in mainland China maintain a system of residency registration known as hukou (Chinese: 户口; lit. 'household individual'), by which government permission is needed to change one's place of residence formally. It is enforced using identity cards. This system of internal border control measures effectively limited internal migration before the 1980s, but subsequent market reforms caused it to collapse as a means of migration control. An estimated 150 to 200 million people are part of the "blind flow" and have unofficially migrated, generally from poor rural areas to wealthy urban areas. However, unofficial residents are often denied official services such as education and medical care and are sometimes subject to both social and political discrimination.
Strategic Air Command (1946–1992) SACAT – (a) Semi Attended Customer Activated Terminal (Supermarket checkout) SACEUR – (p) Supreme Allied Commander EURope SACF - Semi Automatic Capsule Filler source SACLANT – (p) Supreme Allied Commander atLANTic SACLOS – (a) Semi-Automatic Command to Line of Sight SAD (s) Safford Regional Airport (IATA code) (a) Seasonal Affective Disorder Situational Awareness Display SADD – (a) originally Students Against Drunk Driving, now Students Against Destructive Decisions (U.S.
For a definitive diagnosis to be made, symptoms must occur within 6 hours of transfusion, hypoxemia must be present, there must be radiographic evidence of bilateral infiltrates and there must be no evidence of left atrial hypertension (fluid overload). It occurs in 15% of the transfused patient with mortality rate of 5 to 10%. Recipient risk factors includes: end-stage liver disease, sepsis, haematological malignancies, sepsis, and ventilated patients. Antibodies to human neutrophil antigens (HNA) and human leukocyte antigens (HLA) have been associated with this type of transfusion reaction. Donor's antibodies interacting with antigen positive recipient tissue result in release of inflammatory cytokines, resulting in pulmonary capillary leakage. The treatment is supportive. Transfusion associated circulatory overload (TACO) is a common, yet underdiagnosed, reaction to blood product transfusion consisting of the new onset or exacerbation of three of the following within 6 hours of cessation of transfusion: acute respiratory distress, elevated brain natriuretic peptide (BNP), elevated central venous pressure (CVP), evidence of left heart failure, evidence of positive fluid balance, and/or radiographic evidence of pulmonary vascular congestion. Patients with congestive heart failure or kidney disease are more susceptible to volume overload. For especially vulnerable patients, a standard RBC unit could be split by sterile technique in the blood bank and administered over 8 hours instead of the standard 4 hours.
Sources: en.wikipedia.org
=== Recombinant human growth hormone (rHGH) === In 1981, the new American corporation Genentech, after collaboration with Kabi, developed and started trials of recombinant human growth hormone (rHGH) made by a new technology (recombinant DNA) in which human genes were inserted into bacteria so that they could produce unlimited amounts of the protein. Because this was new technology, approval was deferred as lengthy safety trials continued over the next four years. In 1985, four young adults in the U.S. having received NPA growth hormone in the 1960s developed CJD (Creutzfeldt–Jakob disease). The connection was recognized within a few months, and use of human pituitary GH rapidly ceased. Between 1985 and 2003, a total of 26 cases of CJD occurred in adults having received NPA GH before 1977 (out of 7700), comparable numbers of cases occurred around the world. By 2003 there had been no cases in people who received only GH purified by the improved 1977 methods. Discontinuation of human cadaver growth hormone led to rapid Food and Drug Administration approval of Genentech's recombinant human growth hormone, which was introduced in 1985 as Protropin in the United States. Although this previously scarce commodity was suddenly available in "bucketfuls", the price of treatment (US$10,000–30,000 per year) was the highest at the time. Genentech justified it by the prolonged research and development investment, orphan drug status, and a pioneering post-marketing surveillance registry for tracking safety and effectiveness (National Cooperative Growth Study).
At the outbreak of the Second World War, the Indian Army numbered 205,000 men and, as the war continued, this would rise to 2.5 million men to become the largest all–volunteer force in history. During this process, six corps would be raised; which consisted of the Indian III Corps, Indian IV Corps, Indian XV Corps, Indian XXI Corps (served with Tenth Army in the Middle East in 1942), Indian XXXIII Corps and Indian XXXIV Corps. Furthermore, the 2nd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th, 14th, 17th, 19th, 20th, 21st, 23rd, 25th, 26th, 34th, 36th (later converted to an all-British formation), and 39th Indian Divisions were formed, as well as other forces. Additionally there were at one time or another four armoured divisions formed (the 31st, 32nd, 43rd, and 44th), and one airborne division, also designated the 44th. In matters of administration, weapons, training, and equipment, the Indian Army had considerable independence; for example, prior to the war the Indian Army adopted the Vickers–Berthier (VB) light machine gun instead of the Bren gun of the British Army, while continuing to manufacture and issue the older SMLE No. 1 Mk III rifle during the Second World War, instead of the Lee–Enfield No.4 Mk I issued to the British Army from the middle of the war. Particularly notable contributions of the Indian Army during that conflict were the:
=== In the enteric nervous system (ENS) === First characterisations of aSyn aggregates in the ENS of PD patients has been performed on autopsied specimens in the late 1980s. It is yet unknown if the microbiome changes associated with PD are consequential to the illness process or main pathophysiology, or both. Individuals diagnosed with various synucleinopathies often display constipation and other GI dysfunctions years prior to the onset of movement dysfunction. Abnormal misfolding and aggregation of alpha-synuclein in the enteric nervous system and its correlation with gut dysbiosis, have been reported in the literature. Alpha synuclein potentially connects the gut-brain axis in Parkinson's disease patients. Common inherited Parkinson disease is associated with mutations in the alpha-synuclein (SNCA) gene. In the process of seeded nucleation, alpha-synuclein acquires a cross-sheet structure similar to other amyloids. The Enterobacteriaceae, which are quite common in the human gut, can create curli, which are functional amyloid proteins. The unfolded amyloid CsgA, which is secreted by bacteria and later aggregates extracellularly to create biofilms, mediates adherence to epithelial cells, and aids in bacteriophage defense, forms the curli fibers. Oral injection of curli-producing bacteria can also boost formation and aggregation of the amyloid protein Syn in old rats and nematodes. Host inflammation responses in the intestinal tract and periphery are modulated by curli exposure.
As a result, the royalist cause began to collapse in the Americas. Over the course of the next decade, the Patriots' armies won major victories and obtained independence in their respective countries. Spain did not change the position against separatism, but the political instability in Spain, without a navy, army or treasury, convinced many Spanish Americans of the need to formally establish independence from the metropole. In Spain, a French army of the Holy Alliance invaded and supported the absolutists, restored Ferdinand VII, and occupied Spain until 1828.
Sources: en.wikipedia.org
One of the most prominent campaigners was a young man from East Germany called Rudi Dutschke who also criticised the forms of capitalism that were to be seen in West Berlin. Just before Easter 1968, a young man tried to kill Dutschke as he bicycled to the student union, seriously injuring him. All over West Germany, thousands demonstrated against the Springer newspapers which were seen as the prime cause of the violence against students. Trucks carrying newspapers were set on fire and windows in office buildings broken. In the wake of these demonstrations, in which the question of America's role in Vietnam began to play a bigger role, came a desire among the students to find out more about the role of the parent-generation in the Nazi era. The proceedings of the War Crimes Tribunal at Nuremberg had been widely publicised in Germany; the attorney Fritz Bauer gathered evidence on the guards of the Auschwitz concentration camp, and about twenty were put on trial in Frankfurt in 1963. Daily newspaper reports and visits by school classes to the proceedings revealed to the German public the nature of the concentration camp system, and it became evident that the Shoah was of vastly greater dimensions than the German population had believed. The term "Holocaust" for the systematic mass-murder of Jews first came into use in 1979, when a 1978 American mini-series with that name was shown on West German television. The processes set in motion by the Auschwitz trial reverberated decades later.
Resistin, also known as adipose tissue-specific secretory factor (ADSF) or C/EBP-epsilon-regulated myeloid-specific secreted cysteine-rich protein (XCP1), is a cysteine-rich peptide hormone that is derived from adipose tissue and, in humans, is encoded by the RETN gene. In primates, pigs, and dogs, resistin is secreted primarily by immune and epithelial cells, whereas in rodents, it is mainly secreted by adipose tissue. The human resistin pre-peptide consists of 108 amino acid residues, while in mice and rats it is 114 amino acids in length; the molecular weight is approximately 12.5 kDa. Resistin is classified as an adipose-derived hormone (similar to a cytokine), and its physiological role has been widely debated, particularly regarding its involvement in obesity and type II diabetes mellitus (T2DM).
Using amino acids and protein synthesis, the specific sequence in DNA of these nucleobase-pairs helps to keep and send coded instructions as genes. In RNA, base-pair sequencing helps to make new proteins that determine most chemical processes of all life forms.
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 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.