The short version of somatotroph fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-11-27. 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.
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.
| 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 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.
CJC-1295 acts at the growth hormone-releasing hormone receptor, a G-protein-coupled receptor found on somatotroph cells in the anterior pituitary. Binding triggers a rise in cyclic AMP and calcium entry, which promotes release of stored growth hormone. Because the peptide mimics the body's own releasing hormone, it amplifies existing secretory pulses rather than driving continuous output. The size of the response therefore depends partly on the subject's own hormonal rhythm and feedback state.
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.
Wool Bradford, Halifax and Huddersfield grew through the development of woollen mills. Leeds' traditional industry was the manufacturing of cloth while heavier engineering industries facilitated growth in South Leeds. The Heavy Woollen District covered towns such as Dewsbury, Batley, Morley, Ossett, Cleckheaton and Heckmondwike. The woollen and cloth industries declined throughout the twentieth century.
=== With nitrogen species === With primary amines, thionyl chloride gives sulfinylamine derivatives (RNSO), one example being N-sulfinylaniline. Thionyl chloride reacts with primary formamides to form isocyanides and with secondary formamides to give chloroiminium ions; as such a reaction with dimethylformamide will form the Vilsmeier reagent. By an analogous process, secondary amides will react with thionyl chloride to form imidoyl chlorides, with tertiary amides giving chloroiminium ions. These species are highly reactive and can be used to catalyse the conversion of carboxylic acids to acyl chlorides; they are also exploited in the Bischler–Napieralski reaction as a means of forming isoquinolines.
Powder cocaine (cocaine hydrochloride) must be heated to a high temperature to be smoked (about 197 °C), and considerable decomposition/burning occurs at these high temperatures. This effectively destroys some of the cocaine and yields a sharp, acrid, and foul-tasting smoke. Cocaine base/crack can be smoked because it vaporizes with little or no decomposition at 98 °C (208 °F).
By the early 1980s, genes for these interferons had been cloned, adding further definitive proof that interferons were responsible for interfering with viral replication. Gene cloning also confirmed that IFN-α was encoded by a family of many related genes. The type II IFN (IFN-γ) gene was also isolated around this time. Interferon was first synthesized manually at Rockefeller University in the lab of Dr. Bruce Merrifield, using solid phase peptide synthesis, one amino acid at a time. He later won the Nobel Prize in chemistry. Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing mass cultivation and purification from bacterial cultures or derived from yeasts. Interferon can also be produced by recombinant mammalian cells. Before the early 1970s, large scale production of human interferon had been pioneered by Kari Cantell. He produced large amounts of human alpha interferon from large quantities of human white blood cells collected by the Finnish Blood Bank. Large amounts of human beta interferon were made by superinducing the beta interferon gene in human fibroblast cells. Cantell's and Tan's methods of making large amounts of natural interferon were critical for chemical characterisation, clinical trials and the preparation of small amounts of interferon messenger RNA to clone the human alpha and beta interferon genes. The superinduced human beta interferon messenger RNA was prepared by Tan's lab for Cetus.
Sources: en.wikipedia.org
== Mechanism of action == Gallium (68Ga) gozetotide binds with prostate-specific membrane antigen (PSMA). This binds to cells that express PSMA, including malignant prostate cancer cells. The radioactive isotope of gallium, 68Ga is responsible for emitting β+ radiations and X-rays. This helps in recording images by positron emission tomography (PET) and CT scan.
== Preparation == Home drying of vegetables, fruit and meat can be carried out with electrical dehydrators (household appliances) or by sun-drying or by wind. Preservatives such as potassium metabisulfite, BHA, or BHT may be used, but are not required. However, dried products without these preservatives may require refrigeration or freezing to ensure safe storage for a long time. Industrial food dehydration is often accomplished by freeze-drying. In this case, food is flash frozen and put into a reduced-pressure system which causes the water to sublimate directly from the solid to the gaseous phase. Although freeze-drying is more expensive than traditional dehydration techniques, it also mitigates the change in flavor, texture, and nutritional value. In addition, another widely used industrial method of drying of food is convective hot air drying. Industrial hot air dryers are simple and easy to design, construct and maintain. More so, it is very affordable and has been reported to retain most of the nutritional properties of food if dried using appropriate drying conditions. Hurdle technology is the combination of multiple food preservation methods. Hurdle technology uses low doses of multiple food preservation techniques in order to ensure food is not only safe but is desirable visually and texturally.
Chlorella: This form of alga is found in freshwater and contains photosynthetic pigments in its chloroplasts. Klamath AFA: A subspecies of Aphanizomenon flos-aquae found wild in many bodies of water worldwide but harvested only from Upper Klamath Lake, Oregon. Spirulina: Known otherwise as a cyanobacterium (a prokaryote or a "blue-green alga") The oils from some algae have high levels of unsaturated fatty acids. Some varieties of algae favored by vegetarianism and veganism contain the long-chain, essential omega-3 fatty acids, docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA). Fish oil contains the omega-3 fatty acids, but the original source is algae (microalgae in particular), which are eaten by marine life such as copepods and are passed up the food chain. The natural pigments (carotenoids and chlorophylls) produced by algae can be used as alternatives to chemical dyes and coloring agents. The presence of some individual algal pigments, together with specific pigment concentration ratios, are taxon-specific: analysis of their concentrations with various analytical methods, particularly high-performance liquid chromatography, can therefore offer deep insight into the taxonomic composition and relative abundance of natural algae populations in sea water samples. Carrageenan, from the red alga Chondrus crispus, is used as a thickener and stabilizer in milk products.
Sources: en.wikipedia.org
Although a majority of OECD countries protect the right of employees to vote for directors on boards of corporations (usually at least one-third), Australia has not yet passed a general law by amending the Corporations Act 2001, the Fair Work Act 2009 or state laws for worker directors. However, Australia does have board-level employee representation (or "codetermination") in occupational pensions, and several specific sectors. First, under the Hawke-Keating government Australia enacted a leading model for voice in worker's capital, now in the Superannuation Industry (Supervision) Act 1993 section 89, requiring an "equal numbers of employer representatives and member representatives" on the board of directors or trustees in a super-fund. In 2010 a proposal was made to amend this for so called "independent directors" to be required to take the balance of power, appointed by the incumbent board, even though the evidence suggested this would be a step backwards. No changes were passed. There is not yet express legislation to require that asset managers, to whom investment and shareholder voting was outsourced, must follow the voting policies set by elected representatives on superannuation fund boards, as is found in Switzerland.
Scotch whisky (Scottish Gaelic: uisge-beatha na h-Alba; Scots: whisky/whiskie [ˈʍɪski] or whusk(e)y [ˈʍʌski]), often simply called whisky or Scotch, is malt whisky or grain whisky (or a blend of the two) made in Scotland. The first known written mention of Scotch whisky is in the Exchequer Rolls of Scotland of 1494. All Scotch whisky was originally made from malted barley. Commercial distilleries began introducing whisky made from wheat and rye in the late 18th century. As of June 2026, there were 154 whisky distilleries operating in Scotland, making Scotch whisky one of the most renowned geographical indications worldwide. All Scotch whisky must be aged immediately after distillation in oak barrels for at least three years. Any age statement on a bottle of Scotch whisky, expressed in numerical form, must reflect the age of the youngest whisky used to create that product. A whisky with an age statement is known as guaranteed-age whisky. A whisky without an age statement is known as a no age statement (NAS) whisky, the only guarantee being that all whisky contained in that bottle is at least three years old. The minimum bottling strength according to existing regulations is 40% alcohol by volume. Scotch whisky is divided into five distinct categories: single malt Scotch whisky, single grain Scotch whisky, blended malt Scotch whisky (formerly called "vatted malt" or "pure malt"), blended grain Scotch whisky, and blended Scotch whisky. Many Scotch whisky drinkers refer to a unit for drinking as a dram.
== Awards == 1977, Young Investigator award, National Institutes of Health (NIH) 1979, Research Career Development Award, NIH 1983, Recognition Award for Young Scholars, American Association of University Women 1987, John J. Abel Award in Pharmacology, American Society for Pharmacology and Experimental Therapeutics (ASPET) Limbird was the second woman to receive this award, the first being Eva King Killam in 1954. 1989, MERIT Award, NIH 1994, Distinguished Investigator Award, National Alliance for Research on Schizophrenia and Depression (NARSAD, now Brain & Behavior Research Foundation). 1998, Distinguished Alumni Award, College of Wooster 2004, Goodman and Gilman Award in Drug Receptor Pharmacology, ASPET 2013, Julius Axelrod Award, ASPET.
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.
The powder is normally held at minus twenty degrees Celsius or below. Light and moisture exposure should be minimized. Repeated warming and cooling cycles are avoided.