The short version of GRF(1-29) fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-07-01 and is reviewed periodically as new material appears.
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.
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.
Four amino acid substitutions separate the modified backbone from the parent GRF(1-29) sequence. These changes reduce recognition by dipeptidyl peptidase IV and related proteases, extending the interval before degradation. Development work in this area sought longer-acting GHRH analogs for endocrine investigation. Published descriptions treat the substitution set as a defining property of the core sequence, while the albumin-binding linker is described separately as an optional addition to that same backbone.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Analog of growth hormone-releasing hormone |
| Chain length | 29 amino acids | Based on the GRF(1-29) fragment |
| Appearance | White to off-white lyophilized powder | Common research supply form |
| Solubility | Soluble in water and aqueous buffers | Powder requires reconstitution before use |
| Typical storage | −20 °C or below | Kept away from light and moisture |
Studies in this area generally track growth hormone pulses, insulin-like growth factor 1 concentrations, and occasionally body composition endpoints. Most published human data come from early, small trials, and questions about long-term effects remain open. Whether repeated exposure alters pituitary responsiveness over time is not settled. Analytical work relies on immunoassays for the hormones and on mass spectrometry for the peptide itself, because the two measurements answer different questions.
Binding of the peptide to the growth hormone-releasing hormone receptor on pituitary somatotrophs triggers a G protein coupled cascade that raises cyclic AMP and opens calcium channels. The result is greater secretion of growth hormone into the bloodstream. Because the peptide acts at the same receptor as the natural hypothalamic hormone, its effect is amplified pulse size rather than an entirely separate release pathway. Receptor binding alone does not determine the response, since somatostatin tone and other inputs modulate the final output.
The albumin-binding version stays in circulation for days, because covalent attachment to serum albumin shields the peptide from rapid filtration and degradation. Reported half-lives for this form fall in the range of several days. The version without the linker is cleared in minutes, with estimates often near thirty minutes in animal work. These figures come from small studies and vary with assay method, species, and route, so they are best read as approximate rather than fixed constants.
Analytical confirmation usually relies on reversed-phase high-performance liquid chromatography for purity and on liquid chromatography coupled to mass spectrometry for identity. Mass data reveal the expected molecular mass and can flag truncated or oxidized species. Amino acid analysis and peptide mapping provide sequence-level verification. Immunoassays are used in some biological matrices, but antibodies raised against one releasing-hormone analog may cross-react with another. Reported purity figures depend heavily on the method used, so comparisons between suppliers require matching the analytical approach.
The two variants differ dramatically in how long they persist in circulation. The form lacking the albumin-binding group has a plasma half-life measured in tens of minutes, comparable to the natural hormone fragment. The version carrying the drug affinity complex binds albumin and shows a half-life of roughly six to eight days in human studies. That figure comes from small trials that tracked hormone levels over extended periods. The physiological consequences of sustained versus pulsatile stimulation are still debated and the literature does not settle the point.
== Personal life == Gallrein lives in Shelbyville, Kentucky. He has been married twice. In December 1985, he married Mary E. Stuart. According to court filings, Gallrein filed to divorce his second wife, Heather Gallrein, in 2024 (one month after losing the Kentucky state legislature election). According to court filings, he told her to "get out of his house" and decided to cut her off financially. Gallrein has denied this claim.
== External links == Lipoprotein(a) at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Overview of all the structural information available in the PDB for UniProt: P08519 (Apolipoprotein(a)) at the PDBe-KB.
==== Applications of natural isotopologues ==== The relative mass spectral intensity of natural isotopologues, calculable from the fractional abundances of the constituent elements, is exploited by mass spectrometry practitioners in quantitative analysis and unknown compound identification:
== History == Flurpiridaz F-18 is a fluorine 18-labeled agent, developed by Lantheus Medical Imaging for the diagnosis of coronary artery disease. The efficacy and safety of flurpiridaz (18F) was evaluated in two prospective, multicenter, open-label clinical studies in adults with either suspected CAD (Study 1: NCT03354273) or known or suspected CAD (Study 2: NCT01347710). Study 1 evaluated the sensitivity (ability to designate an imaged patient with disease as positive) and specificity (ability to designate an imaged patient without disease as negative) of flurpiridaz (18F) for the detection of significant CAD in subjects with suspected CAD, who were scheduled for invasive coronary angiography (ICA). Across three flurpiridaz (18F) imaging readers, estimates of sensitivity ranged from 74% to 89% and estimates of specificity ranged from 53% to 70% for CAD defined as at least 50% narrowing of an artery. Study 2 evaluated the sensitivity and specificity of flurpiridaz (18F) for the detection of significant CAD in subjects with known or suspected CAD, who had ICA without intervention within 60 days prior to imaging or were scheduled for ICA. Across three flurpiridaz (18F) imaging readers, estimates of sensitivity ranged from 63% to 77% and estimates of specificity ranged from 66% to 86% for CAD defined as at least 50% narrowing of an artery.
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The short features a cover of "Pure Imagination" from Willy Wonka & the Chocolate Factory, sung by Fiona Apple. It was named one of the worst advertisements of 2013 by The Wall Street Journal. In 2011, Chipotle created the "Farm Team", which is a rewards program available only by invitation from restaurant managers. The Farm Team members have access to a special Chipotle website, where members can earn rewards, i.e. free food and T-shirts. The site offers members to, "learn where Chipotle's food comes from, take quizzes and polls, play games and watch videos about the company". In April 2014, the Farm Team program was shut down. Chipotle sponsors Team Garmin-Barracuda (formerly Team Garmin-Chipotle, Team Garmin-Slipstream, Team Garmin-Transitions and Team Garmin-Cervélo) of the International Cycling Union, and is an official team partner of the Boston Celtics, and the Boston Bruins. In June 2009, Chipotle sponsored free screenings of Food, Inc., a film that criticizes the corporate food industry. Founder Steve Ells stated that he hoped the film would make customers appreciate Chipotle's Food With Integrity policy. From May until September 2009, Chipotle ran a contest on mychipotle.com, a microsite which had a competition for the best user-created audio and video presentations about different combinations of ingredients. In July 2010, Chipotle began a campaign to support healthier lunch alternatives for students, in which money will be donated to The Lunch Box program based on how many spam Emails consumers forward to a company Email address.
The aseptic technique during insertion and handling has been shown to decrease the occurrence of these complications. Also, in some cases of infection, antibiotics could be given through the ICV system, avoiding the need for removal.
In competitive sports, doping is the use of banned athletic performance-enhancing drugs (PEDs) by athletes as a way of cheating. As stated in the World Anti-Doping Code by WADA, doping is defined as the occurrence of one or more of the anti-doping rule violations outlined in Article 2.1 through Article 2.11 of the Code. The term doping is widely used by organizations that regulate sporting competitions. The use of drugs to enhance performance is considered unethical and is prohibited by most international sports organizations, including the International Olympic Committee. Furthermore, athletes (or athletic programs) taking explicit measures to evade detection exacerbate the ethical violation with overt deception and cheating. The origins of doping in sports go back to the creation of the sport itself. From ancient usage of substances in chariot racing to more recent controversies in doping in baseball, doping in tennis, doping at the Olympic Games, and doping at the Tour de France, popular views among athletes have varied widely from country to country over the years. The general trend among authorities and sporting organizations over the past several decades has been to regulate the use of drugs in sports strictly. The reasons for the ban are mainly the health risks of performance-enhancing drugs, the equality of opportunity for athletes, and the exemplary effect of drug-free sports for the public. Anti-doping authorities state that using performance-enhancing drugs goes against the "spirit of sport".
When an organic compound is fermented, it is broken down to a simpler molecule and releases electrons. The electrons are transferred to a redox cofactor, which, in turn, transfers them to an organic compound. ATP is generated in the process, and it can be formed via substrate-level phosphorylation or by ATP synthase.
=== 1934 coup d'état === The 1934 coup d'état was executed by the Military Union and the Zveno, who removed Nikola Mushanov from power. It reflected the authoritarian trend in Europe. In this coup, Kimon Georgiev played an important role. At a meeting of the Union's Central Government, held at the house of Kimon Georgiev, it was decided to stage a coup on 19 May. Damyan Velchev and Kimon Georgiev were at the head of the coup.
Sources: en.wikipedia.org
== Significance of work == But for Eugene Garfield's 1986 tribute to De in Current Contents, De's great contributions to cholera research would have remained unknown to many even in India. A special issue of the journal Current Science was published in 1990 in his honour, to which several eminent scientists of national and international repute contributed. In the words of Dr S Sriramachari, former director of the Institute of Pathology and additional director general of the Indian Council of Medical Research, New Delhi, De's contributions stand out as a pinnacle of excellence in our understanding of the pathogenesis of cholera. Nobel laureate Prof. Joshua Lederberg had nominated De for the Nobel Prize more than once. Said Lederberg, "our appreciation of De must then extend beyond the humanitarian consequences of his discovery. . . he is also an examplar and inspiration for a boldness of challenge to the established wisdom, a style of thought that should be more aggressively taught by example as well as precept.” De was never elected a fellow of any Indian academy and never received any major award. Indeed as Professor Padmanabhan Balaram pointed out in an editorial in Current Science, "De died in 1985 unhonoured and unsung in India's scientific circles. That De received no major award in India during his lifetime and our Academies did not see it fit to elect him to their Fellowships must rank as one of the most glaring omissions of our time.
==== Foam fractionation ==== The surfactant nature of many results in their concentration at the air-water interface. In foam fractionation, air is bubbled through PFAS-contaminated water to create interfacial surfaces that collect PFAS and carry them to the surface. This process generates a foam that can be harvested or destroyed directly. The absence of a solid absorptive surface reduces consumables and waste byproducts and produces a liquid hyper-concentrate which can be fed into one of the various PFAS destruction technologies. Across various full-scale trials and field applications, this technique provides a simplistic and low operational cost alternative for complex PFAS-impacted waters. The foam fractionation technique is a derivation of traditional absorptive bubble separation techniques used by industries for decades to extract amphiphilic contaminants.
Nine people were killed in Russian missile attacks in Kharkiv. One person was killed in a separate attack in Donetsk Oblast. Russian-installed officials in Donetsk Oblast claimed that five people were killed in separate incidents of Ukrainian shelling. Ukraine launched Neptune missiles and drones at a ferry crossing and an oil depot in Port Kavkaz, Krasnodar Krai. Various sources reported three petroleum tanks were damaged and a fire broke out. Additional facilities at the Kavkaz port were damaged, including a train. A power substation connected to the Crimean Bridge was also damaged. Russian authorities claimed that two people were injured in the attack on the depot. The UAE brokered a prisoner swap in which 75 Ukrainians POWs were swapped for 75 Russian POWs. Following the US decision to allow it, German Chancellor Olaf Scholz also allowed Ukraine to use their weapons to attack targets in Russia. US sources claimed that the US government had handed over the "sensitive plans" for over 1,000 weapons systems for Ukraine to be able to build these weapons domestically. The Russian Justice Ministry designated the Put’ Domoi (Way Home) movement, a women's organisation composed of wives of Russians mobilised in Ukraine and advocating for their return on its list of "foreign agents", adding that the group was creating a "negative image" of Russia and its military and had called for illegal protests.
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=== Vaporization === Ethnobotanist Daniel Siebert cautions that inhaling hot air can be irritating and potentially damaging to the lungs. Vapor produced by a heat gun needs to be cooled by running it through a water pipe or cooling chamber before inhalation.
Sources: en.wikipedia.org
No. It is a laboratory-synthesized analog built on a fragment of the natural hormone. The natural peptide is shorter-lived and lacks the stabilizing substitutions found in the synthetic version.
DAC stands for drug affinity complex, a chemical group that binds the peptide to serum albumin. The binding slows clearance and lengthens the time the molecule stays in plasma compared with the unmodified analog.
Because two distinct molecules are discussed under one informal label. The albumin-binding version clears over several days, while the form without that group clears within roughly half an hour. Mixing results from both creates inconsistent figures.
Reported values cluster in the range of several days, reflecting slow release from the albumin complex. Estimates differ across species and assay platforms. The figure describes circulation time in study settings rather than a fixed property.