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Identity And Molecular Context — Beginner to Advanced

By Editorial Desk · published 2026-06-09 · last reviewed 2026-07-10 · Info

The short version of hGH fragment fits in a sentence. The long version — which is the one that helps — is below.

This page was last updated on 2026-07-10 and is reviewed periodically as new material appears.

Identity and Molecular Context

AOD-9604 is a synthetic peptide modeled on the C-terminal region of human growth hormone. It corresponds to residues 176-191 of the 191-amino-acid hGH sequence. The fragment is not the full hormone and lacks the receptor-binding region associated with growth and metabolic effects of hGH. Researchers developed it to isolate a specific portion of hGH for study. Its exact sequence and length are often stated in peptide catalogs and patents.

The peptide is frequently described as a growth hormone fragment, although it is chemically distinct from full-length hGH. AOD-9604 contains 16 amino acids and includes two cysteine residues that can form an intramolecular disulfide bond. In solution, this structural feature can influence folding, aggregation, and stability. Published descriptions sometimes call it hGH 176-191 or AOD9604, with spacing and capitalization varying. Such naming differences can complicate literature searches, database entries, and product verification.

Researchers have studied the fragment in cell and animal models to understand its metabolic actions. Some experiments report effects on fat breakdown and fat storage pathways, but the underlying mechanism remains incompletely defined. AOD-9604 does not appear to stimulate the same broad growth hormone receptor signaling as full-length hGH. Whether its observed activities arise from direct receptor interactions or downstream metabolic changes is an open question. Results from different assays are not always consistent.

Identity and Research Origin

AOD-9604 is a synthetic peptide whose sequence matches the C-terminal fragment of human growth hormone, specifically residues 176 through 191. This region differs from the full hormone in its receptor interactions. The peptide is not a growth hormone secretagogue and does not bind the growth hormone receptor in the same manner. Researchers have examined it for effects on lipid metabolism, but its exact pharmacological profile remains an active area of study.

Development of AOD-9604 began in the 1990s as scientists sought to isolate metabolic effects of growth hormone without its growth-promoting actions. Early laboratory work focused on fat cells and animal models. Several human trials followed, examining changes in body composition and fat mass. Results have been mixed, and the peptide has not progressed to widespread clinical approval. Interest continues in research settings, particularly regarding its mechanism and potential metabolic targets.

Aod-9604 at a glance

PropertyValueNotes
Molecular classSynthetic peptideDerived from a fragment of human growth hormone
Sequence basishGH residues 176-191Commonly described as a 16-amino-acid fragment
AppearanceWhite to off-white powderTypical for lyophilized research peptides
SolubilitySoluble in water or aqueous bufferExact solubility depends on pH and purity
Common synonymsAOD9604; hGH 176-191Spelling and punctuation vary across sources

Identity and Research Context

Several names appear in scientific and commercial settings. AOD9604 and AOD-9604 are development codes used interchangeably, while hGH fragment 176-191 describes the same region. The peptide includes a disulfide bond between two cysteine residues, which helps shape its three-dimensional structure. Different suppliers may provide acetate or other salt forms, and purity can vary. These differences matter because analytical tests and biological assays can respond to the specific form being studied.

Early interest in AOD-9604 centered on whether a fragment of human growth hormone could influence fat metabolism without the broader effects of the full hormone. Cell and animal studies reported changes in fat storage and breakdown. Human trials followed, but the results were not strong enough to secure regulatory approval. The compound remains available for laboratory research, and its clinical potential is still described as uncertain. Studies continue to examine its activity and safety profile.

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Background And Research Context

AOD-9604 is a synthetic peptide modeled on the C-terminal region of human growth hormone. It is often described as hGH fragment 176-191. Research interest arose because it was designed to isolate possible effects on fat metabolism from other actions of growth hormone. It is not a full growth hormone molecule. Its development history includes early laboratory and animal studies followed by human trials. The peptide has been examined in laboratory, animal, and limited human studies.

The compound has been studied as a potential treatment for obesity and related metabolic conditions. Published trials have examined changes in body weight, fat mass, and safety markers over limited durations. Results have been mixed or modest, and no large-scale outcome trials are established. Regulatory agencies in several countries have not approved it as a therapeutic drug. Some commercial products have been marketed outside regulated pharmaceutical channels, which raises questions about quality and claims.

In the scientific literature, AOD-9604 appears in reviews of growth hormone fragments and in discussions of peptide-based metabolic research. Some sources distinguish it from growth hormone itself, while others group it with compounds marketed for weight management. The evidence base is small compared with approved obesity medications. Questions about long-term efficacy and clinical relevance remain open, and independent replication of key findings is limited. Most published reports are early-stage and exploratory.

Regulatory and Analytical Context

Detection and characterization of AOD-9604 in research and anti-doping settings typically rely on mass spectrometry coupled with liquid chromatography. These methods can identify the peptide by its mass and fragmentation pattern. Immunoassays may also be used in some screening contexts, but they can cross-react with related peptides. Because the molecule is small and may be present at low concentrations, sample preparation and method validation are important. Confirmatory analysis usually requires comparison with a certified reference standard.

In laboratory settings, AOD-9604 is commonly supplied as a lyophilized powder and stored cold to limit degradation. Reconstituted solutions are typically kept refrigerated or frozen, depending on the buffer and concentration, and protected from repeated freeze-thaw cycles. Stability can be influenced by pH, temperature, and the presence of proteases. Purity is usually assessed by high-performance liquid chromatography and mass spectrometry. These practices support reproducibility, but they do not imply safety or efficacy for any human use.

Regulatory status: AOD-9604 is not approved as a therapeutic drug in the United States, European Union, or other major markets. It is listed by the World Anti-Doping Agency as a prohibited substance in sport, specifically under growth hormone fragments. Many jurisdictions restrict its sale for human consumption. Products marketed online may not meet pharmaceutical quality standards. The legal status varies by country and often depends on whether the material is presented as a research chemical, supplement, or drug.

Further detail

The majority of the population of Jammu and Kashmir is Muslim and a large minority is Hindu. Most Muslims in Jammu and Kashmir belong to the Sunni sect of Islam, especially the Gurjars, Bakarwals, Sayids, Pathans, Sheikhs, Mughals, Paharis, and Doms. As per the 2011 census of India, about 68.3% of people in Jammu and Kashmir were Muslims. Hindu made up around 28.4% of the population. Other small religious groups included Sikhs at 1.9%, Buddhists at 0.9%, and Christians at 0.3%. The population of the Kashmir Division is predominantly Muslim (96.41%) with small Hindu (2.45%) and Sikh (0.81%) communities. Shias are mostly concentrated in the Budgam district, where they form about 30–40% of the population. Among the Kashmiri Hindus, the Pandits are a significant group. The Jammu Division is predominantly Hindu (67.5%) with a significant Muslim population (30%). The Muslims form a majority in the Rajouri (63%), Poonch (90%), Doda (54%), Kishtwar (58%) and Ramban (71%) districts of Jammu, while the Hindus form a majority in Kathua (88%), Samba (86%), Jammu (84%) and Udhampur (88%) districts. Reasi district has an almost equal number of Hindus and Muslims. Most Dogras in the region are Hindus and belong to various Hindu castes. Paharis include both Hindu and Muslims. The Gurjars and Bakarwals are predominantly Sunni Muslims.

InterRidge Vents Database – global database of the locations of known active submarine hydrothermal vent fields, hosted by InterRidge Ocean Explorer – public outreach site for explorations sponsored by the US Office of Ocean Exploration Video by EV Nautilus Video by Schmidt Ocean

In addition to the Hurricanes, the North Carolina FC of the United Soccer League Championship and North Carolina Courage of the National Women’s Soccer League play in suburban Cary to the west; the Carolina Mudcats, a Single-A minor-league baseball team, play in the city's eastern suburbs; the newly formed Single-A minor-league baseball Fayetteville Woodpeckers, who formerly played in Buies Creek, began play in the nearby out-of-county southern suburb of Fayetteville when their new ballpark opened in 2019; the Carolina Flyers of the American Ultimate Disc League play primarily at Cardinal Gibbons High School near the Lenovo Center; and the Durham Bulls, the AAA minor-league baseball team made internationally famous by the movie Bull Durham, play in the neighboring city of Durham. The Raleigh Firebirds of The Basketball League play at St. Augustine's University. Several other professional sports leagues have had former franchises (now defunct) in Raleigh, including the Raleigh IceCaps of the ECHL (1991–1998); Carolina Cobras of the Arena Football League (2000–2004); the Raleigh–Durham Skyhawks of the World League of American Football (1991); the Raleigh Bullfrogs of the Global Basketball Association (1991–1992); the Raleigh Cougars of the United States Basketball League (1997–1999); and most recently, the Carolina Courage of the Women's United Soccer Association (2000–2001 in Chapel Hill, 2001–2003 in suburban Cary), which won that league's championship Founders Cup in 2002.

Sources: en.wikipedia.org

Supporting material

==== RNC-seq ==== The full length translating mRNA (RNC-seq) involves centrifugation of lysated sample on a sucrose cushion. This allows separation of the Ribosome-nascent chain complex(RNC) from free mRNA and other cell components. The RNCs form a pellet in the centrifugation that is collected for further analysis. The mRNA being translated in these RNCs can be sequenced, allowing identification and quantification of the mRNAs being translated at the time. However, RNC-mRNA complexes are fragile, which can lead to ribosomes to dissociate from the mRNAs and degradation of the mRNAs, potentially biasing the collected results.

During the dot-com boom, Webvan, an online-only supermarket, was formed and went bankrupt after three years and was acquired by Amazon. The British online supermarket Ocado, which uses a high degree of automation in its warehouses, was the first successful online-only supermarket. Ocado expanded into providing services to other supermarket firms such as Waitrose and Morrisons. Grocery stores such as Walmart employ food delivery services offered by third parties such as DoorDash. Other online food delivery services, such as Deliveroo in the United Kingdom, have begun to pay specific attention to supermarket delivery. Delivery robots are offered by various companies partnering with supermarkets. Micro-fulfillment centers (MFC) are relatively small warehouses with sophisticated automated rack-and-tote systems which prepare orders for pickup and delivery. Once the order is complete, the customer will pick it up (i.e. "click-and-collect") or have it fulfilled via home delivery. Supermarkets are investing in micro-fulfillment centers with the hope that automation can help reduce the costs of online commerce and e-commerce by shortening the distances from store to home and speeding up deliveries. MFCs are said by many to be the key to profitably fulfilling online orders.

=== June === June 24, 2011: Canada, China, European Union, United States As house prices remain low in the US housing market, significant foreign purchases have been made by the Canadians, Chinese and Europeans (mainly French, Spanish and Italian), seeing total spending around US$16 billion. Housing prices fell 3% in the first quarter of the year, seeing housing sales increase 5.1% in March.

=== Heart === Cardiovascular diseases are the leading cause of death worldwide, and have increased proportionally from 25.8% of global deaths in 1990, to 31.5% of deaths in 2013. This is true in all areas of the world except Africa. In addition, during a typical myocardial infarction or heart attack, an estimated one billion cardiac cells are lost. The scarring that results is then responsible for greatly increasing the risk of life-threatening abnormal heart rhythms or arrhythmias. Therefore, the ability to naturally regenerate the heart would have an enormous impact on modern healthcare. However, while several animals can regenerate heart damage (e.g. the axolotl), mammalian cardiomyocytes (heart muscle cells) cannot proliferate (multiply) and heart damage causes scarring and fibrosis. Despite the earlier belief that human cardiomyocytes are not generated later in life, a recent study has found that this is not the case. This study took advantage of the nuclear bomb testing and other radioactive sources during the Atomic Age which introduced carbon-14 into the atmosphere (essentially all of which had decayed up to that point in Earth's history) and therefore into the cells of biologically active inhabitants. They extracted DNA from the myocardium of these research subjects and found that cardiomyocytes do in fact renew at a slowing rate of 1% per year from the age of 25, to 0.45% per year at the age of 75 by comparing the presence of carbon-14 with the stable and abundant carbon-12.

Sources: en.wikipedia.org

Supporting material

== Career == Upon receiving his Ph.D., Gattuso moved to Australia where he was a postdoctoral researcher at the Australian Institute of Marine Science(1988-1990). In 1990, Gattuso took a position of CNRS research scientist at Centre de Biologie et Écologie Tropicale et Méditerranéenne of the University of Perpignan (1990-1992). He then moved to the Scientific Center of Monaco to launch and lead the Ecophysiology and Biogeochemistry group. In 1998, Gattuso went back to a CNRS joint laboratory at the Villefranche Oceanographic Observatory and moved to the ranks of Research Professor (directeur de recherche). He is also Associate Scientist at the Institute for Sustainable Development and International Relations (IDDRI-SciencesPo, Paris). Gattuso has been visiting professor or scientist at Rutgers University, the National Center for Atmospheric Research and Shantou University. Gattuso is the founding editor-in-chief of Biogeosciences and served or has served in the editorial board of several scientific journals. He founded the Biogeosciences Division of the European Geosciences Union, and has received multiple awards and honors for his research contributions. He led the launch of the Ocean Acidification International Coordination Centre at the International Atomic Energy Agency, co-edited the first book on ocean acidification (Oxford University Press) and contributed to several IPCC products (5th Assessment Report, Special Report on 1.5°C of Warming, and the Special Report on the Ocean and Cryosphere in a Changing Climate).

=== Prehistoric reptiles === Pterosaurian pycnofibrils strongly resemble mammalian hair, but are thought to have evolved independently. Ornithischian (bird-hipped) dinosaurs had a pelvis shape similar to that of birds, or avian dinosaurs, which evolved from saurischian (lizard-hipped) dinosaurs. The Heterodontosauridae evolved a tibiotarsus which is also found in modern birds. These groups are not closely related. Ankylosaurs and glyptodont mammals both had spiked tails. The sauropods and giraffes independently evolved long necks. The horned snouts of ceratopsian dinosaurs like Triceratops have also evolved several times in Cenozoic mammals: rhinos, brontotheres, Arsinoitherium, and Uintatherium. Rhynchosaur teeth resemble that of the extant rodents. Billed snouts on the duck-billed dinosaurs hadrosaurs are strikingly convergent with ducks and the duck-billed platypus. Ichthyosaurs (such as Ophthalmosaurus) are marine reptile of the Mesozoic era which looked strikingly like dolphins. Several groups of marine reptiles evolved hyperphalangy similar to modern whales. Toothless beaks are independently derived in ornithomimosaurian, alvarezsaurian, therizinosaurian, oviraptorosaurian and ceratopsian dinosaurs like Triceratops, certain pterosaurs, birds, turtles, and cephalopods like squid, cuttlefish, and octopus. The "Pelycosauria" and the Ctenosauriscidae bore striking resemblance to each other because they both had a sail-like fin on their back.

To reinforce his intentions for the Smithsonian, Henry established laboratories, developed a robust physical sciences library, and started the Smithsonian Contributions to Knowledge, the first of many publications intended to disseminate research results. For Henry, the Library of Congress was the obvious choice as the national library. Unable to resolve the conflict, Henry dismissed Jewett in July 1854. In 1865, the Smithsonian building, also called the Castle due to its Norman architectural style, was severely damaged by fire. This incident presented Henry with an opportunity related to the Smithsonian's non-scientific library. Around this time, the Library of Congress was planning to build and relocate to the new Thomas Jefferson Building, designed to be fireproof. Authorized by an act of Congress, Henry transferred the Smithsonian's non-scientific library of 40,000 volumes to the Library of Congress in 1866. In 1861, President Abraham Lincoln appointed John G. Stephenson as Librarian of Congress; the appointment is regarded as the most political to date. Stephenson was a physician and spent equal time serving as librarian and as a physician in the Union Army. He could manage this division of interest because he hired Ainsworth Rand Spofford as his assistant. Despite his new job, Stephenson focused on the war. Three weeks into his term as Librarian of Congress, he left Washington, D.C., to serve as a volunteer aide-de-camp at the battles of Chancellorsville and Gettysburg during the American Civil War.

Sources: en.wikipedia.org

Frequently asked questions

Is AOD-9604 the same as human growth hormone?

No, it is a synthetic peptide fragment corresponding to a small portion of hGH. It is not the full 191-amino-acid hormone and does not reproduce all of hGH's effects.

What is the exact length of AOD-9604?

It is commonly described as a 16-amino-acid peptide based on residues 176-191 of human growth hormone. Some sources vary in notation, so checking the stated sequence is useful.

Does AOD-9604 occur naturally?

It is not typically described as a standalone natural hormone. The sequence is derived from the C-terminal region of human growth hormone, but the synthetic peptide is a laboratory-made construct.

What is AOD-9604?

AOD-9604 is a synthetic peptide fragment of human growth hormone, corresponding to amino acids 176-191. It is studied for potential effects on fat metabolism, but it is not approved as a drug in most countries. Its exact mechanism remains under investigation.

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