heptapeptide 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.
Last reviewed on 2026-04-06. Where a claim depends on a specific study, the study is described rather than over-claimed.
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
| Property | Value | Notes |
|---|---|---|
| 化学类别 | 合成七肽 | ACTH(4-10) 结构类似物 |
| 氨基酸序列 | Met-Glu-His-Phe-Pro-Gly-Pro | 单字母写作 MEHFPGP |
| 分子量 | 约 813.9 Da | 随确切形式和盐型略有变化 |
| 常见同义词 | ACTH(4-10) 类似物 | 俄语文献称 Семакс |
| 开发来源 | 俄罗斯 | 二十世纪八十年代 |
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
But as season three reminds us, the punches hit harder when there's something worth fighting for." Jake Kleinman was positive towards the season for his review at, Inverse though considered it unnecessary: "Maybe The Boys was built for Trump, and without his constant presence, it feels less necessary. Maybe Marvel is less untouchable than it was a few years ago, and The Boys no longer feels like a scrappy parody punching up but more like Amazon punching down." Inkoo Kang from The Washington Post praised the show for its themes and performances and suggested: "It's a sturdily built season, but it might make you miss the show at its full strength."
Becker muscular dystrophy has adult-onset exercise-induced muscle cramping, pain, and elevated CK. Tubular aggregate myopathy (TAM) types 1 and 2 has exercise-induced muscle pain, fatigue, stiffness, with proximal muscle weakness and calf muscle pseudohypertrophy. TAM1 has cramping at rest, while TAM2 has cramping during exercise. Stormorken syndrome includes the symptoms of TAM, but is a more severe presentation including short stature and other abnormalities. Satoyoshi syndrome has exercise-induced painful muscle cramps, muscle hypertrophy, and short stature. Dimethylglycine dehydrogenase deficiency has muscle fatigue, elevated CK, and fishy body odour. Myopathy with myalgia, increased serum creatine kinase, with or without episodic rhabdomyolysis (MMCKR) has exercise-induced muscle cramps, pain, and fatigue; with some exhibiting proximal muscle weakness.
==== Lara Macy ==== Lara Macy (Louise Lombard) was a former USMC Lieutenant working as a military police officer, and almost two decades earlier had investigated then-USMC Gunnery Sergeant Leroy Jethro Gibbs' role in the murder of Mexican drug lord Pedro Hernandez. Due to the past investigation, their relationship was volatile until the OSP's operational psychologist Nate Getz revealed to Gibbs that Macy had been protecting him for eighteen years by covering up the evidence. Since Hernandez was responsible for the slaying of Gibbs' wife and daughter, Macy felt that his actions against Hernandez were justified, a move that would end up costing Macy her own life years later. In the NCIS: Los Angeles episode "Ambush", Hetty remarks to Director Vance that the last she'd heard, as the result of a political "witch-hunt", Macy was "working out of a quonset hut in Djibouti". This was contradicted on a subsequent episode of NCIS, where Macy's personnel file states that she never worked in Djibouti but was instead reassigned to Marseille, to head up an NCIS undercover team there. It is likely that the Los Angeles branch had been fed misinformation due to the covert nature of Macy's new assignment. While in Marseille, Macy began working on a rape case involving a Petty Officer Second Class before later returning to the United States. In "Patriot Down", badly burnt remains were discovered in Annapolis with NCIS Special Agent Timothy McGee confirming that the remains were those of Macy, leaving the NCIS team and agency itself devastated.
Sources: en.wikipedia.org
=== European Union === The European Union (EU) prohibits the importation of meat products, including jerky, without additional and extensive customs documentation, and further inspections. European Union regulations on jerky, specifically biltong/jerky, focus on ensuring animal health and food safety. Imports are only allowed from countries or regions authorized for such imports, and these products must undergo specific treatments before entering the EU. Decision 2007/777/EC outlines the specific authorization requirements and treatments.
=== Risks of treatments === Both Chemotherapy and Radiotherapy are harmful to the body and most definitely the brain. Caution must be utilized in treating patients with NM. Another factor that makes treatment difficult is that there is no suitable method to evaluate the disease progression.
== Treatment == MCTD has no specific treatment. Management should address the individual's primary issues, such as arthritis, skin disease, or visceral involvement. Low-dose glucocorticoids, nonsteroidal anti-inflammatory medications, hydroxychloroquine, or a combination of these therapies can effectively treat many patients. Fever, tiredness, unspecific arthralgias, or myalgias are commonly treated with nonsteroidal anti-inflammatory medications (NSAIDs), hydroxychloroquine, or a low dose of prednisone, depending on the severity. Mild joint involvement can be effectively treated with NSAIDs, hydroxychloroquine, and oral prednisone. Methotrexate has been observed to be useful in more severe cases. If methotrexate is contraindicated, alternative disease-modifying medications for RA, such as leflunomide or azathioprine, may be used. High dosages of corticosteroids are typically effective in treating acute severe myositis. Topical steroids, prednisone, and/or hydroxychloroquine are useful in treating SLE-like skin rash, oral ulcers, and photosensitivity. Steroid treatment is often effective in treating sclerodermatous skin symptoms. Raynaud's phenomenon in MCTD typically responds to vasodilator therapy such as calcium channel blockers, as well as preventive measures including avoiding cold temperatures, smoking, and sympathomimetic drugs. Warming and protecting the fingers are also important. Recent breakthroughs have increased the therapy choices available to people with pulmonary hypertension.
Sources: en.wikipedia.org
不是。Semax 是完全人工合成的七肽，自然界中没有对应的已知肽段。它的设计灵感来自促肾上腺皮质激素片段 ACTH(4-10)，但序列经过了替换和延长。
Semax 被描述为 ACTH(4-10) 的结构类似物，两者共享部分序列特征。它保留了该片段的部分神经相关活性方向，但去除了完整片段带来的激素释放效应。二者并非同一物质，也不能互相替代。
加入的 Pro-Gly-Pro 三肽被普遍认为能提升分子对蛋白水解酶的稳定性。这种设计让短肽在体内维持时间更长。具体延长的程度以及不同组织中是否一致，文献中仍存在不同报告。
It is registered as a pharmaceutical product in Russia, where it is typically supplied as a nasal solution. In most other countries it is not an approved drug and is traded as a research chemical instead. Approval status depends entirely on the jurisdiction involved.