Tuftsin analogue 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 2025-12-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed as a stabilized analogue of tuftsin, a naturally occurring tetrapeptide fragment derived from the immunoglobulin heavy chain. The additional Pro-Gly-Pro segment at the carboxyl terminus is intended to slow enzymatic cleavage. The compound is usually described in the literature as a synthetic peptide with anxiolytic and cognitive-related activity, a label that reflects a research context rather than an approved therapeutic category.
Most published work on selank originates from a small number of research groups in the Russian Federation. A large share of that record appears in Russian-language journals, which limits access for readers who rely on English-indexed databases. Independent replication by laboratories outside the original research network is sparse in publicly available sources. This concentration of origin and language is a frequently noted feature when the compound is summarized in broader reviews of synthetic peptides.
Development work on the compound began in the 1980s and 1990s at the Institute of Molecular Genetics in Moscow, within the same research programme that produced the peptide Semax. Early investigators sought a tuftsin derivative with improved resistance to enzymatic breakdown and with activity in the central nervous system after peripheral administration. Most of the primary literature from this period was published in Russian, a factor that still shapes how easily the findings can be checked by outside groups.
Naming for this compound is not fully standardised in English sources. The spelling Selanc appears in some transliterations, and catalogue entries may instead list the peptide sequence itself as the identifier. Reference material sometimes groups it with other short synthetic peptides studied for behavioural effects, which can create confusion when citations are compared. Distinguishing the exact sequence from related tuftsin analogues is therefore a practical first step when reviewing any dataset or specification sheet.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C33H57N11O9 | Derived from the seven-residue sequence |
| Molecular weight | About 751.9 g/mol | Average mass; the monoisotopic value is slightly lower |
| Residue count | Seven amino acids | Thr-Lys-Pro-Arg-Pro-Gly-Pro |
| Parent compound | Tuftsin (Thr-Lys-Pro-Arg) | Selank extends tuftsin at the C-terminus |
| Compound class | Synthetic short peptide | Studied in a research setting; not a licensed drug in most markets |
Lyophilized selank is normally supplied as a dry powder and is considered stable for extended periods when kept cold and dry. Moisture uptake is the main practical threat, because absorbed water promotes both hydrolysis and aggregation in the solid state. Vials are usually warmed to room temperature before opening so that condensation does not form on the powder. Supplier documentation commonly specifies -20 °C for routine storage, with -80 °C used for material intended to be archived for years.
Once dissolved, the peptide is markedly less stable than the dry powder. Aqueous solutions are subject to backbone hydrolysis and to microbial growth when they are handled without sterile technique. Buffered solutions near neutral pH are common for short-term laboratory work, while acidic conditions are sometimes used to improve solubility. Analytical laboratories generally prepare working solutions fresh rather than storing them, and a residual water film left in a reopened vial can seed degradation even when the container appears dry.
Reversed-phase high-performance liquid chromatography is the standard technique for estimating peptide purity. The result is a peak-area percentage, which describes how much of the detected material elutes as the main peak in one run. Mass spectrometry confirms the molecular mass and can reveal truncated, adducted, or otherwise modified species. Amino acid analysis or tandem mass spectrometry can address sequence fidelity when identity is in doubt. None of these measurements, taken alone, establishes that a sample is fit for any specific purpose.
Animal studies have examined behaviour in tests of anxiety, memory retention and stress response, and several report changes in neurotrophic or neurotransmitter-related markers. The human evidence base is much smaller, consisting mainly of short trials conducted in Russia with limited reporting in English-language journals. Sample sizes are modest and outcome measures vary between studies, so the findings are best described as preliminary. Independent replication under modern trial standards has not been widely reported.
Outside its country of origin the compound is generally handled as a research chemical rather than an approved medicine. No regulatory approval from the United States Food and Drug Administration or the European Medicines Agency has been granted for human use. Identity and purity are normally checked by reverse-phase high-performance liquid chromatography, with mass spectrometry used to confirm the molecular mass. Lyophilised material is stored cold and desiccated, and repeated freeze-thaw cycles are avoided.
Published work on this peptide almost always uses intranasal delivery, with drops or a spray applied to the nasal mucosa. Some animal experiments have used subcutaneous or intraperitoneal injection, and a smaller number have compared routes directly. Oral administration is not a focus of the literature, because short peptides of this size are broken down by digestive enzymes and cross intestinal barriers poorly. How much of an intranasal dose reaches the bloodstream intact in humans remains an open question.
== Overview == The organisation and contents of laboratories are determined by the differing requirements of the specialists working within. A physics laboratory might contain a particle accelerator or vacuum chamber, while a metallurgy laboratory could have apparatus for casting or refining metals or for testing their strength. A chemist or biologist might use a wet laboratory, while a psychologist's laboratory might be a room with one-way mirrors and hidden cameras in which to observe behavior. In some laboratories, such as those commonly used by computer scientists, computers (sometimes supercomputers) are used for either simulations or the analysis of data. Scientists in other fields will still use other types of laboratories. Engineers use laboratories as well to design, build, and test technological devices. Scientific laboratories can be found as research room and learning spaces in schools and universities, industry, government, or military facilities, and even aboard ships and spacecraft.
== Chemistry == Dextromoramide is the right-handed isomer of the moramide molecule. The left-handed molecule is called levomoramide, and a mixture of the two is called racemoramide. Its full chemical name is (+)-1-(3-Methyl-4-morpholino-2,2-diphenylbutyryl)pyrrolidine, and its molecular formula: C25H32N2O2, with an atomic weight of ~392.5. Dextromoramide was discovered during the course of research into a related family of compounds, the α,α-Diphenyl-γ-Dialkyamino-Butyramides, which show no analgesic activity, but are extremely active physiologically as inhibitors of gastric secretions in man. Other drugs from this series show antispasmodic and antihistamine effects, but most research was put into researching analgesics. The structure-activity relationships of this family of drugs was investigated extensively, with dextromoramide representing the optimisation of several different structural features; (i) at the 1-amide group only the pyrrolidine and dimethylamide substituents were active, with pyrrolidine being more potent (ii) the alkyl chain was more potent when methylated, 3-methylation was more potent than 4-methylation, and in the 3-methyl analogues the dextro isomer was more active (iii) while morpholine, dimethylamine, pyrrolidine and piperidine were all active at the 4-amine group, morpholine was the most active (iv) any substitution on the phenyl rings reduces activity.
In February 2026, SF Airlines signed a 2026 cooperation memorandum with China Cargo Airlines, a subsidiary of EAL; the two parties plan to collaborate on capacity swaps on key routes such as Shanghai Pudong—Los Angeles and Shenzhen—Los Angeles, and jointly develop interline products from Southeast Asia to Europe and the US. In the same month, SF launched an income boost plan for its frontline employees nationwide, investing 200 million RMB to help all couriers increase their income, with an average raise of around 500 RMB per person. In addition, as the end of February, SF Holding had spent nearly 2 billion RMB on share buybacks, repurchasing 50.96 million A-shares, which accounts for 1.01% of its total shares.
Through "neural lace", a form of brain–computer interface that is implanted into the brains of young people and grows with them, the Culture has the capability to read and store the full sentience of any being, biological or artificial, and thus reactivate a stored being after its death. The neural lace also allows wireless communication with the Minds and databases. This also necessitates the capability to read thoughts, but as described in Look to Windward, doing this without permission is considered taboo.
Sources: en.wikipedia.org
=== Humanity === Humans uniquely share spiritual attributes with God and the angels above them, love and language, and physical attributes with the animals below them, like having material bodies that experienced emotions and sensations such as lust and pain, as well as physical needs such as hunger and thirst.
== Methods == There is a range of IQF technologies, but the main concept is to transport the product into the freezer with the help of a processing line belt or infeed shaker. Inside the freezer, the product travels through the freezing zone and exits the other side. Product transport inside the freezer uses different technologies. Some freezers use transport belts similar to a conveyor belt. Others use bed plates that hold the product, and an asymmetrical movement makes the plate advance by itself through the freezer. There are two main IQF technologies: mechanical IQF freezers and cryogenic IQF freezers. Mechanical IQF freezers work on the principle of cold air circulation, which flows from underneath the bed plate or transport belt with the help of fans. The cold airflow passes through the pieces of product in circular motions while the product is also advancing through the freezer towards the exit. The design and efficiency of this type of IQF freezers varies among manufacturers who seek to find the perfect balance of aerodynamics for an optimal freezing result. This technology has seen impressive improvements and developments during the past 20 years, being suited for an increasing range of products. Cryogenic IQF freezers immerse the product in liquid nitrogen at very low temperatures, freezing it rapidly while continuously moving the product to avoid block or lump formation. Although this method shows good freezing results, it might lead to higher processing costs per weight of product due to the cost of the liquid nitrogen required.
NatB is an enzyme in an enzyme group called N-terminal acetyltransferases (NATs), which modify proteins by doing N-terminal acetylation. NatB is one of the major NATs in the cell and is a heterodimeric complex found in the cytosol consisting of the auxiliary subunit NAA25, and the catalytic subunit NAA20. Subunit NAA25 anchors to the ribosome, and subunit NAA20 is the enzymatic subunit. The NatB complex adds an acetyl group directly on a substrate protein as it is being made on the ribosome, also known as co-translational modification. Studying the NatB complex binding to the ribosome in yeast has shown that NatB is localized at the exit tunnel of the ribosome, and binding of the NatB subunits on the ribosome depends on ES27a (small ribosomal subunit protein). NatB is structurally and biologically the same between yeast (Saccharomyces cerevisiae) and humans. The structure of the NatB complex in yeast (Candida albicans) was studied in 2017., and NAA25 seems to create a pocket for NAA20, where target protein is bound to. The NAA20 structure in the thermophilic fungus Chaetomium thermophilum was successfully characterized in 2020, and NAA20 was found to be able to acetylate target proteins in the absence of NAA25, though with a lower acetylation rate than the NAA20/NAA25 complex of NatB. However, NAA20 in humans is unstable in the absence of NAA25 and therefore NatB forms a complex in vivo NatB is responsible for N-terminally acetylating approximately 20% of the human proteome.
Sources: en.wikipedia.org
An article in the August 13, 2007 issue of The New Yorker magazine, written by Richard Preston, discusses "deep-brain stimulation" as a possible treatment. It has been performed on a few patients with Lesch–Nyhan syndrome by Dr. Takaomi Taira in Tokyo and by a group in France led by Dr. Philippe Coubes. Some patients experienced a decrease in spastic self-injurious symptoms. The technique was developed for treating people with Parkinson's disease, according to Preston, over 20 years ago. The treatment involves invasive surgery to place wires that carry a continuous electric current into a specific region of the brain. An encouraging advance in the treatment of the neurobehavioural aspects of LNS was the publication in the October, 2006 issue of Journal of Inherited Metabolic Disease of an experimental therapy giving oral S-adenosyl-methionine (SAMe). This drug is a nucleotide precursor that provides a readily absorbed purine, which is known to be transported across the blood–brain barrier. Administration of SAMe to adult LNS patients was shown to provide improvement in neurobehavioural and other neurological attributes. The drug is available without prescription and has been widely used for depression, but its use for treating LNS should be undertaken only under strict medical supervision, as side effects are known.
==== Notes ==== Contains points of note, including explanation of titles and details of a legion's fate. Province names and borders are assumed throughout the Principate period as at 107, during the rule of Trajan, and after the annexation of Dacia and Arabia Petraea. The map above shows provinces at the end of Trajan's reign, 117. They are the same as in 107, except that Armenia and Mesopotamia have been annexed (they were abandoned soon after Trajan's death); and Pannonia has been split into two (the split occurred c. 107). In reality provincial borders were modified several times between 30 BC and 284: this explains any discrepancy with other sources, as to a legion's location at a particular date.
=== Other === In April 2017 MGX Minerals reported it had received independent confirmation of its rapid lithium extraction process to recover lithium and other valuable minerals from oil and gas wastewater brine.
Raleigh-Durham International Airport (IATA: RDU, ICAO: KRDU, FAA LID: RDU), the region's primary airport and the second largest in North Carolina, located northwest of downtown Raleigh via Interstate-40 between Raleigh and Durham, serves the city and greater Research Triangle metropolitan region, as well as much of eastern North Carolina. The airport offers service to nearly 75 domestic and international destinations and serves approximately 15 million passengers a year. RDU is served by 16 air carriers, flying to a multitude of nonstop destinations on 350+ flights daily. The airport also offers facilities for cargo and general aviation. The airport authority tripled the size of its Terminal 2 (formerly Terminal C) in January 2011. Private general aviation airports in Raleigh include Triple W Airport (ICAO: K5W5, FAA LID: 5W5).
Sources: en.wikipedia.org
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, designed as a metabolically stabilized analogue of the endogenous tetrapeptide tuftsin. It has been studied mainly against anxiety-related and cognitive endpoints rather than as an approved medicine in most jurisdictions.
Tuftsin contains four residues, while selank carries an additional Pro-Gly-Pro segment at the carboxyl end. That extension is intended to reduce enzymatic cleavage. Comparative pharmacokinetic data in humans remain limited.
No single receptor target is widely accepted as the definitive mediator of the reported effects. Proposed contributors include GABAergic modulation, shifts in monoamine turnover, and altered neuropeptide degradation. The mechanism is treated in the literature as unresolved.
The sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, commonly written as TKPRPGP. It shares the first four residues with tuftsin and carries three prolines in the chain. The proline-rich tail is the main structural feature that separates it from the parent tetrapeptide.