Everything below concerns proteolysis. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-05-15. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Measuring peptide exposure inside the brain is technically difficult. Selank is degraded rapidly in plasma, and assays must separate intact peptide from fragments, which favors targeted mass spectrometry over immunoassays alone. Reported half-lives are short, on the order of minutes, so effects observed hours later are attributed to downstream signaling rather than to the parent compound. Blood-brain barrier permeability is debated and rarely quantified directly. Gaps include absent dose-response characterization, inconsistent reporting of purity, and almost no pharmacokinetic data from human participants.
Selank is studied chiefly as an animal-model anxiolytic with proposed secondary effects on memory and immune signaling. Reported mechanisms include modulation of the GABA-A receptor complex, inhibition of enkephalin-degrading enzymes, and shifts in monoamine turnover within limbic structures. Some experiments describe increased expression of brain-derived neurotrophic factor in the hippocampus after repeated dosing. No single molecular target has been confirmed, and the peptide does not bind any receptor with the selectivity typical of a conventional small-molecule drug. Mechanism therefore remains a set of hypotheses rather than an established pathway.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Tuftsin analogue |
| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Single-letter form: TKPRPGP |
| Molecular formula | C33H57N11O9 | Calculated for the free peptide |
| Molecular weight | About 751.9 g/mol | Derived from the sequence |
| Appearance | White to off-white powder | Typical lyophilised form |
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.
Reported pharmacological effects center on reduced anxiety-like behavior in animal models and on measures of memory and learning. Proposed contributing mechanisms include modulation of GABAergic signaling, shifts in monoamine turnover, and changes in the activity of enzymes that degrade neuropeptides. Effects on the expression of genes linked to neuroplasticity have also been described. No single molecular target is widely accepted, and whether the behavioral findings arise from one pathway or several remains an open question.
Lyophilised material kept dry at minus 20 degrees Celsius or colder is the most stable form, and suppliers commonly state a shelf life of two years or more under those conditions. Once dissolved, degradation accelerates through hydrolysis and deamidation, particularly at alkaline pH or elevated temperature. Working solutions are usually divided into single-use aliquots to avoid repeated freeze-thaw cycles. The choice of reconstitution solvent affects both stability and the ionic strength of the final preparation.
Reverse-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres is the standard purity method. Mass spectrometry, typically electrospray ionisation, confirms identity through the expected mass-to-charge pattern. Amino acid analysis can verify composition independently. Chiral purity requires separate techniques such as derivatisation followed by chromatographic separation, and such data are rarely reported for research-grade material.
Handling follows standard practice for research peptides. Material is weighed in a low-humidity environment because the powder absorbs atmospheric moisture. Purity is reported as the percentage area of the main peak in a chromatogram, with specifications commonly set at 95 percent or higher; values below that threshold indicate the presence of truncated or modified species. Residual trifluoroacetate from purification is often present and may affect mass balance. Certificates of analysis should state the analytical method, the column and gradient used, and the lot-specific retention time so that results can be compared across suppliers.
Identity and purity of selank are established with reversed-phase high-performance liquid chromatography coupled to mass spectrometry. The peptide elutes from C18 columns with acetonitrile gradients in water containing trifluoroacetic acid or formic acid, and detection is usually performed by ultraviolet absorbance near 214 nm. Electrospray ionization in positive mode gives a doubly protonated ion near m/z 377, consistent with a mass of about 752 Da. Amino acid analysis or tandem mass spectrometry of fragment ions confirms the sequence. Because the molecule has no aromatic residues, it lacks a usable 280 nm chromophore, so low-wavelength detection or mass spectrometry is required.
Pope John Paul II provided a moral focus for anti-communism; a visit to his native Poland in 1979 stimulated a religious and nationalist resurgence centered on the Solidarity movement trade union that galvanized opposition, and may have led to his attempted assassination two years later. In December 1981, Poland's Wojciech Jaruzelski reacted to the crisis by imposing a period of martial law. Reagan imposed economic sanctions on Poland in response. Mikhail Suslov, the Kremlin's top ideologist, advised Soviet leaders not to intervene if Poland fell under the control of Solidarity, for fear it might lead to heavy economic sanctions, resulting in a catastrophe for the Soviet economy.
=== New Zealand === The New Zealand Defence Force issues an Operational Ration Pack designed to provide one soldier with three complete meals. Based around two ready-to-eat retort pouches (e.g. Lamb Casserole, Chicken Curry), the ORP comes in 4 menus. Also included are: Anzac biscuits, chocolate bars, URC fruit grains, muesli bars, instant soup powder, instant noodles, muesli cereal, a tube of condensed milk, hard crackers, tinned cheese, cocoa powder, instant coffee, tea bags, instant sport drink powder, sugar, salt, pepper, glucose sweets, Marmite, jam, ketchup, onion flakes, waterproofed matches, a resealable plastic bag, and a menu sheet.
NADH dehydrogenase [ubiquinone] 1 beta subcomplex subunit 2, mitochondrial is an enzyme that in humans is encoded by the NDUFB2 gene. NADH dehydrogenase (ubiquinone) 1 beta subcomplex, 2, 8kDa is an accessory subunit of the NADH dehydrogenase (ubiquinone) complex, located in the mitochondrial inner membrane. It is also known as Complex I and is the largest of the five complexes of the electron transport chain.
=== CaMK2D === CaMK2D appears in both neuronal and non-neuronal cell types. It is characterized particularly in many tumor cells, such as a variety of pancreatic, leukemic, breast and other tumor cells. found that CaMK2D is downregulated in human tumor cells.
=== Transit === On December 16, 2025, Pritzker signed into law the Illinois People Over Parking Act, which disburses $1.5 billion to address post-COVID-19 budget shortfalls for Chicagoland-area transit authorities to avoid service cuts; reduces the farebox revenue share of total funding from 50% to 25%, since post-pandemic reductions in ridership made these expectations unreasonable; and disburses $169 million to downstate transit agencies to cover similar budget shortfalls. It prevents transit agencies from transferring funding for operations to capital investment. Local jurisdictions are prohibited from establishing minimum parking requirements within half a mile of transit rail stations and bus hubs or one-eighth mile of corridors with combined bus route frequency of 15 minutes or less during peak periods under this legislation. The bill also reorganizes the Regional Transportation Authority into the Northern Illinois Transit Authority, which is intended to centralize decision-making power away from individual counties and synchronize operations of the Chicago Transit Authority, Metra, and Pace. The NITA board is to have 20 members, five assigned by the mayor of Chicago, the Cook County President, and the governor, and five by the five collar counties, where 15 votes are needed to affirm board actions, or 12 if two affirmative votes from each of the four appointing authorities are cast; and a majority of CTA, Metra, and Pace board members are to be simultaneously staffed by NITA board members.
Sources: en.wikipedia.org
== History == Spotlight Innovation Inc. was founded in 2012 as Spotlight Innovation, LLC. It became its current iteration in December 2013 after a merger with American Exploration Corp. (AEXP), which had been founded in 2006. At the time of the merger, the new entity, Spotlight Innovation Inc., named Cristopher Grunewald the chief executive officer. The Financial Industry Regulatory Authority approved the name change and the merger on December 16, 2013. Spotlight Innovation began trading on the OTCQB marketplace as STLT in January 2014. In May 2017, Spotlight Innovation announced that Mr. Grunewald had resigned as CEO and that John Krohn, the company's President and Chief Operating Officer, had been appointed as the interim CEO. In 2014, Spotlight Innovation founded Celtic Biotech Iowa, Inc., as a subsidiary and entered into a share exchange agreement with Celtic Biotech LTD (since rescinded), an Ireland-based pharmaceutical company developing products for the treatment of cancer and pain. According to the terms of the agreement, Celtic Biotech LTD became a subsidiary of Celtic Biotech Iowa, Inc. and was also granted access to Spotlight Innovation's commercialization and business development services. In April 2015, Celtic Biotech Iowa's first product, a formulation developed to facilitate topical delivery of drugs called EPISORB, was registered with the Food and Drug Administration and incorporated into the Pharmacy Benefit Managers database.; In Sept. 2018 the Directors of Celtic Biotech Ltd rescinded its share exchange agreement with Spotlight Innovation for just cause.
Cebaracetam (INNTooltip International Nonproprietary Name; developmental code names CGS-25248; ZY-15119) is an experimental drug of the racetam group described as a nootropic which was never marketed. It is a chlorinated acetylpiperazine-substituted analogue of phenylpiracetam and is also a derivative of RGPU-95 (4-chlorophenylpiracetam). It is the analogue of RGPU-95 in which the terminal amide group has been replaced with a piperazin-2-one moiety. The mechanism of action of cebaracetam is undefined or unknown. The drug was under development by Novartis for the treatment of cognition disorders by the 1990s but development was discontinued in 1995. It reached phase 2 clinical trials prior to its discontinuation.
=== Industrial solvents === Critics of seed oils often point to the health hazards of the solvents used in the industrial process of generating vegetable oils. Hexane, which can be neurotoxic, is extremely effective at oil extraction. Thus, it is often quoted as a danger when consuming vegetable oils as it can be found in finished oils in trace amounts. The United States Environmental Protection Agency studied the toxicity of hexane extensively in the 1980s. The studies found that the hexane used in industrial processes was safe for consumption and did not cause nerve damage.
The intussusceptum causes distension of the lower part of the rectum, which triggers the recto-anal inhibitory reflex (i.e., reflex relaxation of the internal sphincter). The internal anal sphincter is an involuntary muscle. It normally provides about 50-85% of the resting anal pressure, while the hemorrhoidal vascular cushions providing a further 15% of resting pressure. Reduced pressure in the anal canal may allow some rectal contents to passively leak out. A large mass of feces can build up in the rectum, which can harden. Liquid stool elements may pass around the obstruction and leak out in this situation. One study found that there was an inverse relationship between resting pressure of the anal canal and grade of internal prolapse. That is, the more severe the IRP, the lower the resting tone of the anal canal (which is mostly maintained by the involuntary internal anal sphincter muscle). However, there was no decrease in voluntary squeeze pressure in the higher grade internal prolapse cases. Larger IRPs are also associated with absence of the recto-anal inhibitory reflex and smaller rectal capacity.
Sources: en.wikipedia.org
=== Social control and conformity === The concept of "mental illness" is often used to label and control those with beliefs and behaviours that the majority of people disagree with. The basic premise of the anti-psychiatry movement is that psychiatrists attempt to classify "normal" people as "deviant", psychiatric treatments are ultimately more damaging than helpful to patients; psychiatry's history involves discredited treatments, such as psychosurgery, an example of this being the frontal lobectomy (commonly called a lobotomy). The use of lobotomies largely disappeared by the late 1970s. On Michel Foucault's Madness and Civilization, Sapouna (2001) writes, "[his book provides] a framework to conceptualize confinement as a process of exclusion and 'silencing of the mad'."
Drew was born in 1904 into an African-American middle-class family in Washington, D.C. His father, Richard, was a carpet layer, and his mother, Nora Burrell, trained as a teacher. Drew and three (two sisters, one brother) of his four younger siblings (three sisters and one brother) grew up in Washington's largely middle-class and interracial Foggy Bottom neighborhood. From a young age Drew began work as a paperboy in his neighborhood, daily helping deliver over a thousand newspapers to his neighbors. Drew attended Washington's Dunbar High School which was well-known for its equality and opportunities for all, despite the racial climate at the time. From 1920 until his marriage in 1939, Drew's permanent address was in Arlington County, Virginia, although he graduated from Washington's Dunbar High School in 1922 and resided elsewhere during that period of time.
This theoretical analysis of the various isomers and experimental analysis of this reaction cast doubt on whether the mass spectrometric approach really did produce the hexathione isomer as originally claimed. The increased stability of dithietes as compared to dioxetane-like rings is one of theoretical bases for proposing C6S6 is more stable than the oxygen analog.
== G == G3P – gall – gall-inducing insect – gamete – gametophyte – gastrula – gel electrophoresis – gene – genetic drift – gene duplication – gene pool – genetic code – genetic equilibrium – genetic fingerprint – genetic recombination – genetics – gene regulatory network – genetic carrier – gene therapy – genome – genome project – genomics – genotype – geologic time – George W. Beadle – glucose – glycolipid – glycolysis – glycome – glycomics – glycoprotein – glycoprotein – Gobind Khorana – Golgi apparatus – Gondwana – gradient – gravitational biology – gravitropism – Gregor Mendel – ground tissue – growth curve – Guthrie test
As can be inferred, there is a limited range of molecular weights that can be separated by each column, therefore the size of the pores for the packing should be chosen according to the range of molecular weight of analytes to be separated. For polymer separations the pore sizes should be on the order of the polymers being analyzed. If a sample has a broad molecular weight range it may be necessary to use several GPC columns with varying pores volumes in tandem to resolve the sample fully.
Sources: en.wikipedia.org
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.
Selank is a synthetic analogue built on the tuftsin tetrapeptide Thr-Lys-Pro-Arg. Extra proline residues were added to the C-terminus during design work. That modification is intended to make the peptide less vulnerable to rapid enzymatic degradation.
Transliteration from Russian produces variant spellings such as Selanc. Many suppliers avoid the trade-style name entirely and list the peptide sequence. Comparing sequences rather than names is the reliable way to confirm two entries describe the same molecule.
Intranasal administration predominates in both animal and human research because it avoids hepatic first-pass metabolism. Injectable and intraperitoneal routes appear in animal work mainly for comparison.