A practical reference on Selank: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-01-16. Anything still debated is marked as such rather than presented as settled.
Laboratory work relies on standard behavioral paradigms. Rodents are tested in the elevated plus maze, open field, and passive avoidance tasks, with outcomes compared against diazepam or vehicle controls. Intranasal dosing is used most often because it bypasses first-pass metabolism, though intraperitoneal and intravenous routes also appear in published protocols. Biochemical endpoints include tissue BDNF concentrations, cytokine levels, and monoamine metabolites. Human data are limited to small Russian trials reporting reduced anxiety scores; most were not prospectively registered, and few employed independent outcome assessment.
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.
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.
Peptide bonds in selank are susceptible to hydrolysis under strongly acidic or basic conditions, and the terminal proline residues are vulnerable to exopeptidase activity in biological samples. Lyophilized powder stored dry at -20 °C typically remains stable for extended periods, whereas aqueous solutions degrade faster and may lose measurable purity within days to weeks depending on pH, temperature, and microbial load. Repeated freeze-thaw cycles promote aggregation and adsorption to container surfaces. For analytical work, solutions are usually prepared fresh, kept cold, and used within a single working day.
| Property | Value | Notes |
|---|---|---|
| Principal proposed target | GABA-A receptor complex | Hypothesis derived mainly from animal pharmacology |
| Common behavioral assay | Elevated plus maze | Rodent test for anxiety-like behavior |
| Reported molecular marker | Hippocampal BDNF expression | Measured by immunoassay or mRNA quantification |
| Typical dosing route | Intranasal | Chosen to reduce first-pass metabolism |
| Reported plasma half-life | Minutes | Based on limited peptide stability data |
Characterization of Selank in a laboratory setting relies on standard peptide methods. Reverse-phase high-performance liquid chromatography separates the target from related impurities and provides a purity figure, commonly reported as 95 percent or higher. Mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, confirms the molecular mass and helps detect truncation or modification. Amino acid analysis can verify composition when a sequence-level check is needed. These techniques together establish identity and purity for a given lot.
Lyophilized Selank, the dry powder form, is generally stored frozen at minus 20 degrees Celsius or colder for long-term keeping. The solid is hygroscopic and should stay sealed, dry, and protected from light. Once dissolved, the peptide is less stable and is usually held refrigerated at 2 to 8 degrees Celsius for short periods. Repeated freezing and thawing is avoided because it can promote aggregation and loss of activity. Buffers and pH choice also affect how long a solution remains usable.
Solubility behavior is a practical concern for handling. Selank dissolves readily in water and in common aqueous buffers, which simplifies preparation of working solutions. The choice of solvent, ionic strength, and pH can influence aggregation over time, particularly at higher concentrations. Aqueous solutions are typically sterile-filtered before use. Because stability depends on several variables, storage and handling notes should be treated as general guidance rather than fixed rules, and specific values are best confirmed against a certificate of analysis for each batch.
Development took place at the Institute of Molecular Genetics of the Russian Academy of Sciences, where a series of short peptides were designed in the 1980s and 1990s. Selank was selected from variants of tuftsin that showed resistance to plasma peptidases. Russian regulatory approval covers it as an anxiolytic agent given intranasally. Outside that market the compound is normally handled as a research chemical rather than a medicine, and no widely recognised international pharmacopoeial monograph exists. The name Selank is a coined trade designation rather than a systematic chemical name.
Enzymatic stability motivates the extra three residues at the carboxyl end. Native tuftsin is cleaved quickly by circulating aminopeptidases and carboxypeptidases, which limits its duration of action and its usefulness as a tool compound. Extending the chain with proline-rich segments is a common design tactic because proline constrains the backbone and slows proteolysis. The same Pro-Gly-Pro motif appears in other Russian-developed peptides of the era. Whether the full seven-residue chain is required for activity, or whether it acts mainly as a prodrug releasing tuftsin, remains unresolved.
Selank is a synthetic heptapeptide developed in Russia during the 1990s. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences designed it as a stabilized analog of tuftsin, a naturally occurring immunomodulatory tetrapeptide. The compound has been studied primarily for its reported anxiolytic and nootropic effects. It remains largely unknown in Western pharmacology and is not approved as a medicine by major regulators such as the FDA or the EMA.
The primary structure of Selank is Thr-Lys-Pro-Arg-Pro-Gly-Pro, corresponding to the molecular formula C33H57N11O9 and a monoisotopic mass of roughly 751.9 daltons. The N-terminal threonine and the arginine residue in the fourth position are shared with tuftsin, which carries the sequence Thr-Lys-Pro-Arg. The three additional residues at the C-terminus, Pro-Gly-Pro, extend the chain and are associated with greater resistance to enzymatic degradation. This extension also separates Selank from the shorter parent peptide.
Naming conventions place Selank in the same research family as Semax, another Russian-developed peptide investigated for cognitive effects. The two compounds share a lineage but differ in sequence and in the biological systems proposed as their targets. Semax descends from ACTH fragments, whereas Selank descends from tuftsin. Publications sometimes identify Selank by its full peptide sequence or by laboratory codes rather than one uniform trade name. Because replication outside Russia is limited, reports on its properties are best read alongside the study design and the purity of the material tested.
=== Nightcrawler === Kurt Wagner ist Nightcrawler, aufgrund seiner Mutantenkraft ein Teleporter, der sich in Sekundenbruchteilen durch eine Zwischendimension von einem Ort zum nächsten bewegen kann. Seine blaue Haut, seine spitzen Zähne, sein Schwanz und seine zweizehigen Füße und dreifingrigen Hände verleihen ihm ein dämonenähnliches Aussehen. Aufgewachsen ist er in Bayern als Teil einer Zirkusfamilie unter Margali Szardos, einer mächtigen Zauberin, und ihrer Tochter Jimaine, die für lange Zeit unter dem Namen Amanda Sefton Kurts Freundin war. Er ist viele Jahre als Akrobat im Zirkus aufgetreten, wo er auch den Namen Nightcrawler erhielt. Er ist der leibliche Sohn von Mystique und eines ihm ähnlich sehenden Dämonen namens Azazel, der tatsächlich aus der Hölle stammt; ferner existieren noch mehrere Halbbrüder von ihm (Abyss, Kiwi Black und die Bamfs, die aussehen wie Kleinkindausgaben von ihm). Seine kompletten Familienverhältnisse waren für Kurt selber lange Zeit unbekannt. Zudem ist er in Storm verliebt, weshalb er recht neidisch auf Black Panther ist, als die beiden heiraten, und nach der Trennung versucht, Storm wieder aufzubauen. Am Ende der Uncanny X-Men-Reihe rettet er die X-Men, wird dabei allerdings so schwer verletzt, dass er kurz darauf in Storms Armen stirbt. Zu Beginn der Amazing X-Men-Reihe wird er von den X-Men (die mittels eines Portals, das die Bamfs gebaut haben, dorthin gelangen konnten) aus der Hölle gerettet, wohin er seinem Vater Azazel vom Paradies aus gefolgt ist, um ihn von der Eroberung des Himmels abzuhalten.
Dabei rettet er Storm (inzwischen von Black Panther geschieden), die von Piraten entführt und fast getötet wird, und gesteht ihr, dass er sich schon vor Jahren in sie verliebt hat. Nach seiner Rückkehr zu den X-Men stellt er zudem Mystique zur Rede, warum sie sich nicht um ihn gekümmert hat, woraufhin sie ihm erklärt, dass er als Baby entführt wurde. Daraufhin verzeiht er ihr. Er war ein Mitglied des „zweiten“, der New X-Men, und später von Excalibur, einer in England beheimateten Superheldengruppe. In einer anderen Zeitlinie hat er mit Scarlet Witch eine Tochter, die sein Aussehen geerbt hat; T.J. Wagner alias Nocturne. Er erschien das erste Mal in Giant-Size X-Men # 1 (Mai 1975). Andere Medien:
Die Band Weezer zollte der Figur in dem Song In The Garage Tribut, in dem das lyrische Ich neben einem Poster von Ace Frehley und Kitty Pryde (Shadowcat) auch ein Poster des Nightcrawlers an der Wand hängen hat. Die Textzeilen lauten: „I’ve got Kitty Pryde / and Nightcrawler too / Waiting there for me …“. Nightcrawler wird in den Filmen X-Men 2 und Avengers: Doomsday von Alan Cumming verkörpert. Zudem erscheint sein von Jason Flemyng gespielter Vater Azazel im Film X-Men: Erste Entscheidung. Kodi Smit-McPhee übernahm die Rolle in X-Men: Apocalypse, Deadpool 2 und in X-Men: Dark Phoenix.
Sources: de.wikipedia.org
=== Northstar === Northstar, bürgerlich Jean-Paul Beaubier, ist ein kanadischer Mutant mit der Fähigkeit zu fliegen und sich übermenschlich schnell zu bewegen. Er ist der Zwillingsbruder von Aurora und Mitglied des Teams Alpha Flight. Nach dem Tod seiner Eltern wuchs er bei Pflegeeltern auf und als auch diese starben, kam er in ein Waisenhaus. Er wurde ein begnadeter Skifahrer und gewann mehrere Meisterschaften. Seine Schwester lernte er erst bei Alpha Flight kennen, wo dessen Mitglied James Hudson alias Guardian die beiden zusammenbrachte. Er war außerdem zeitweise Mitglied der X-Men. Northstar ist homosexuell und heiratete 2012 den Sport-Eventmanager Kyle, was die erste gleichgeschlechtliche Ehe in einem Superhelden-Comic darstellte. Seinen ersten Auftritt hatte er in Uncanny X-Men #120 (1979).
Sources: de.wikipedia.org
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.
Behavioral endpoints include time spent in open arms of the elevated plus maze and avoidance latencies. Biochemical endpoints include BDNF concentration, cytokine levels, and monoamine metabolite ratios in brain tissue.
Most published studies are small, originate from a limited number of laboratories, and lack independent replication. Dose-response relationships, measured brain exposure, and long-term outcomes are not well characterized.
Identity is confirmed by matching the retention time in reversed-phase chromatography against a reference standard and by measuring the molecular mass with mass spectrometry. Tandem mass spectrometry or amino acid analysis can verify the sequence of the seven residues. Because the peptide contains no aromatic amino acids, detection at 280 nm is not useful.