A practical reference on Selank: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-02-16 and is reviewed periodically as new material appears.
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.
Quantification in biological matrices relies on liquid chromatography coupled to tandem mass spectrometry with stable-isotope internal standards. Low plasma concentrations and adsorption to container surfaces both complicate measurement. Solid-phase extraction is often needed to reduce matrix interference before injection. Reported limits of quantification differ widely between laboratories, which makes direct comparison of pharmacokinetic results difficult and limits meta-analysis.
Peptide bonds are vulnerable to protease attack, and Selank is no exception. Measured half-life in serum is short, on the order of minutes in several reports, which explains why intranasal administration is the common route described in the literature. Absorption across the nasal mucosa partially bypasses first-pass hepatic metabolism. Quantitative data on human bioavailability remain limited and are difficult to compare across studies.
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.
| Property | Value | Notes |
|---|---|---|
| Solubility | Freely soluble in water | Also in aqueous buffers |
| Typical purity (HPLC) | 95 percent or higher | Lot-dependent |
| Dry powder storage | Minus 20 degrees Celsius | Sealed, dry, protected from light |
| Solution storage | 2 to 8 degrees Celsius | Short-term use |
| Identity confirmation | Mass spectrometry | ESI or MALDI-TOF |
Proposed mechanisms centre on modulation of the GABAergic system, with reports of altered expression of genes related to GABA-A receptor subunits and changed monoamine turnover. Some studies describe inhibition of enkephalinase, the enzyme that degrades endogenous enkephalins, which may prolong opioid peptide signalling. Effects on brain-derived neurotrophic factor and on cytokine expression have also been reported. These findings come largely from animal models and small human studies, and the precise primary target remains unresolved.
Published clinical evidence is limited. Most controlled trials were conducted in Russia, enrolled modest numbers of participants, and appeared in Russian-language journals, which restricts independent verification. Reported outcomes include lower anxiety scores, improved attention and memory measures, and changes in fatigue ratings. Reviews written in English note methodological limitations such as small samples and inconsistent endpoints. Whether the compound produces clinically meaningful benefit relative to established anxiolytics is therefore an open question rather than an established finding.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences as a structural analogue of tuftsin, a naturally occurring tetrapeptide fragment of the immunoglobulin heavy chain. The added Pro-Gly-Pro tail was intended to slow enzymatic degradation and extend biological activity. In Russia it is registered as an anxiolytic nasal preparation, while regulators elsewhere have not approved it for clinical use.
Selank is a hydrophilic peptide and dissolves readily in water and in aqueous buffers. The lyophilised powder is typically a white to off-white solid. Because short peptides are prone to hydrolysis and oxidation, handling benefits from limiting exposure to heat, moisture and strong light. Working solutions are commonly prepared in sterile water or saline, and repeated freeze-thaw cycles are avoided to reduce aggregation and loss of activity. These practices reflect general laboratory convention rather than published stability specifications.
Dry powder is normally held at -20 degrees Celsius or lower, in a sealed container with desiccant and protection from light. Reconstituted solutions are usually kept at 2 to 8 degrees Celsius for short periods and frozen for longer ones. Proline residues at several positions are generally associated with some resistance to peptidase attack, but chemical stability still declines at neutral to alkaline pH and at elevated temperature. Exact shelf-life figures are product-specific and are not standardised across suppliers.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, with mass spectrometry used to confirm molecular mass and sequence information. Amino acid analysis and peptide mapping may supplement these methods. Certified reference standards are scarce, and many commercial lots are sold as research chemicals without a pharmacopoeial monograph. Regulatory treatment differs by country: Selank is a registered prescription medicine in Russia, while in the European Union and the United States it is not an approved drug and may fall under research-chemical or unapproved-product frameworks.
Robert Joseph Wittman (born February 3, 1959) is an American politician and environmental health specialist serving as the U.S. representative for Virginia's 1st congressional district since 2007. A member of the Republican Party, his district contains portions of the Richmond suburbs and Hampton Roads area, as well as the Northern Neck and Middle Peninsula.
== Definition == Vitamin A is a fat-soluble vitamin, a category that also includes vitamins D, E and K. The vitamin encompasses several chemically related naturally occurring compounds or metabolites, i.e., vitamers, that all contain a β-ionone ring. The primary dietary form is retinol, which may have a fatty acid molecule attached, creating a retinyl ester, when stored in the liver. Retinol – the transport and storage form of vitamin A – is interconvertible with retinal, catalyzed to retinal by retinol dehydrogenases and back to retinol by retinaldehyde reductases.
== Further reading == Moses HL, Roberts AB, Derynck R (July 2016). "The Discovery and Early Days of TGF-β: A Historical Perspective". Cold Spring Harbor Perspectives in Biology. 8 (7) a021865. doi:10.1101/cshperspect.a021865. PMC 4930926. PMID 27328871.
Sources: en.wikipedia.org
== Further reading == Elsie, Robert (2019). The Albanian Bektashi: history and culture of a Dervish order in the Balkans. London: I.B. Tauris. ISBN 978-1-78831-569-2. OCLC 1108619669. Yürekli, Zeynep (2012). Architecture and hagiography in the Ottoman Empire : the politics of Bektashi shrines in the classical age. Farnham, Surrey Burlington, VT: Ashgate. ISBN 978-1-4094-1106-2. OCLC 776031990. Frashëri, Naim Bey. Fletore e Bektashinjet. Bucharest: Shtypëshkronjët të Shqipëtarëvet, 1896; Reprint: Salonica: Mbrothësia, 1909. 32 pp.
== Examples == The following is a list of human proteins containing the protein kinase domain: AAK1 ; AATK ; ABL1 ; ABL2 ; ACVR1 ; ACVR1B ; ACVR1C ; ACVR2A ; ACVR2B ; ACVRL1 ; AKT1 ; AKT2 ; AKT3 ; ALK ; AMHR2 ; ANKK1 ; ARAF ; AURKA ; AURKB ; AURKC ; AXL ; BLK ; BMP2K ; BMPR1A ; BMPR1B ; BMPR2 ; BMX ; BRAF ; BRSK1 ; BRSK2 ; BTK ; BUB1 ; BUB1B ; CAMK1 ; CAMK1D ; CAMK1G ; CAMK2A ; CAMK2B ; CAMK2D ; CAMK2G ; CAMK4 ; CAMKK1 ; CAMKK2 ; CAMKV ; CASK ; CDC42BPA ; CDC42BPB ; CDC42BPG ; CDC7 ; CDK1 ; CDK10 ; CDK11A ; CDK11B ; CDK12 ; CDK13 ; CDK14 ; CDK15 ; CDK16 ; CDK17 ; CDK18 ; CDK19 ; CDK2 ; CDK20 ; CDK3 ; CDK4 ; CDK5 ; CDK6 ; CDK7 ; CDK8 ; CDK9 ; CDKL1 ; CDKL2 ; CDKL3 ; CDKL4 ; CDKL5 ; CHEK1 ; CHEK2 ; CHUK ; CIT ; CLK1 ; CLK2 ; CLK3 ; CLK4 ; CSF1R ; CSK ; CSNK1A1 ; CSNK1A1L ; CSNK1D ; CSNK1E ; CSNK1G1 ; CSNK1G2 ; CSNK1G3 ; CSNK2A1 ; CSNK2A2 ; CSNK2A3 ; DAPK1 ; DAPK2 ; DAPK3 ; DCLK1 ; DCLK2 ; DCLK3 ; DDR1 ; DDR2 ; DMPK ; DSTYK ; DYRK1A ; DYRK1B ; DYRK2 ; DYRK3 ; DYRK4 ; EGFR ; EIF2AK1 ; EIF2AK2 ; EIF2AK3 ; EIF2AK4 ; EPHA1 ; EPHA10 ; EPHA2 ; EPHA3 ; EPHA4 ; EPHA5 ; EPHA6 ; EPHA7 ; EPHA8 ; EPHB1 ; EPHB2 ; EPHB3 ; EPHB4 ; EPHB6 ; ERBB2 ; ERBB3 ; ERBB4 ; ERN1 ; ERN2 ; FER ; FES ; FGFR1 ; FGFR2 ; FGFR3 ; FGFR4 ; FGR ; FLT1 ; FLT3 ; FLT4 ; FRK ; FYN ; GAK ; GRK1 ; GRK2 ; GRK3 ; GRK4 ; GRK5 ; GRK6 ; GRK7 ; GSG2 ; GSK3A ; GSK3B ; GUCY2C ; GUCY2D ; GUCY2F ; HCK ; HIPK1 ; HIPK2 ; HIPK3 ; HIPK4 ; HUNK ; ICK ; IGF1R ; IKBKB ; IKBKE ; ILK ; INSR ; INSRR ; IRAK1 ; IRAK2 ; IRAK3 ; IRAK4 ; ITK ; JAK1 ; JAK2 ; JAK3 ; KALRN ; KDR ; KIT ; KSR1 ; KSR2 ; LATS1 ; LATS2 ; LCK ; LIMK1 ; LIMK2 ; LMTK2 ; LMTK3 ; LRRK1 ; LRRK2 ; LTK ; LYN ; MAK ; MAP2K1 ; MAP2K2 ; MAP2K3 ; MAP2K4 ; MAP2K5 ; MAP2K6 ; MAP2K7 ; MAP3K1 ; MAP3K10 ; MAP3K11 ; MAP3K12 ; MAP3K13 ; MAP3K14 ; MAP3K15 ; MAP3K19 ; MAP3K2 ; MAP3K20 ; MAP3K21 ; MAP3K3 ; MAP3K4 ; MAP3K5 ; MAP3K6 ; MAP3K7 ; MAP3K8 ; MAP3K9 ; MAP4K1 ; MAP4K2 ; MAP4K3 ; MAP4K4 ; MAP4K5 ; MAPK1 ; MAPK10 ; MAPK11 ; MAPK12 ; MAPK13 ; MAPK14 ; MAPK15 ; MAPK3 ; MAPK4 ; MAPK6 ; MAPK7 ; MAPK8 ; MAPK9 ; MAPKAPK2 ; MAPKAPK3 ; MAPKAPK5 ; MARK1 ; MARK2 ; MARK3 ; MARK4 ; MAST1 ; MAST2 ; MAST3 ; MAST4 ; MASTL ; MATK ; MELK ; MERTK ; MET ; MINK1 ; MKNK1 ; MKNK2 ; MLKL ; MOK ; MOS ; MST1R ; MUSK ; MYLK ; MYLK2 ; MYLK3 ; MYLK4 ; MYO3A ; MYO3B ; NEK1 ; NEK10 ; NEK11 ; NEK2 ; NEK3 ; NEK4 ; NEK5 ; NEK6 ; NEK7 ; NEK8 ; NEK9 ; NIM1K ; NLK ; NPR1 ; NPR2 ; NRBP1 ; NRBP2 ; NRK ; NTRK1 ; NTRK2 ; NTRK3 ; NUAK1 ; NUAK2 ; OBSCN ; OXSR1 ; PAK1 ; PAK2 ; PAK3 ; PAK4 ; PAK5 ; PAK6 ; PAN3 ; PASK ; PBK ; PDGFRA ; PDGFRB ; PDIK1L ; PDPK1 ; PDPK2P ; PEAK1 ; PEAK3 ; PHKG1 ; PHKG2 ; PIK3R4 ; PIM1 ; PIM2 ; PIM3 ; PINK1 ; PKDCC ; PKMYT1 ; PKN1 ; PKN2 ; PKN3 ; PLK1 ; PLK2 ; PLK3 ; PLK4 ; PLK5 ; PNCK ; POMK ; PRKAA1 ; PRKAA2 ; PRKACA ; PRKACB ; PRKACG ; PRKCA ; PRKCB ; PRKCD ; PRKCE ; PRKCG ; PRKCH ; PRKCI ; PRKCQ ; PRKCZ ; PRKD1 ; PRKD2 ; PRKD3 ; PRKG1 ; PRKG2 ; PRKX ; PRKY ; PRPF4B ; PSKH1 ; PSKH2 ; PTK2 ; PTK2B ; PTK6 ; PTK7 ; PXK ; RAF1 ; RET ; RIOK1 ; RIOK2 ; RIOK3 ; RIPK1 ; RIPK2 ; RIPK3 ; RIPK4 ; RNASEL ; ROCK1 ; ROCK2 ; ROR1 ; ROR2 ; ROS1 ; RPS6KA1 ; RPS6KA2 ; RPS6KA3 ; RPS6KA4 ; RPS6KA5 ; RPS6KA6 ; RPS6KB1 ; RPS6KB2 ; RPS6KC1 ; RPS6KL1 ; RSKR ; RYK ; SBK1 ; SBK2 ; SBK3 ; SCYL1 ; SCYL2 ; SCYL3 ; SGK1 ; SGK2 ; SGK223 ; SGK3 ; SIK1 ; SIK1B ; SIK2 ; SIK3 ; SLK ; SNRK ; SPEG ; SRC ; SRMS ; SRPK1 ; SRPK2 ; SRPK3 ; STK10 ; STK11 ; STK16 ; STK17A ; STK17B ; STK24 ; STK25 ; STK26 ; STK3 ; STK31 ; STK32A ; STK32B ; STK32C ; STK33 ; STK35 ; STK36 ; STK38 ; STK38L ; STK39 ; STK4 ; STK40 ; STKLD1 ; STRADA ; STRADB ; STYK1 ; SYK ; TAOK1 ; TAOK2 ; TAOK3 ; TBCK ; TBK1 ; TEC ; TEK ; TESK1 ; TESK2 ; TEX14 ; TGFBR1 ; TGFBR2 ; TIE1 ; TLK1 ; TLK2 ; TNIK ; TNK1 ; TNK2 ; TNNI3K ; TP53RK ; TRIB1 ; TRIB2 ; TRIB3 ; TRIO ; TSSK1B ; TSSK2 ; TSSK3 ; TSSK4 ; TSSK6 ; TTBK1 ; TTBK2 ; TTK ; TTN ; TXK ; TYK2 ; TYRO3 ; UHMK1 ; ULK1 ; ULK2 ; ULK3 ; ULK4 ; VRK1 ; VRK2 ; VRK3 ; WEE1 ; WEE2 ; WNK1 ; WNK2 ; WNK3 ; WNK4 ; YES1 ; ZAP70
There is a slightly elevated expression level of FGFR1OP2 in pulmonary sarcoidosis, suggesting FGFR1OP2 operates in part of the wound healing pathway. FGFR1OP2 is strongly upregulated when compared to the control in an increased immune response triggered by the VAF347 ligand. FGFR1OP2 is upregulated in the monocyte derived dendritic cell response to the VAF347 ligand. VAF347 activates the aryl hydrocarbon receptor and acts on monocytes and naive CD4+ Th cells to promote development of IL-22 secreting Th cells. Langerhans cells show decreased expression of FGFR1OP2 with the null aryl hydrocarbon receptor (ligand is VAF347) in Mus musculus. The gene is also highly expressed compared to control samples in monocytopenia. It is expressed in cases of leukemia; it may have a linkage to the disease. FGFR1OP2 shows low expression levels in septic splenocytes in Mus musculus. FGFR1OP2 is expressed in fetal reticulocytes but not adult reticulocytes, suggesting it may play a role in the development of red blood cells.
For services to 31 Squadron Royal Air Force Association. Henry Ashley Edwards, Consultant Anaesthetist, Ysbyty Gwynedd. For services to the Welsh Medical Committee. The Reverend John Gisborne Charteris Eldrid. For services to the Samaritans. Geoffrey Kenyon Elliott. For services to Forestry and to Wood Science. Robert William Elliott, Chairperson and Director, Wiltshire & Swindon Users' Network, and Chairperson, The Jumbulance Group. For services to disabled people in Wiltshire. David John Ellis, Grade 6, Ministry of Defence. Andrew James Erving, Grade 7, Foreign and Commonwealth Office. George Stanley Etchells, Member, Rotherham Metropolitan Borough Council. For services to Local Government. Eric Magnus Eunson, lately General Manager, Power System Development, National Grid Company plc. For services to the Electricity Industry. David Roger Evans. For services to Agriculture in Wales. Gwynne Howard Neill Evans, lately Grade 6, Department for Education and Employment. David Roger Evans. For services to Agriculture in Wales. John Ivan Ellis Farmer, Honorary Show Director, All England Jumping Course, Hickstead. For services to Show Jumping. William Harold Faulkner, Headteacher, Montrose Academy. For services to Education. David Alan Fawcett. For humanitarian services in the Caribbean. Ronald Paul Feeney, Governor 2, Her Majesty's Prison Stafford. Professor Christine Elizabeth Fell, Professor of Early English Studies, University of Nottingham. For services to Early English. John Ronald Fenner, Chairman, British Urban Regeneration Association.
Sources: en.wikipedia.org
Prior to Mendel, Imre Festetics, a Hungarian noble, who lived in Kőszeg before Mendel, was the first who used the word "genetic" in hereditarian context, and is considered the first geneticist. He described several rules of biological inheritance in his work The genetic laws of nature (Die genetischen Gesetze der Natur, 1819). His second law is the same as that which Mendel published. In his third law, he developed the basic principles of mutation (he can be considered a forerunner of Hugo de Vries). Festetics argued that changes observed in the generation of farm animals, plants, and humans are the result of scientific laws. Festetics empirically deduced that organisms inherit their characteristics, not acquire them. He recognized recessive traits and inherent variation by postulating that traits of past generations could reappear later, and organisms could produce progeny with different attributes. These observations represent an important prelude to Mendel's theory of particulate inheritance insofar as it features a transition of heredity from its status as myth to that of a scientific discipline, by providing a fundamental theoretical basis for genetics in the twentieth century.
==== Stations ==== A Police Station is the basic unit of policing, responsible for prevention and detection of crime, maintenance of public order, enforcing law in general as well as for performing protection duties and making security arrangements for the constitutional authorities, government functionaries, representatives of the public in different legislative bodies and local self governments, public figures etc. A Police Station is headed by either a Sub-Inspector (lower subordinate rank), mostly in rural areas or an Inspector (an upper subordinate rank), mostly in urban areas. Police outposts are headed by a Sub-Inspector or Assistant Sub Inspector. After the year 2009 both ASI and SI have equal investigation power and both serve as duty officers.
Ionotropic receptors, otherwise known as ligand-gated ion channels, are fast acting receptors that mediate neural and physiological function by ion channel flow with ligand-binding. Nicotinic, GABA, and Glutamate receptors are among some of the cell surface receptors regulated by ligand-gated ion channel flow. GABA is the brain's main inhibitory neurotransmitter and glutamate is the brain's main excitatory neurotransmitter.
Sources: en.wikipedia.org
Reverse-phase HPLC is the usual method and gives a percentage purity value. Mass spectrometry then confirms the molecular mass. Together they provide a basic identity and purity profile for a lot.
Freeze-dried material is kept frozen, often at minus 20 degrees Celsius, and protected from light and moisture. Dissolved peptide is refrigerated for short-term use. Repeated freeze-thaw cycles are avoided.
A certificate of analysis typically lists purity by HPLC, the confirmed mass, appearance, and sometimes water or counter-ion content. It documents results for a specific batch. Details vary by supplier.
Dry powder is best kept sealed, protected from light, and held at minus 20 degrees Celsius or below. Desiccant packaging helps limit moisture uptake because the material is hygroscopic. A sealed vial should be allowed to equilibrate to room temperature before opening to reduce condensation.