Sphingosine
Sphingosine
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Sphingosine

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Sphingosine
Skeletal formula of sphingosine
Space-filling model of the sphingosine molecule
Names
Preferred IUPAC name
(2S,3R,4E)-2-Aminooctadec-4-ene-1,3-diol
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.004.230 Edit this at Wikidata
UNII
  • InChI=1S/C18H37NO2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-18(21)17(19)16-20/h14-15,17-18,20-21H,2-13,16,19H2,1H3/b15-14+/t17-,18+/m0/s1 checkY
    Key: WWUZIQQURGPMPG-KRWOKUGFSA-N checkY
  • InChI=1/C18H37NO2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-18(21)17(19)16-20/h14-15,17-18,20-21H,2-13,16,19H2,1H3/b15-14+/t17-,18+/m0/s1
    Key: WWUZIQQURGPMPG-KRWOKUGFBW
  • CCCCCCCCCCCCC/C=C/[C@H]([C@H](CO)N)O
Properties
C18H37NO2
Molar mass 299.499 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
X markN verify (what is checkYX markN ?)

Sphingosine (2-amino-4-trans-octadecene-1,3-diol) is an 18-carbon amino alcohol with an unsaturated hydrocarbon chain, which forms a primary part of sphingolipids, a class of cell membrane lipids that include sphingomyelin, an important phospholipid.

Functions

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Sphingosine can be phosphorylated in vivo via two kinases, sphingosine kinase type 1 and sphingosine kinase type 2. This leads to the formation of sphingosine-1-phosphate, a potent signaling lipid.

Sphingolipid metabolites, such as ceramides, sphingosine and sphingosine-1-phosphate, are lipid signaling molecules involved in diverse cellular processes.

Biosynthesis

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Sphingosine is synthesized from palmitoyl CoA and serine in a condensation required to yield sphinganine (dihydrosphingosine).

Sphingosine synthesis

Dehydrosphingosine is then reduced by NADPH to sphinganine, acylated to dihydroceramide, and finally oxidized by FAD to ceramide. Sphingosine is then solely formed via degradation of sphingolipid in the lysosome.

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See also

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Literature

[edit]
  • Radin N (2003). "Killing tumours by ceramide-induced apoptosis: a critique of available drugs". Biochem J. 371 (Pt 2): 243–56. doi:10.1042/BJ20021878. PMC 1223313. PMID 12558497. article
  • Carter, Herbert E.; Glick, Francis J.; Norris, William P.; Phillips, George E. (1947). "Biochemistry of the sphingolipides. III. Structure of sphingosine". J. Biol. Chem. 170 (1): 285–295. doi:10.1016/S0021-9258(17)34955-4.
[edit]
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Sphingosine

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Sphingosine is a sphingoid base and the prototypical long-chain amino alcohol that serves as the structural backbone for all sphingolipids, a major class of lipids essential to eukaryotic cell membranes.[1] Its chemical structure is defined as (2S,3R,4E)-2-aminooctadec-4-ene-1,3-diol, consisting of an 18-carbon aliphatic chain with a trans double bond between carbons 4 and 5, an amino group at carbon 2, and hydroxyl groups at carbons 1 and 3.[2] This configuration enables sphingosine to be N-acylated with fatty acids to form ceramides, which are further modified into complex sphingolipids such as sphingomyelin and glycosphingolipids.[1] The de novo biosynthesis of sphingolipids begins in the endoplasmic reticulum with the condensation of L-serine and palmitoyl-CoA, catalyzed by serine palmitoyltransferase (SPT), to produce 3-ketodihydrosphingosine, which is then reduced to sphinganine by 3-ketodihydrosphingosine reductase. Sphinganine is acylated by ceramide synthases to dihydroceramide, which is desaturated at the 4-5 position by dihydroceramide desaturase to form ceramide containing the sphingosine backbone.[2] Free sphingosine is primarily generated via the salvage pathway, where ceramidases hydrolyze ceramides or more complex sphingolipids to release free sphingosine, allowing for recycling and maintenance of sphingolipid homeostasis.[2] These biosynthetic routes are tightly regulated, as disruptions in enzymes like SPT can lead to imbalances in sphingolipid levels.[2] Biologically, sphingosine plays dual roles in cellular structure and signaling; as a component of lipid bilayers, it contributes to membrane fluidity, raft formation, and cellular recognition, while free sphingosine acts as a bioactive lipid mediator influencing processes such as cell proliferation, apoptosis, and stress responses.[1] Upon phosphorylation by sphingosine kinases, it forms sphingosine-1-phosphate (S1P), a potent signaling molecule that regulates vascular development, immune cell trafficking, and inflammation through G-protein-coupled receptors.[2] Sphingosine also exhibits antimicrobial and anticancer properties, inhibiting pathogen growth and inducing cytotoxicity in tumor cells.[1] Dysregulation of sphingosine metabolism is implicated in numerous diseases, including neurodegenerative disorders like Alzheimer's and Parkinson's, where altered sphingolipid levels affect neuronal function, and cancers such as breast and colon tumors, driven by imbalances in ceramide and S1P.[2] It is also linked to metabolic conditions like type 1 and type 2 diabetes, inflammatory diseases such as asthma, and hereditary neuropathies including HSAN1 due to SPT mutations.[2] These associations highlight sphingosine's critical role in health and its potential as a therapeutic target.[2]

Chemical Characteristics

Molecular Structure

Sphingosine is an 18-carbon aliphatic amino alcohol with the molecular formula C₁₈H₃₇NO₂ and a molar mass of 299.499 g·mol⁻¹.[3] Its preferred IUPAC name is (2S,3R,4E)-2-aminooctadec-4-ene-1,3-diol.[3] The molecule features a long hydrocarbon chain with a trans double bond between carbons 4 and 5, conferring a degree of unsaturation to the otherwise saturated alkyl backbone.[3] At one end of this chain, carbon 1 bears a primary hydroxyl group (-CH₂OH), carbon 2 has an amino group (-NH₂), and carbon 3 carries a secondary hydroxyl group (-CHOH-), forming the characteristic sphingoid base structure.[4] Sphingosine exhibits specific stereochemistry at the chiral centers, with the (2S,3R) configuration corresponding to the naturally occurring D-erythro isomer, which imparts chirality essential to its biochemical identity.[3] In terms of polarity, sphingosine possesses a hydrophilic head group consisting of the amino and hydroxyl functionalities clustered at carbons 1–3, contrasted by a hydrophobic tail formed by the extended unsaturated alkyl chain spanning carbons 5–18.[3] This amphipathic arrangement is depicted in structural representations as: 
  HO-CH₂
     |
  H₂N-CH-CH-OH
     |    |
     C=C-(CH₂)₁₂-CH₃
    (trans)
where the left side illustrates the polar head and the right the nonpolar tail.[3]

Physical and Chemical Properties

Sphingosine appears as a white to off-white crystalline solid or powder at room temperature. Reported melting points range from 67 °C to 81 °C, varying by source and conditions.[5][6][7][3] Sphingosine exhibits poor solubility in water, approximately 0.0039 mg/mL at physiological conditions, owing to its extended hydrophobic hydrocarbon chain, but demonstrates good solubility in organic solvents such as chloroform (up to 20 mg/mL), ethanol (miscible), and DMSO (1 mg/mL). This differential solubility underscores its amphipathic character, with a polar head group facilitating interactions in aqueous environments and a nonpolar tail promoting solubility in nonpolar media. For stability, sphingosine is stored at -20 °C to minimize degradation, with a shelf life of at least four years under proper conditions.[8][4][5][6] Chemically, sphingosine's reactivity stems from its functional groups: the primary hydroxyl at C1 is susceptible to phosphorylation, forming sphingosine-1-phosphate via ATP-dependent kinase activity, while the primary amino group at C2 readily undergoes acylation with fatty acids to yield ceramides. The molecule's trans double bond between C4 and C5 renders it sensitive to oxidation, potentially leading to degradation products. Relevant pKa values include approximately 9.2 for the amino group (basic) and 14.1 for the hydroxyl group (acidic), influencing its ionization and reactivity in physiological pH ranges.[4]

Biosynthesis and Metabolism

De Novo Biosynthesis

De novo biosynthesis of sphingosine occurs as part of the broader sphingolipid synthesis pathway, beginning with the condensation of L-serine and palmitoyl-CoA catalyzed by serine palmitoyltransferase (SPT), a pyridoxal 5'-phosphate-dependent enzyme complex located on the cytoplasmic face of the endoplasmic reticulum (ER). This rate-limiting step yields 3-ketosphinganine, marking the initiation of the long-chain base formation essential for sphingosine production. SPT consists of subunits encoded by genes such as SPTLC1 and SPTLC2 in mammals, ensuring specificity for the substrates and contributing to the pathway's regulation at the earliest stage.[9] The subsequent reduction of 3-ketosphinganine to sphinganine (also known as dihydrosphingosine) is mediated by 3-ketosphinganine reductase (KSR, encoded by the KDSR gene), utilizing NADPH as a cofactor and occurring within the ER. This step generates the saturated sphingoid base sphinganine, which serves as the immediate precursor for further modifications. Sphinganine is then rapidly N-acylated by one of six ceramide synthases (CerS1–6), each preferring specific acyl chain lengths, to form dihydroceramide. The desaturation of dihydroceramide to ceramide, introducing a trans double bond between carbons 4 and 5, is catalyzed by dihydroceramide desaturase 1 (DES1, encoded by DEGS1), thereby establishing the characteristic sphingosine backbone with the 4-5 unsaturation.[9][10] This entire multi-enzymatic process is confined to the ER, where the enzymes are embedded in the membrane with active sites facing the cytosol, facilitating efficient progression without free diffusion of intermediates. Pathway flux is tightly regulated, notably by ORM/ORMDL proteins, which associate with the SPT complex to inhibit its activity in response to ceramide levels, preventing overaccumulation of sphingolipids through direct binding and conformational modulation. Sphingosine itself remains transient in this de novo route, as the unsaturated base is primarily incorporated into ceramide and complex sphingolipids rather than released freely, underscoring its role as an embedded structural component rather than a stable intermediate.[9][11]

Catabolic Pathways

The catabolic pathways of sphingosine primarily involve the breakdown of complex sphingolipids to release free sphingosine, followed by its conversion to sphingosine-1-phosphate (S1P) and subsequent degradation or recycling. Ceramides, derived from the hydrolysis of sphingomyelin or glycosphingolipids, serve as key precursors in these processes.[12] In lysosomes, acid ceramidase (ASAH1) hydrolyzes ceramides to generate free sphingosine and fatty acids, representing a major route for sphingosine liberation during sphingolipid turnover.[12] Similarly, the salvage pathway recycles sphingosine through the sequential degradation of glycosphingolipids by lysosomal enzymes such as β-hexosaminidases, α-galactosidases, and glucosylceramidases, which progressively remove sugar moieties to yield ceramide and ultimately sphingosine.[13] Once released, free sphingosine is phosphorylated by sphingosine kinases to form S1P, a bioactive lipid mediator. Sphingosine kinase 1 (SK1) primarily localizes to the cytosol and plasma membrane, while sphingosine kinase 2 (SK2) is found in the nucleus and mitochondria, enabling compartment-specific regulation of S1P production.[12] This phosphorylation step is reversible and integrates catabolism with signaling functions, as S1P levels are tightly controlled to prevent accumulation.[13] S1P undergoes further catabolism through two main routes: irreversible degradation or dephosphorylation. Sphingosine-1-phosphate lyase (SPL), localized to the endoplasmic reticulum (ER), cleaves S1P into hexadecenal (a fatty aldehyde) and phosphoethanolamine, marking the terminal, irreversible step in sphingolipid breakdown.[12] Alternatively, S1P can be dephosphorylated back to sphingosine by specific phosphatases, including lipid phosphate phosphatases (LPP1-3) at the plasma membrane and S1P phosphatases (SPP1/2) in the ER, allowing for potential recycling.[13] These terminal steps are compartmentalized, with lysosomal hydrolysis initiating breakdown and ER-based enzymes handling S1P processing to maintain sphingolipid homeostasis.[12]

Biological Functions

Structural Role in Membranes

Sphingosine serves as the central backbone for sphingolipids, including sphingomyelin and glycosphingolipids, which are integral components of eukaryotic plasma membranes. This long-chain amino alcohol provides a rigid, amphipathic structure that, when acylated to form ceramide and further modified, contributes to the overall architecture of lipid bilayers by promoting tight lipid packing and stability.[14] In sphingomyelin, the sphingosine base is linked via an amide bond to a fatty acid and a phosphocholine headgroup, enabling its role as a major structural lipid alongside glycerophospholipids.[15] Sphingosine-containing sphingolipids are enriched in lipid rafts, specialized membrane domains that facilitate phase separation and modulate membrane properties, including thickness and order. These rafts, characterized by a liquid-ordered phase, arise from the preferential association of sphingolipids with cholesterol, allowing for the segregation of membrane components and supporting cellular processes like vesicular trafficking.[16] The sphingosine backbone contributes to this by influencing lipid packing density, which modulates membrane thickness—typically increasing it compared to phospholipid-dominated regions—and promotes the formation of ordered domains that resist detergent extraction.[17] Through these properties, sphingolipids help maintain membrane integrity under varying physiological conditions. Interactions between sphingosine-based sphingolipids and other membrane components involve extensive hydrogen bonding, which stabilizes associations with cholesterol and phospholipids. The hydroxyl and amide groups on the sphingosine moiety form intramolecular and intermolecular hydrogen bonds, enhancing bilayer cohesion and influencing membrane curvature to facilitate vesicle budding and fusion.[18] For instance, sphingomyelin's hydrogen bonding network with cholesterol creates a more ordered phase, reducing lateral diffusion and supporting domain stability, while interactions with phospholipids like phosphatidylcholine help balance membrane asymmetry.[19] Sphingosine-derived sphingolipids are particularly abundant in the myelin sheaths of neurons, where they constitute approximately 25-30% of total lipids, providing electrical insulation and structural support for rapid nerve conduction.[20] They are also enriched in epithelial cell membranes, contributing to barrier functions such as tight junction formation and apical-basolateral polarity.[21] This distribution underscores their role in specialized cellular architectures. The structural contributions of sphingosine to membranes are evolutionarily conserved across eukaryotes, from yeast to mammals, where the core biosynthetic pathway using serine-derived long-chain bases ensures essential barrier properties and lipid organization. Variations, such as headgroup modifications, have evolved to adapt to species-specific needs, but the fundamental sphingosine scaffold remains vital for membrane homeostasis. Recent studies as of 2025 highlight sphingolipids' roles in neurodevelopment and synaptic plasticity, emphasizing their influence on neural membrane organization.[15][22]

Signaling and Regulatory Roles

Sphingosine serves as a precursor to the bioactive lipid sphingosine-1-phosphate (S1P) through phosphorylation by sphingosine kinases (SphK1 and SphK2), enabling S1P to act as a ligand for five G-protein-coupled receptors (S1PR1–5) that mediate diverse signaling cascades.[23] These receptors regulate key cellular processes such as migration, survival, and vascular permeability; for instance, S1PR1 promotes cell migration and survival via Gi-coupled pathways, while S1PR2 and S1PR3 influence vascular tone and barrier integrity through Gq/12/13 signaling.[23] In addition to its derivative, free sphingosine exerts direct regulatory effects by competitively inhibiting protein kinase C (PKC) isoforms, thereby disrupting downstream phosphorylation events that control cell proliferation and differentiation.[24] Sphingosine and S1P are integral to several intracellular pathways, including the activation of Rho GTPases, which modulate cytoskeletal dynamics and cell motility, particularly via S1PR2-mediated RhoA-ROCK signaling.[25] They also intersect with the MAPK/ERK pathway to influence cell growth and stress responses, where S1P stimulation through S1PR1 or S1PR3 activates ERK1/2 phosphorylation, promoting survival signals in response to growth factors.[23] Furthermore, sphingosine signaling engages NF-κB pathways to regulate inflammation, with S1PR2 activation suppressing proinflammatory responses by inhibiting NF-κB translocation in immune cells.[25] The balance between sphingosine-derived S1P (pro-survival) and ceramides (pro-apoptotic) dictates apoptotic outcomes; elevated sphingosine levels can enhance apoptosis by downregulating anti-apoptotic Bcl-2 proteins, while S1P counters this by activating prosurvival kinase cascades.[26] In tissue-specific contexts, sphingosine signaling is critical for immune cell trafficking, where extracellular S1P gradients guide lymphocyte egress from lymphoid organs via S1PR1, facilitating directed migration to peripheral tissues.[27] Similarly, in endothelial cells, S1P maintains barrier function by reinforcing adherens junctions and cortical actin through S1PR1-mediated Rac activation, thereby regulating vascular permeability and integrity.[28] These roles underscore sphingosine's position as a dynamic regulator, distinct from its static incorporation into membrane sphingolipids as a reservoir for bioactive metabolites. Recent advances as of 2025 further elucidate S1P's pivotal role in mammalian nervous system functions, including neuroprotection and circuit formation.[23][29]

Clinical and Research Implications

Involvement in Diseases

Sphingosine and its metabolites, particularly sphingosine-1-phosphate (S1P), play critical roles in cancer pathogenesis through dysregulation of sphingolipid signaling pathways. Elevated sphingosine kinase 1 (SphK1) activity leads to increased S1P production, which promotes tumor growth and metastasis in breast cancer by stimulating angiogenesis and lymphangiogenesis.[30] In triple-negative breast cancer, SphK2-derived S1P activates the PAK1/LIMK1/cofilin-1 signaling axis, enhancing cell migration and metastatic potential.[31] Similarly, in non-small cell lung cancer, the SphK1/S1P/S1PR3 pathway drives tumor progression and contributes to therapeutic resistance.[32] These mechanisms highlight how S1P export from cancer cells amplifies pro-tumorigenic environments, including immune evasion in melanoma models via SphK1 overexpression.[33] Inflammatory diseases such as atherosclerosis and rheumatoid arthritis are associated with sphingolipid imbalances that favor ceramide accumulation over sphingosine-derived metabolites, exacerbating endothelial dysfunction. Ceramides, resulting from disrupted sphingosine metabolism, induce endothelial cell injury and predict cardiovascular events independently of other risk factors in atherosclerosis.[34] This accumulation sustains chronic inflammation by promoting epithelial damage and cytokine release.[35] In rheumatoid arthritis, similar ceramide buildup contributes to synovial inflammation and joint destruction through altered vascular integrity.[35] Dysregulated S1P signaling further impairs endothelial barrier function, amplifying inflammatory cascades in these conditions.[36] Neurodegenerative disorders involve sphingosine dysregulation, notably in Farber disease and Alzheimer's disease. Farber disease arises from acid ceramidase deficiency, which impairs the conversion of ceramide to sphingosine, resulting in ceramide accumulation, lysosomal lipid storage, and widespread inflammation across multiple tissues.[37] This leads to multisystem pathology, including granulomatous lesions and progressive organ failure.[38] In Alzheimer's disease, altered sphingosine-1-phosphate and ceramide levels interact with amyloid-β peptides, influencing their production, secretion, and aggregation, thereby contributing to neuronal toxicity and plaque formation.[39] Sphingosine itself binds directly to amyloid-β(1-42), modulating its aggregation propensity and exacerbating neuroinflammatory responses.[40] Cardiovascular pathologies, including heart failure and fibrosis, are linked to S1P dysregulation stemming from sphingolipid metabolic imbalances. In post-myocardial infarction heart failure, excessive angiotensin II induces sphingolipid disorders, elevating S1P levels and impairing cardiac remodeling.[41] Dihydrosphingosine-1-phosphate, a sphingosine analog, promotes collagen synthesis in cardiac fibroblasts via JAK/STAT/TIMP1 signaling, driving myocardial fibrosis.[42] Overall S1P disbalance disrupts vascular tone, endothelial integrity, and myocyte autophagy, contributing to ventricular dysfunction and fibrotic progression.[43] Infectious diseases highlight how pathogens exploit sphingosine pathways for immune evasion. Pseudomonas aeruginosa, an opportunistic bacterium, produces ceramidases that degrade host sphingomyelin into sphingosine, altering airway epithelial sphingolipid homeostasis to suppress innate immune responses and facilitate infection persistence.[44] This manipulation blocks antimicrobial signaling and promotes bacterial survival in the lung microenvironment.[45] Recent investigations through 2025 have extended these insights to viral infections, implicating sphingosine metabolites in COVID-19-associated inflammation and autophagy defects. Elevated ceramide/S1P ratios in severe COVID-19 cases correlate with hyperinflammation and impaired lysosomal autophagy in pulmonary cells, exacerbating tissue damage.[46] As of 2025, proteomic and metabolomic studies continue to reveal upregulated sphingosine-related metabolites, such as derysphingosine, in convalescent COVID-19 patients, linking them to persistent physiologic derangements.[47][48] These findings underscore sphingolipid dysregulation as a modulator of post-viral immune pathology.[49]

Therapeutic Applications

Therapeutic applications of sphingosine-related pathways primarily involve modulating enzymes and receptors in the sphingolipid metabolism to treat immune-mediated, inflammatory, and storage disorders. Sphingosine-1-phosphate (S1P), derived from sphingosine via sphingosine kinases, serves as a key signaling molecule targeted by these interventions. Dysregulation of these pathways occurs in conditions such as multiple sclerosis, ulcerative colitis, lysosomal storage diseases, and cancer, where therapeutic strategies aim to restore balance. Fingolimod (FTY720), a sphingosine analog and sphingosine kinase substrate, is an approved oral therapy for relapsing multiple sclerosis. Upon phosphorylation, it acts as a high-affinity agonist for S1P receptors, particularly S1P1, on lymphocytes, leading to receptor internalization and sequestration of immune cells in lymph nodes, thereby reducing their egress to inflammatory sites in the central nervous system.[50][51] Modulators of ceramidases, enzymes that generate sphingosine from ceramide, are under investigation for lysosomal storage disorders like Farber disease, caused by acid ceramidase deficiency and resulting in ceramide accumulation. Gene therapy approaches, such as adeno-associated virus-mediated delivery of the ASAH1 gene encoding acid ceramidase, have shown promise in preclinical models by restoring enzyme activity and normalizing sphingosine levels.[52] Small molecule inhibitors of acid ceramidase, identified through pharmacophore modeling, are being explored to fine-tune ceramide-sphingosine balance, with potential applications in restoring lysosomal function.[53][54] S1P receptor modulators offer targeted therapies for inflammatory and oncologic conditions. Ozanimod, a selective S1P1 and S1P5 receptor agonist, is approved for moderately to severely active ulcerative colitis, where it promotes lymphocyte retention in lymphoid tissues, reducing gut inflammation and achieving clinical remission in induction and maintenance trials.[55] In cancer chemotherapy, S1P receptor antagonists enhance apoptosis by blocking S1P-mediated survival signals; for instance, inhibiting S1P signaling sensitizes tumor cells to chemotherapeutic agents, promoting cell death pathways in preclinical models of various cancers.00060-2) Emerging therapies as of 2025 leverage sphingosine pathway inhibitors for acute inflammatory conditions. A Phase 2/3 trial of the sphingosine kinase-2 inhibitor opaganib (ABC294640) for severe COVID-19 pneumonia did not meet its primary endpoint, although earlier studies demonstrated potential anti-inflammatory effects. As of 2025, opaganib is under investigation in Phase 2 trials for other conditions, including metastatic castration-resistant prostate cancer in combination with darolutamide.[56][57] Key challenges in sphingosine-targeted therapies include balancing S1P's context-dependent pro-survival and anti-apoptotic effects, which can promote both beneficial immunosuppression and unintended cell protection in tumors or inflamed tissues.[58] Plasma S1P levels serve as a potential biomarker for monitoring therapeutic efficacy and disease progression, with elevations correlating to inflammatory states in conditions like obesity and cardiovascular disease.[59]

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