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1.
Genet Med ; 26(1): 100995, 2024 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-37838930

RESUMEN

PURPOSE: Genome sequencing (GS) is one of the most comprehensive assays that interrogate single-nucleotide variants, copy number variants, mitochondrial variants, repeat expansions, and structural variants in a single assay. Despite the clear technical superiority, the full clinical utility of GS has yet to be determined. METHODS: We systematically evaluated 2100 clinical GS index cases performed in our laboratory to explore the diagnostic yield of GS as first-tier and as follow-up testing. RESULTS: The overall diagnostic yield was 28% (585/2100). The diagnostic yield for GS as the first-tier test was 26% (294/1146). Among cases with prior non-diagnostic genetic tests, GS provided a diagnosis for 27% (247/910) of cases, including 56 cases with prior exome sequencing (ES). Although re-analysis of previous ES might have resolved the diagnosis in 29 cases, diagnoses for 27 cases would have been missed because of the technical inferiority of ES. Moreover, GS further disclosed additional genetic etiology in 3 out of 44 cases with existing partial diagnosis. CONCLUSION: We present the largest-to-date GS data set of a clinically heterogeneous cohort from a single clinical laboratory. Our data demonstrate that GS should be considered as the first-tier genetic test that has the potential to shorten the diagnostic odyssey.


Asunto(s)
Exoma , Pruebas Genéticas , Humanos , Exoma/genética , Secuencia de Bases , Mapeo Cromosómico , Secuenciación del Exoma
2.
Br J Haematol ; 198(1): 155-164, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-35411940

RESUMEN

Red blood cells (RBCs) lose plasma membrane in the spleen as they age, but the cells and molecules involved are yet to be identified. Sickle cell disease and infection by Plasmodium falciparum cause oxidative stress that induces aggregates of cross-linked proteins with N-linked high-mannose glycans (HMGs). These glycans can be recognised by mannose-binding lectins, including the mannose receptor (CD206), expressed on macrophages and specialised phagocytic endothelial cells in the spleen to mediate the extravascular haemolysis characteristic of these diseases. We postulated this system might also mediate removal of molecules and membrane in healthy individuals. Surface expression of HMGs on RBCs from patients who had previously undergone splenectomy was therefore assessed: high levels were indeed observable as large membrane aggregates. Glycomic analysis by mass spectrometry identified a mixture of Man5-9 GlcNAc2 structures. HMG levels correlated well with manual pit counts (r = 0.75-0.85). To assess further whether HMGs might act as a splenic reticuloendothelial function test, we measured levels on RBCs from patients with potential functional hyposplenism, some of whom exhibited high levels that may indicate risk of complications.


Asunto(s)
Membrana Eritrocítica , Manosa , Células Endoteliales , Humanos , Polisacáridos , Esplenectomía
3.
Dig Dis ; 40(3): 290-298, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-34034254

RESUMEN

BACKGROUND: Functional hyposplenism is a recognized complication of several gastroenterological disorders, including coeliac and inflammatory bowel diseases, and is believed to contribute to the increased infection risk seen in these disorders. SUMMARY: The mechanisms of hyposplenism are poorly understood. In this article, we review possible mechanisms underlying development of functional hyposplenism and discuss implications for its management. KEY MESSAGES: Identifying functional hyposplenism is important, as it may permit earlier recognition and treatment of serious infections through patient education and vaccination.


Asunto(s)
Enfermedades Gastrointestinales , Enfermedades del Bazo , Enfermedades Gastrointestinales/complicaciones , Humanos , Enfermedades del Bazo/complicaciones , Enfermedades del Bazo/terapia
4.
Hum Mutat ; 42(5): 626-638, 2021 05.
Artículo en Inglés | MEDLINE | ID: mdl-33644936

RESUMEN

Molecular diagnosis for Duchenne and Becker muscular dystrophies (DMD/BMD) involves a two-tiered approach for detection of deletions/duplications using MLPA or array CGH, followed by sequencing of coding and flanking intronic regions to detect sequence variants, which is time-consuming and expensive. We have developed a comprehensive next-generation sequencing (NGS)-based single-step assay to sequence the entire 2.2 Mb of the DMD gene to detect all copy number and sequence variants in both index males and carrier females. Assay validation was 100% concordant with other methodologies. A total of 772 samples have been tested, of which 62% (N = 480) were index cases with a clinical suspicion of DMD. Carrier testing females account for 38% (N = 292). Molecular diagnosis was confirmed in 86% (N = 413) of the index cases. Intragenic deletions and duplications (single-exon or multi-exon) were detected in 60% (N = 247) and 14% (N = 58) of the index cases, respectively. Full-sequence analysis of the entire gene allows for detection of deep intronic pathogenic variants and accurate breakpoint detection of CNVs involving similar exons, which could have an impact on the outcome of clinical trials. This comprehensive assay is highly sensitive for diagnostic testing for DMD and is also suitable for confirmatory testing for newborn screening for DMD.


Asunto(s)
Distrofia Muscular de Duchenne , Tamizaje Neonatal , Distrofina/genética , Exones/genética , Femenino , Eliminación de Gen , Genómica , Secuenciación de Nucleótidos de Alto Rendimiento , Humanos , Recién Nacido , Masculino , Distrofia Muscular de Duchenne/diagnóstico , Distrofia Muscular de Duchenne/genética
5.
J Proteome Res ; 13(11): 4821-32, 2014 Nov 07.
Artículo en Inglés | MEDLINE | ID: mdl-24946017

RESUMEN

Glycan moieties of glycoproteins modulate many biological processes in mammals, such as immune response, inflammation, and cell signaling. Numerous studies show that many human diseases are correlated with quantitative alteration of protein glycosylation. In some cases, these changes can occur for certain types of glycans over specific sites in a glycoprotein rather than on the global abundance of the glycoprotein. Conventional analytical techniques that analyze the abundance of glycans cleaved from glycoproteins cannot reveal these subtle effects. Here we present a novel statistical method to quantify the site-specific glycosylation of glycoproteins in complex samples using label-free mass spectrometric techniques. Abundance variations between sites of a glycoprotein as well as different glycoforms, that is, glycopeptides with different glycans attached to the same site, can be detected using these techniques. We applied our method to an esophageal cancer study based on blood serum samples from cancer patients in an attempt to detect potential biomarkers of site-specific N-linked glycosylation. A few glycoproteins, including vitronectin, showed significantly different site-specific glycosylations within cancer/control samples, indicating that our method is ready to be used for the discovery of glycosylated biomarkers.


Asunto(s)
Biomarcadores de Tumor/sangre , Neoplasias Esofágicas/metabolismo , Regulación Neoplásica de la Expresión Génica/fisiología , Glicopéptidos/análisis , Proteómica/métodos , Espectrometría de Masas en Tándem/métodos , Análisis de Varianza , Cromatografía Liquida , Regulación Neoplásica de la Expresión Génica/genética , Glicosilación , Humanos , Modelos Estadísticos , Polisacáridos/química
8.
J R Coll Physicians Edinb ; 54(1): 74-83, 2024 03.
Artículo en Inglés | MEDLINE | ID: mdl-38548714

RESUMEN

Venous thromboembolism (VTE) is frequently encountered across various specialties. The management of VTE has become more nuanced, requiring consideration of several factors when deciding on the choice and duration of anticoagulation. This evidence-based review article summarises the current practice and evidence behind anticoagulation in VTE, incorporating national and international guidelines. Factors influencing decision-making around the choice and duration of anticoagulation, along with special circumstances such as cancer and antiphospholipid syndrome, are discussed. The clinical utility of thrombophilia screening is also addressed.


Asunto(s)
Médicos , Tromboembolia Venosa , Humanos , Tromboembolia Venosa/diagnóstico , Tromboembolia Venosa/tratamiento farmacológico , Tromboembolia Venosa/prevención & control , Anticoagulantes/uso terapéutico , Servicios de Salud , Factores de Riesgo
9.
J R Coll Physicians Edinb ; 54(1): 29-33, 2024 03.
Artículo en Inglés | MEDLINE | ID: mdl-38160201

RESUMEN

Haemophagocytic lymphohistiocytosis (HLH) is a rare, aggressive, excess immune activation syndrome. Diagnosis can be challenging due to its several clinical mimics including sepsis. There are multiple aetiologies of HLH; in adults, it is most commonly triggered by infection, malignancy, drugs and autoimmune processes. Failure to rapidly diagnose and treat this condition can be fatal. The management of HLH includes identifying and removing the trigger, supportive management and immunosuppression. Identifying the trigger is essential to inform the most appropriate type of immunosuppression. Here, we report a case of likely drug-induced HLH in a patient recently treated for hairy cell leukaemia. The culprit drug was thought to be co-trimoxazole and this case report highlights a very rare complication of this commonly used drug. We discuss our management approach with steroid monotherapy and withdrawal of co-trimoxazole.


Asunto(s)
Leucemia de Células Pilosas , Linfohistiocitosis Hemofagocítica , Neoplasias , Sepsis , Humanos , Leucemia de Células Pilosas/complicaciones , Leucemia de Células Pilosas/tratamiento farmacológico , Linfohistiocitosis Hemofagocítica/inducido químicamente , Linfohistiocitosis Hemofagocítica/diagnóstico , Linfohistiocitosis Hemofagocítica/tratamiento farmacológico , Neoplasias/complicaciones , Combinación Trimetoprim y Sulfametoxazol/efectos adversos , Masculino , Persona de Mediana Edad
10.
JAMA Netw Open ; 6(7): e2326445, 2023 07 03.
Artículo en Inglés | MEDLINE | ID: mdl-37523181

RESUMEN

Importance: Although the clinical utility of genome sequencing for critically ill children is well recognized, its utility for proactive pediatric screening is not well explored. Objective: To evaluate molecular findings from screening ostensibly healthy children with genome sequencing compared with a gene panel for medically actionable pediatric conditions. Design, Setting, and Participants: This case series study was conducted among consecutive, apparently healthy children undergoing proactive genetic screening for pediatric disorders by genome sequencing (n = 562) or an exome-based panel of 268 genes (n = 606) from March 1, 2018, through July 31, 2022. Exposures: Genetic screening for pediatric-onset disorders using genome sequencing or an exome-based panel of 268 genes. Main Outcomes and Measures: Molecular findings indicative of genetic disease risk. Results: Of 562 apparently healthy children (286 girls [50.9%]; median age, 29 days [IQR, 9-117 days]) undergoing screening by genome sequencing, 46 (8.2%; 95% CI, 5.9%-10.5%) were found to be at risk for pediatric-onset disease, including 22 children (3.9%) at risk for high-penetrance disorders. Sequence analysis uncovered molecular diagnoses among 32 individuals (5.7%), while copy number variant analysis uncovered molecular diagnoses among 14 individuals (2.5%), including 4 individuals (0.7%) with chromosome scale abnormalities. Overall, there were 47 molecular diagnoses, with 1 individual receiving 2 diagnoses; of the 47 potential diagnoses, 22 (46.8%) were associated with high-penetrance conditions. Pathogenic variants in medically actionable pediatric genes were found in 6 individuals (1.1%), constituting 12.8% (6 of 47) of all diagnoses. At least 1 pharmacogenomic variant was reported for 89.0% (500 of 562) of the cohort. In contrast, of 606 children (293 girls [48.3%]; median age, 26 days [IQR, 10-67 days]) undergoing gene panel screening, only 13 (2.1%; 95% CI, 1.0%-3.3%) resulted in potential childhood-onset diagnoses, a significantly lower rate than those screened by genome sequencing (P < .001). Conclusions and Relevance: In this case series study, genome sequencing as a proactive screening approach for children, due to its unrestrictive gene content and technical advantages in comparison with an exome-based gene panel for medically actionable childhood conditions, uncovered a wide range of heterogeneous high-penetrance pediatric conditions that could guide early interventions and medical management.


Asunto(s)
Pruebas Genéticas , Genómica , Femenino , Niño , Humanos , Recién Nacido , Penetrancia , Exoma
11.
BMC Bioinformatics ; 13 Suppl 17: S7, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-23282245

RESUMEN

BACKGROUND: Computational methods utilizing the structural and functional information help to understand specific molecular recognition events between the target biomolecule and candidate hits and make it possible to design improved lead molecules for the target. RESULTS: Sanjeevini represents a massive on-going scientific endeavor to provide to the user, a freely accessible state of the art software suite for protein and DNA targeted lead molecule discovery. It builds in several features, including automated detection of active sites, scanning against a million compound library for identifying hit molecules, all atom based docking and scoring and various other utilities to design molecules with desired affinity and specificity against biomolecular targets. Each of the modules is thoroughly validated on a large dataset of protein/DNA drug targets. CONCLUSIONS: The article presents Sanjeevini, a freely accessible user friendly web-server, to aid in drug discovery. It is implemented on a tera flop cluster and made accessible via a web-interface at http://www.scfbio-iitd.res.in/sanjeevini/sanjeevini.jsp. A brief description of various modules, their scientific basis, validation, and how to use the server to develop in silico suggestions of lead molecules is provided.


Asunto(s)
Descubrimiento de Drogas/métodos , Internet , Programas Informáticos , Proteínas/química , Proteínas/metabolismo
12.
EJHaem ; 3(4): 1305-1309, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-36467813

RESUMEN

Hydroxycarbamide (HC) is used as a cytoreductive treatment in myeloproliferative neoplasms (MPN). Observational studies have raised the possibility that HC contributes to the development of secondary malignancies, including skin tumours in MPN patients. In this retrospective observational study, we report a single-centre experience of 324 HC-treated MPN patients with long-term follow-up, compared to 47 MPN patients not on HC. Thirty-three patients (10.2%) (HC) versus one patient (2.1%) (no HC) developed skin tumours during follow-up (Hazard ratios [HR] 5.70, 95% confidence intervals 0.66-48.09, p = 0.112). However, male gender, age at MPN diagnosis, type of MPN (polycythaemia rubra vera) and previous history of skin cancer were prognostic variables associated with development of skin cancer.

14.
J R Coll Physicians Edinb ; 50(3): 322-329, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32936114

RESUMEN

Sarcoidosis remains difficult to diagnose, assess and treat. The last decade has brought significant diagnostic and therapeutic advances in the field of sarcoidosis including endobronchial ultrasound, F-fluorodeoxyglucose positron emission tomography and biologics. In this article we use clinical vignettes to discuss commonly encountered cases to illustrate and explain the application of these, and other advances.


Asunto(s)
Sarcoidosis Pulmonar , Sarcoidosis , Fluorodesoxiglucosa F18 , Humanos , Tomografía de Emisión de Positrones , Radiofármacos , Sarcoidosis/diagnóstico , Sarcoidosis/terapia , Sarcoidosis Pulmonar/diagnóstico por imagen , Sarcoidosis Pulmonar/terapia
15.
J R Coll Physicians Edinb ; 50(2): 181-187, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32568296

RESUMEN

Intravenous (IV) fluid therapy is integral to the care of patients in hospitals but involves complex decisions. Errors in fluid prescribing are common, leading to significant harm due to inappropriate fluid type, rate or volume. British national guidelines have been developed to improve prescribing, but adherence has been generally poor. The Scottish Government has set up a National IV Fluid Improvement Programme to implement national guidelines throughout Scotland. This article reviews the need for such guidance and discusses how the Scottish National IV Fluid Improvement Programme hopes to achieve its aims across Scotland. This may provide an improvement framework for fluid prescribing in other regions.


Asunto(s)
Fluidoterapia , Hospitales , Administración Intravenosa , Humanos , Escocia
16.
J Mol Diagn ; 22(6): 823-840, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32344035

RESUMEN

DNA copy number variants (CNVs) account for approximately 300 Mb of sequence variation in the normal human genome. Significant numbers of pathogenic CNVs contribute toward human genetic disorders. Recent studies suggest a higher diagnostic and clinical significance of low-pass genome sequencing (LP-GS) compared with chromosomal microarrays (CMAs). The performance metrics of the 5X LP-GS was compared with CMA to validate a low-cost and high-throughput method. LP-GS test performed on 409 samples (including 78 validation and 331 clinical) was evaluated using American College of Medical Genetics and Genomics guidelines. The CNV accuracy, precision, specificity, and sensitivity were calculated to be 100% for all previously characterized CNVs by CMA. Samples (n = 6) run at both approximately 30X GS and approximately 5X GS (LP-GS) average depth detected a concordance of 89.43% to 91.8% and 77.42% to 89.86% for overall single-nucleotide variants and insertions/deletions, respectively. In the 331 clinical samples, 17.2% each were classified as pathogenic/likely pathogenic and uncertain clinical significance. In addition, several cases with pathogenic CNVs were detected that were missed by CMA. This study demonstrates that LP-GS (5X GS) was able to reliably detect absence of heterozygosity, microdeletion/microduplication syndromes, and intragenic CNVs with higher coverage and resolution over the genome. Because of lower cost, higher resolution, and greater sensitivity of this test, our study in combination with other reports could be used in an evidence-based review by professional societies to recommend replacing CMAs.


Asunto(s)
Mapeo Cromosómico/métodos , Variaciones en el Número de Copia de ADN , Pruebas Genéticas/métodos , Genoma Humano , Secuenciación de Nucleótidos de Alto Rendimiento/métodos , Análisis por Micromatrices/métodos , Secuenciación Completa del Genoma/métodos , Adolescente , Secuencia de Bases , Niño , Exactitud de los Datos , Eliminación de Gen , Genómica/métodos , Humanos , Lactante , Masculino , Mutagénesis Insercional , Polimorfismo de Nucleótido Simple , Sensibilidad y Especificidad
18.
J Immunol Res ; 2019: 1845128, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31098385

RESUMEN

RATIONALE: Idiopathic pulmonary fibrosis (IPF) is a progressive fibrotic interstitial lung disease, with high mortality. Currently, the aetiology and the pathology of IPF are poorly understood, with both innate and adaptive responses previously being implicated in the disease pathogenesis. Heat shock proteins (Hsp) and antibodies to Hsp in patients with IPF have been suggested as therapeutic targets and prognostic biomarkers, respectively. We aimed to study the relationship between the expression of Hsp72 and anti-Hsp72 antibodies in the BAL fluid and serum Aw disease progression in patients with IPF. METHODS: A novel indirect ELISA to measure anti-Hsp72 IgG was developed and together with commercially available ELISAs used to detect Hsp72 IgG, Hsp72 IgGAM, and Hsp72 antigen, in the serum and BALf of a cohort of IPF (n = 107) and other interstitial lung disease (ILD) patients (n = 66). Immunohistochemistry was used to detect Hsp72 in lung tissue. The cytokine expression from monocyte-derived macrophages was measured by ELISA. RESULTS: Anti-Hsp72 IgG was detectable in the serum and BALf of IPF (n = 107) and other ILDs (n = 66). Total immunoglobulin concentrations in the BALf showed an excessive adaptive response in IPF compared to other ILDs and healthy controls (p = 0.026). Immunohistochemistry detection of C4d and Hsp72 showed that these antibodies may be targeting high expressing Hsp72 type II alveolar epithelial cells. However, detection of anti-Hsp72 antibodies in the BALf revealed that increasing concentrations were associated with improved patient survival (adjusted HR 0.62, 95% CI 0.45-0.85; p = 0.003). In vitro experiments demonstrate that anti-Hsp72 complexes stimulate macrophages to secrete CXCL8 and CCL18. CONCLUSION: Our results indicate that intrapulmonary anti-Hsp72 antibodies are associated with improved outcomes in IPF. These may represent natural autoantibodies, and anti-Hsp72 IgM and IgA may provide a beneficial role in disease pathogenesis, though the mechanism of action for this has yet to be determined.


Asunto(s)
Células Epiteliales Alveolares/metabolismo , Autoanticuerpos/metabolismo , Proteínas del Choque Térmico HSP72/metabolismo , Fibrosis Pulmonar Idiopática/inmunología , Pulmón/inmunología , Macrófagos/fisiología , Adulto , Anciano , Anciano de 80 o más Años , Células Cultivadas , Quimiocinas CC/metabolismo , Progresión de la Enfermedad , Femenino , Proteínas del Choque Térmico HSP72/genética , Proteínas del Choque Térmico HSP72/inmunología , Humanos , Fibrosis Pulmonar Idiopática/mortalidad , Interleucina-8/metabolismo , Masculino , Persona de Mediana Edad , Análisis de Supervivencia
19.
Pancreas ; 45(9): 1347-52, 2016 10.
Artículo en Inglés | MEDLINE | ID: mdl-27171515

RESUMEN

OBJECTIVES: The aim of this study was to determine if comprehensive genetic testing was useful to identify genetic variants that discriminate chronic pancreatitis (CP) from acute recurrent pancreatitis (ARP) in a pediatric population. METHODS: We conducted a retrospective review of 50 patients enrolled in our institutional pancreatitis registry between April 2013 and January 2015. Genetic analysis of PRSS1, CFTR, SPINK1, and CTRC classified variants as mutations or variants of unknown clinical significance and the minor allele frequency of variants in our cohort was obtained. RESULTS: Genetic testing was obtained in 16/16 (100%) of CP and 29/34 (85%) of ARP patients. A total of 39 genetic variants were found in 27 (60%) of 45 subjects tested with 5 (11%) subjects having 2 different genes affected. Variant frequency was greatest in patients for CFTR (17/45, 38%) followed by SPINK1 (11/44, 25%), CTRC (2/27, 7%), and PRSS1 (2/44, 4%). CFTR variants were more likely in those with CP compared to ARP (63% and 24%, P = 0.01). CONCLUSIONS: This study is the first to find a higher rate of CFTR mutations in CP versus ARP groups using comprehensive genetic testing in a pediatric population.


Asunto(s)
Pancreatitis Crónica , Proteínas Portadoras , Niño , Regulador de Conductancia de Transmembrana de Fibrosis Quística , Predisposición Genética a la Enfermedad , Humanos , Mutación , Recurrencia , Estudios Retrospectivos , Tripsina , Inhibidor de Tripsina Pancreática de Kazal
20.
PLoS One ; 11(8): e0156738, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27483465

RESUMEN

BACKGROUND & AIMS: The etiology of acute liver failure (ALF) remains elusive in almost half of affected children. We hypothesized that inherited mitochondrial and fatty acid oxidation disorders were occult etiological factors in patients with idiopathic ALF and impaired energy metabolism. METHODS: Twelve patients with elevated blood molar lactate/pyruvate ratio and indeterminate etiology were selected from a retrospective cohort of 74 subjects with ALF because their fixed and frozen liver samples were available for histological, ultrastructural, molecular and biochemical analysis. RESULTS: A customized next-generation sequencing panel for 26 genes associated with mitochondrial and fatty acid oxidation defects revealed mutations and sequence variants in five subjects. Variants involved the genes ACAD9, POLG, POLG2, DGUOK, and RRM2B; the latter not previously reported in subjects with ALF. The explanted livers of the patients with heterozygous, truncating insertion mutations in RRM2B showed patchy micro- and macrovesicular steatosis, decreased mitochondrial DNA (mtDNA) content <30% of controls, and reduced respiratory chain complex activity; both patients had good post-transplant outcome. One infant with severe lactic acidosis was found to carry two heterozygous variants in ACAD9, which was associated with isolated complex I deficiency and diffuse hypergranular hepatocytes. The two subjects with heterozygous variants of unknown clinical significance in POLG and DGUOK developed ALF following drug exposure. Their hepatocytes displayed abnormal mitochondria by electron microscopy. CONCLUSION: Targeted next generation sequencing and correlation with histological, ultrastructural and functional studies on liver tissue in children with elevated lactate/pyruvate ratio expand the spectrum of genes associated with pediatric ALF.


Asunto(s)
Metabolismo Energético , Secuenciación de Nucleótidos de Alto Rendimiento , Fallo Hepático Agudo/genética , Fallo Hepático Agudo/patología , Hígado/patología , Mutación , Adolescente , Niño , Preescolar , ADN Mitocondrial/genética , Femenino , Variación Genética , Humanos , Lactante , Recién Nacido , Hígado/metabolismo , Fallo Hepático Agudo/metabolismo , Masculino , Mitocondrias/genética , Mitocondrias/metabolismo , Mitocondrias/patología , Estudios Retrospectivos
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