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  1. Article ; Online: The fungal pattern recognition receptor, Dectin-1, and the associated cluster of C-type lectin-like receptors.

    Huysamen, Cristal / Brown, Gordon D

    FEMS microbiology letters

    2008  Volume 290, Issue 2, Page(s) 121–128

    Abstract: The mammalian natural killer gene complex (NKC) contains several families of type II transmembrane C-type lectin-like receptors (CLRs) that are best known for their involvement in the detection of virally infected or transformed cells, through the ... ...

    Abstract The mammalian natural killer gene complex (NKC) contains several families of type II transmembrane C-type lectin-like receptors (CLRs) that are best known for their involvement in the detection of virally infected or transformed cells, through the recognition of endogenous (or self) proteinacious ligands. However, certain CLR families within the NKC, particularly those expressed by myeloid cells, recognize structurally diverse ligands and perform a variety of other immune and homoeostatic functions. One such family is the 'Dectin-1 cluster' of CLRs, which includes MICL, CLEC-2, CLEC12B, CLEC9A, CLEC-1, Dectin-1 and LOX-1. Here, we review each of these CLRs, exploring our current understanding of their ligands and functions and highlighting where they have provided new insights into the underlying mechanisms of immunity and homeostasis.
    MeSH term(s) Animals ; Fungi/immunology ; Humans ; Lectins, C-Type/immunology ; Membrane Proteins/immunology ; Mycoses/immunology ; Mycoses/microbiology ; Nerve Tissue Proteins/immunology ; Receptors, Mitogen/immunology ; Receptors, Pattern Recognition/immunology
    Chemical Substances Lectins, C-Type ; Membrane Proteins ; Nerve Tissue Proteins ; Receptors, Mitogen ; Receptors, Pattern Recognition ; dectin 1
    Language English
    Publishing date 2008-01-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 752343-9
    ISSN 1574-6968 ; 0378-1097
    ISSN (online) 1574-6968
    ISSN 0378-1097
    DOI 10.1111/j.1574-6968.2008.01418.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: The fungal pattern recognition receptor, Dectin-1, and the associated cluster of C-type lectin-like receptors

    Huysamen, Cristal / Brown, Gordon D

    FEMS microbiology letters. 2009 Jan., v. 290, no. 2

    2009  

    Abstract: The mammalian natural killer gene complex (NKC) contains several families of type II transmembrane C-type lectin-like receptors (CLRs) that are best known for their involvement in the detection of virally infected or transformed cells, through the ... ...

    Abstract The mammalian natural killer gene complex (NKC) contains several families of type II transmembrane C-type lectin-like receptors (CLRs) that are best known for their involvement in the detection of virally infected or transformed cells, through the recognition of endogenous (or self) proteinacious ligands. However, certain CLR families within the NKC, particularly those expressed by myeloid cells, recognize structurally diverse ligands and perform a variety of other immune and homoeostatic functions. One such family is the 'Dectin-1 cluster' of CLRs, which includes MICL, CLEC-2, CLEC12B, CLEC9A, CLEC-1, Dectin-1 and LOX-1. Here, we review each of these CLRs, exploring our current understanding of their ligands and functions and highlighting where they have provided new insights into the underlying mechanisms of immunity and homeostasis.
    Keywords homeostasis
    Language English
    Dates of publication 2009-01
    Size p. 121-128.
    Publisher Blackwell Publishing Ltd
    Publishing place Oxford, UK
    Document type Article
    ZDB-ID 752343-9
    ISSN 1574-6968 ; 0378-1097
    ISSN (online) 1574-6968
    ISSN 0378-1097
    DOI 10.1111/j.1574-6968.2008.01418.x
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: CLEC9A is a novel activation C-type lectin-like receptor expressed on BDCA3+ dendritic cells and a subset of monocytes.

    Huysamen, Cristal / Willment, Janet A / Dennehy, Kevin M / Brown, Gordon D

    The Journal of biological chemistry

    2008  Volume 283, Issue 24, Page(s) 16693–16701

    Abstract: We describe here the first characterization of CLEC9A, a group V C-type lectin-like receptor located in the "Dectin-1 cluster" of related receptors, which are encoded within the natural killer (NK)-gene complex. Expression of human CLEC9A is highly ... ...

    Abstract We describe here the first characterization of CLEC9A, a group V C-type lectin-like receptor located in the "Dectin-1 cluster" of related receptors, which are encoded within the natural killer (NK)-gene complex. Expression of human CLEC9A is highly restricted in peripheral blood, being detected only on BDCA3(+) dendritic cells and on a small subset of CD14(+)CD16(-) monocytes. CLEC9A is expressed at the cell surface as a glycosylated dimer and can mediate endocytosis, but not phagocytosis. CLEC9A possesses a cytoplasmic immunoreceptor tyrosine-based activation-like motif that can recruit Syk kinase, and we demonstrate, using receptor chimeras, that this receptor can induce proinflammatory cytokine production. These data indicate that CLEC9A functions as an activation receptor.
    MeSH term(s) Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Base Sequence ; Dendritic Cells/cytology ; Endocytosis ; Humans ; Intracellular Signaling Peptides and Proteins/metabolism ; Lectins, C-Type ; Lipopolysaccharide Receptors/biosynthesis ; Mice ; Models, Biological ; Molecular Sequence Data ; Monocytes/cytology ; Protein-Tyrosine Kinases/metabolism ; Receptors, IgG/biosynthesis ; Receptors, Mitogen/chemistry ; Receptors, Mitogen/metabolism ; Receptors, Mitogen/physiology ; Syk Kinase
    Chemical Substances CLEC9a protein, human ; Intracellular Signaling Peptides and Proteins ; Lectins, C-Type ; Lipopolysaccharide Receptors ; Receptors, IgG ; Receptors, Mitogen ; Protein-Tyrosine Kinases (EC 2.7.10.1) ; SYK protein, human (EC 2.7.10.2) ; Syk Kinase (EC 2.7.10.2) ; Syk protein, mouse (EC 2.7.10.2)
    Language English
    Publishing date 2008-04-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M709923200
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Assessing the DNA methylation status of single cells with the comet assay.

    Wentzel, Johannes F / Gouws, Chrisna / Huysamen, Cristal / Dyk, Etresia van / Koekemoer, Gerhard / Pretorius, Pieter J

    Analytical biochemistry

    2010  Volume 400, Issue 2, Page(s) 190–194

    Abstract: The comet assay (single cell gel electrophoresis) is a cost-effective, sensitive, and simple technique that is traditionally used for analyzing and quantifying DNA damage in individual cells. The aim of this study was to determine whether the comet assay ...

    Abstract The comet assay (single cell gel electrophoresis) is a cost-effective, sensitive, and simple technique that is traditionally used for analyzing and quantifying DNA damage in individual cells. The aim of this study was to determine whether the comet assay could be modified to detect changes in the levels of DNA methylation in single cells. We used the difference in methylation sensitivity of the isoschizomeric restriction endonucleases HpaII and MspI to demonstrate the feasibility of the comet assay to measure the global DNA methylation level of individual cells. The results were verified with the well-established cytosine extension assay. We were able to show variations in DNA methylation after treatment of cultured cells with 5-azacytidine and succinylacetone, an accumulating metabolite in human tyrosinemia type I.
    MeSH term(s) Azacitidine/chemistry ; Azacitidine/pharmacology ; Comet Assay/methods ; Cytosine/metabolism ; DNA Methylation ; DNA-Cytosine Methylases/metabolism ; Deoxyribonuclease HpaII/metabolism ; Hep G2 Cells ; Heptanoates/chemistry ; Heptanoates/pharmacology ; Humans ; Tyrosinemias/metabolism
    Chemical Substances Heptanoates ; succinylacetone (51568-18-4) ; Cytosine (8J337D1HZY) ; DNA modification methylase HpaII (EC 2.1.1.-) ; DNA-Cytosine Methylases (EC 2.1.1.-) ; Deoxyribonuclease HpaII (EC 3.1.21.-) ; Azacitidine (M801H13NRU)
    Language English
    Publishing date 2010-05-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1110-1
    ISSN 1096-0309 ; 0003-2697
    ISSN (online) 1096-0309
    ISSN 0003-2697
    DOI 10.1016/j.ab.2010.02.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: CLEC9A Is a Novel Activation C-type Lectin-like Receptor Expressed on BDCA3⁺ Dendritic Cells and a Subset of Monocytes

    Huysamen, Cristal / Willment, Janet A / Dennehy, Kevin M / Brown, Gordon D

    Journal of biological chemistry. 2008 June 13, v. 283, no. 24

    2008  

    Abstract: We describe here the first characterization of CLEC9A, a group V C-type lectin-like receptor located in the "Dectin-1 cluster" of related receptors, which are encoded within the natural killer (NK)-gene complex. Expression of human CLEC9A is highly ... ...

    Abstract We describe here the first characterization of CLEC9A, a group V C-type lectin-like receptor located in the "Dectin-1 cluster" of related receptors, which are encoded within the natural killer (NK)-gene complex. Expression of human CLEC9A is highly restricted in peripheral blood, being detected only on BDCA3⁺ dendritic cells and on a small subset of CD14⁺CD16⁻ monocytes. CLEC9A is expressed at the cell surface as a glycosylated dimer and can mediate endocytosis, but not phagocytosis. CLEC9A possesses a cytoplasmic immunoreceptor tyrosine-based activation-like motif that can recruit Syk kinase, and we demonstrate, using receptor chimeras, that this receptor can induce proinflammatory cytokine production. These data indicate that CLEC9A functions as an activation receptor.
    Language English
    Dates of publication 2008-0613
    Size p. 16693-16701.
    Publishing place American Society for Biochemistry and Molecular Biology
    Document type Article
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Characterisation of murine MICL (CLEC12A) and evidence for an endogenous ligand.

    Pyz, Elwira / Huysamen, Cristal / Marshall, Andrew S J / Gordon, Siamon / Taylor, Philip R / Brown, Gordon D

    European journal of immunology

    2008  Volume 38, Issue 4, Page(s) 1157–1163

    Abstract: Inhibitory receptors are required for the control of cellular activation and they play essential roles in regulating homeostasis and immunity. We previously identified a human inhibitory C-type lectin-like receptor, MICL (CLEC12A), a heavily glycosylated ...

    Abstract Inhibitory receptors are required for the control of cellular activation and they play essential roles in regulating homeostasis and immunity. We previously identified a human inhibitory C-type lectin-like receptor, MICL (CLEC12A), a heavily glycosylated monomer predominantly expressed on myeloid cells. Here we characterise the murine homolog of MICL (mMICL), and demonstrate that the receptor is structurally and functionally similar to the human orthologue (hMICL), although there are some notable differences. mMICL is expressed as a dimer and is not heavily glycosylated; however, like hMICL, the receptor can recruit inhibitory phosphatases upon activation, and is down-regulated on leukocytes following stimulation with selected TLR agonists. Using novel monoclonal antibodies, we demonstrate that, like the human receptor, mMICL is predominantly expressed by myeloid cells. However, mMICL is also expressed by B cells and CD8+ T cells in peripheral blood, and NK cells in the bone marrow. Finally, we show that mMICL recognises an endogenous ligand in a variety of murine tissues, suggesting that the receptor plays a role in homeostasis.
    MeSH term(s) Amino Acid Sequence ; Animals ; Humans ; Lectins, C-Type/chemistry ; Lectins, C-Type/genetics ; Lectins, C-Type/metabolism ; Ligands ; Mice ; Molecular Sequence Data ; Rats ; Receptors, Mitogen/chemistry ; Receptors, Mitogen/genetics ; Receptors, Mitogen/metabolism ; Sequence Alignment ; Sequence Homology, Amino Acid
    Chemical Substances CLEC12A protein, mouse ; Lectins, C-Type ; Ligands ; Receptors, Mitogen
    Language English
    Publishing date 2008-03-19
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120108-6
    ISSN 1521-4141 ; 0014-2980
    ISSN (online) 1521-4141
    ISSN 0014-2980
    DOI 10.1002/eji.200738057
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Characterisation of murine MICL (CLEC12A) and evidence for an endogenous ligand

    Pyż, Elwira / Huysamen, Cristal / Marshall, Andrew S.J / Gordon, Siamon / Taylor, Philip R / Brown, Gordon D

    European journal of immunology. 2008 Apr., v. 38, no. 4

    2008  

    Abstract: Inhibitory receptors are required for the control of cellular activation and they play essential roles in regulating homeostasis and immunity. We previously identified a human inhibitory C-type lectin-like receptor, MICL (CLEC12A), a heavily glycosylated ...

    Abstract Inhibitory receptors are required for the control of cellular activation and they play essential roles in regulating homeostasis and immunity. We previously identified a human inhibitory C-type lectin-like receptor, MICL (CLEC12A), a heavily glycosylated monomer predominantly expressed on myeloid cells. Here we characterise the murine homolog of MICL (mMICL), and demonstrate that the receptor is structurally and functionally similar to the human orthologue (hMICL), although there are some notable differences. mMICL is expressed as a dimer and is not heavily glycosylated; however, like hMICL, the receptor can recruit inhibitory phosphatases upon activation, and is down-regulated on leukocytes following stimulation with selected TLR agonists. Using novel monoclonal antibodies, we demonstrate that, like the human receptor, mMICL is predominantly expressed by myeloid cells. However, mMICL is also expressed by B cells and CD8⁺ T cells in peripheral blood, and NK cells in the bone marrow. Finally, we show that mMICL recognises an endogenous ligand in a variety of murine tissues, suggesting that the receptor plays a role in homeostasis.
    Language English
    Dates of publication 2008-04
    Size p. 1157-1163.
    Publishing place Wiley-VCH Verlag
    Document type Article
    ZDB-ID 120108-6
    ISSN 1521-4141 ; 0014-2980
    ISSN (online) 1521-4141
    ISSN 0014-2980
    DOI 10.1002/eji.200738057
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: In vitro antioxidant, antimutagenic and genoprotective activity of Rosa roxburghii fruit extract.

    van der Westhuizen, Francois H / van Rensburg, Catharina S Janse / Rautenbach, George S / Marnewick, Jeanine L / Loots, Du Toit / Huysamen, Cristal / Louw, Roan / Pretorius, Pieter J / Erasmus, Elardus

    Phytotherapy research : PTR

    2008  Volume 22, Issue 3, Page(s) 376–383

    Abstract: The antioxidant properties of the fruit of the Rosa roxburghii (RR) plant have been associated with several putative health promoting effects. The possible cytotoxic, mutagenic/antimutagenic and genotoxic effects of RR fruit extract were investigated. ... ...

    Abstract The antioxidant properties of the fruit of the Rosa roxburghii (RR) plant have been associated with several putative health promoting effects. The possible cytotoxic, mutagenic/antimutagenic and genotoxic effects of RR fruit extract were investigated. The effect on antioxidant status and protection against induced oxidative stress were also investigated using primary rat hepatocytes. A RR fruit extract containing 45 g/L total ascorbic acid and 65 g/L total polyphenols was used in this study. Dilutions up to 0.08% (v/v) increased significantly the antioxidant status in primary rat hepatocytes. The glutathione redox state was decreased with RR treatment but was increased in Chang liver cells and MT-2 lymphoblast. No cyto- or genotoxicity were observed at levels of up to 5% (v/v) of the fruit extract. In addition, a significant protection against t-BHP induced oxidative stress was observed in primary rat hepatocytes. The Ames test revealed no mutagenic activity using the Salmonella typhimurium strains TA98, TA100 and TA102. A significant antimutagenic effect of the extract was observed against the metabolic activated mutagens 2-acetylaminofluorene and aflatoxin B1 and to a lesser extent against methyl methanesulfonate. It is concluded that these results support the associated health promoting potential of Rosa Roxburghii fruit and in particular against oxidative stress.
    MeSH term(s) Animals ; Antimutagenic Agents/pharmacology ; Antioxidants/pharmacology ; Carcinogens/pharmacology ; Cells, Cultured ; Comet Assay ; DNA Damage/drug effects ; Fruit/chemistry ; Glutathione/analysis ; Glutathione/drug effects ; Hepatocytes/cytology ; Hepatocytes/drug effects ; Male ; Oxidation-Reduction/drug effects ; Oxidative Stress/drug effects ; Plant Extracts/pharmacology ; Plant Extracts/toxicity ; Rats ; Rats, Sprague-Dawley ; Rosa/chemistry ; Salmonella typhimurium/drug effects ; tert-Butylhydroperoxide/pharmacology
    Chemical Substances Antimutagenic Agents ; Antioxidants ; Carcinogens ; Plant Extracts ; tert-Butylhydroperoxide (955VYL842B) ; Glutathione (GAN16C9B8O)
    Language English
    Publishing date 2008-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 639136-9
    ISSN 1099-1573 ; 0951-418X
    ISSN (online) 1099-1573
    ISSN 0951-418X
    DOI 10.1002/ptr.2330
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: In vitro antioxidant, antimutagenic and genoprotective activity of Rosa roxburghii fruit extract

    van der Westhuizen, Francois H / van Rensburg, Catharina S. Janse / Rautenbach, George S / Marnewick, Jeanine L / Loots, Du Toit / Huysamen, Cristal / Louw, Roan / Pretorius, Pieter J / Erasmus, Elardus

    Phytotherapy research. 2008 Mar., v. 22, no. 3

    2008  

    Abstract: The antioxidant properties of the fruit of the Rosa roxburghii (RR) plant have been associated with several putative health promoting effects. The possible cytotoxic, mutagenic/antimutagenic and genotoxic effects of RR fruit extract were investigated. ... ...

    Abstract The antioxidant properties of the fruit of the Rosa roxburghii (RR) plant have been associated with several putative health promoting effects. The possible cytotoxic, mutagenic/antimutagenic and genotoxic effects of RR fruit extract were investigated. The effect on antioxidant status and protection against induced oxidative stress were also investigated using primary rat hepatocytes. A RR fruit extract containing 45 g/L total ascorbic acid and 65 g/L total polyphenols was used in this study. Dilutions up to 0.08% (v/v) increased significantly the antioxidant status in primary rat hepatocytes. The glutathione redox state was decreased with RR treatment but was increased in Chang liver cells and MT-2 lymphoblast. No cyto- or genotoxicity were observed at levels of up to 5% (v/v) of the fruit extract. In addition, a significant protection against t-BHP induced oxidative stress was observed in primary rat hepatocytes. The Ames test revealed no mutagenic activity using the Salmonella typhimurium strains TA98, TA100 and TA102. A significant antimutagenic effect of the extract was observed against the metabolic activated mutagens 2-acetylaminofluorene and aflatoxin B1 and to a lesser extent against methyl methanesulfonate. It is concluded that these results support the associated health promoting potential of Rosa Roxburghii fruit and in particular against oxidative stress. Copyright © 2007 John Wiley & Sons, Ltd.
    Keywords Ames test ; Rosa ; Salmonella typhimurium ; aflatoxin B1 ; antimutagenic activity ; antioxidant activity ; antioxidants ; ascorbic acid ; cytotoxicity ; fruit extracts ; fruits ; genotoxicity ; hepatocytes ; methyl methanesulfonate ; mutagenicity ; oxidative stress ; polyphenols ; rats
    Language English
    Dates of publication 2008-03
    Size p. 376-383.
    Publishing place John Wiley & Sons, Ltd.
    Document type Article
    ZDB-ID 639136-9
    ISSN 1099-1573 ; 0951-418X
    ISSN (online) 1099-1573
    ISSN 0951-418X
    DOI 10.1002/ptr.2330
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  10. Article ; Online: Human dectin-1 deficiency and mucocutaneous fungal infections.

    Ferwerda, Bart / Ferwerda, Gerben / Plantinga, Theo S / Willment, Janet A / van Spriel, Annemiek B / Venselaar, Hanka / Elbers, Clara C / Johnson, Melissa D / Cambi, Alessandra / Huysamen, Cristal / Jacobs, Liesbeth / Jansen, Trees / Verheijen, Karlijn / Masthoff, Laury / Morré, Servaas A / Vriend, Gert / Williams, David L / Perfect, John R / Joosten, Leo A B /
    Wijmenga, Cisca / van der Meer, Jos W M / Adema, Gosse J / Kullberg, Bart Jan / Brown, Gordon D / Netea, Mihai G

    The New England journal of medicine

    2011  Volume 361, Issue 18, Page(s) 1760–1767

    Abstract: Mucocutaneous fungal infections are typically found in patients who have no known immune defects. We describe a family in which four women who were affected by either recurrent vulvovaginal candidiasis or onychomycosis had the early-stop-codon mutation ... ...

    Abstract Mucocutaneous fungal infections are typically found in patients who have no known immune defects. We describe a family in which four women who were affected by either recurrent vulvovaginal candidiasis or onychomycosis had the early-stop-codon mutation Tyr238X in the beta-glucan receptor dectin-1. The mutated form of dectin-1 was poorly expressed, did not mediate beta-glucan binding, and led to defective production of cytokines (interleukin-17, tumor necrosis factor, and interleukin-6) after stimulation with beta-glucan or Candida albicans. In contrast, fungal phagocytosis and fungal killing were normal in the patients, explaining why dectin-1 deficiency was not associated with invasive fungal infections and highlighting the specific role of dectin-1 in human mucosal antifungal defense.
    MeSH term(s) Animals ; Candida albicans/immunology ; Candidiasis/genetics ; Candidiasis/immunology ; Candidiasis, Chronic Mucocutaneous/genetics ; Candidiasis, Vulvovaginal/genetics ; Codon, Nonsense ; Cytokines/biosynthesis ; Female ; Genetic Predisposition to Disease ; Humans ; Lectins, C-Type ; Male ; Mammals/genetics ; Membrane Proteins/deficiency ; Membrane Proteins/genetics ; Membrane Proteins/immunology ; Nerve Tissue Proteins/deficiency ; Nerve Tissue Proteins/genetics ; Nerve Tissue Proteins/immunology ; Onychomycosis/genetics ; Pedigree
    Chemical Substances Codon, Nonsense ; Cytokines ; Lectins, C-Type ; Membrane Proteins ; Nerve Tissue Proteins ; dectin 1
    Language English
    Publishing date 2011-09-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 207154-x
    ISSN 1533-4406 ; 0028-4793
    ISSN (online) 1533-4406
    ISSN 0028-4793
    DOI 10.1056/NEJMoa0901053
    Database MEDical Literature Analysis and Retrieval System OnLINE

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