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  1. Article ; Online: CXCR4+ Treg cells control serum IgM levels and natural IgM autoantibody production by B-1 cells in the bone marrow.

    Elias, Shlomo / Sharma, Rahul / Schizas, Michael / Valdez, Izabella / Rampersaud, Sham / Park, Sun-Mi / Gonzalez-Figueroa, Paula / Li, Quan-Zhen / Hoyos, Beatrice / Rudensky, Alexander Y

    The Journal of experimental medicine

    2022  Volume 219, Issue 7

    Abstract: Regulatory T (Treg) cells represent a specialized lineage of suppressive CD4+ T cells whose functionality is critically dependent on their ability to migrate to and dwell in the proximity of cells they control. Here we show that continuous expression of ... ...

    Abstract Regulatory T (Treg) cells represent a specialized lineage of suppressive CD4+ T cells whose functionality is critically dependent on their ability to migrate to and dwell in the proximity of cells they control. Here we show that continuous expression of the chemokine receptor CXCR4 in Treg cells is required for their ability to accumulate in the bone marrow (BM). Induced CXCR4 ablation in Treg cells led to their rapid depletion and consequent increase in mature B cells, foremost the B-1 subset, observed exclusively in the BM without detectable changes in plasma cells or hematopoietic stem cells or any signs of systemic or local immune activation elsewhere. Dysregulation of BM B-1 B cells was associated with a highly specific increase in IgM autoantibodies and total serum IgM levels. Thus, Treg cells control autoreactive B-1 B cells in a CXCR4-dependent manner. These findings have significant implications for understanding the regulation of B cell autoreactivity and malignancies.
    MeSH term(s) B-Lymphocyte Subsets/metabolism ; Bone Marrow/metabolism ; Bone Marrow Cells/metabolism ; Immunoglobulin M/metabolism ; Receptors, CXCR4/metabolism ; T-Lymphocytes, Regulatory
    Chemical Substances Immunoglobulin M ; Receptors, CXCR4
    Language English
    Publishing date 2022-06-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218343-2
    ISSN 1540-9538 ; 0022-1007
    ISSN (online) 1540-9538
    ISSN 0022-1007
    DOI 10.1084/jem.20220047
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Assembly of a spatial circuit of T-bet-expressing T and B lymphocytes is required for antiviral humoral immunity.

    Mendoza, Alejandra / Yewdell, William T / Hoyos, Beatrice / Schizas, Michail / Bou-Puerto, Regina / Michaels, Anthony J / Brown, Chrysothemis C / Chaudhuri, Jayanta / Rudensky, Alexander Y

    Science immunology

    2021  Volume 6, Issue 60

    Abstract: Effective antiviral immunity requires generation of T and B lymphocytes expressing the transcription factor T-bet, a regulator of type 1 inflammatory responses. Using T-bet expression as an endogenous marker for cells participating in a type 1 response, ... ...

    Abstract Effective antiviral immunity requires generation of T and B lymphocytes expressing the transcription factor T-bet, a regulator of type 1 inflammatory responses. Using T-bet expression as an endogenous marker for cells participating in a type 1 response, we report coordinated interactions of T-bet-expressing T and B lymphocytes on the basis of their dynamic colocalization at the T cell zone and B follicle boundary (T-B boundary) and germinal centers (GCs) during lung influenza infection. We demonstrate that the assembly of this circuit takes place in distinct anatomical niches within the draining lymph node, guided by CXCR3 that enables positioning of T
    MeSH term(s) Animals ; B-Lymphocytes/immunology ; B-Lymphocytes/metabolism ; Cell Communication/immunology ; Disease Models, Animal ; Female ; Germinal Center/cytology ; Germinal Center/metabolism ; Humans ; Immunity, Humoral ; Immunoglobulin Class Switching ; Influenza A virus/immunology ; Influenza, Human/immunology ; Influenza, Human/pathology ; Influenza, Human/virology ; Interferon-gamma/genetics ; Interferon-gamma/metabolism ; Lung/immunology ; Lung/pathology ; Lung/virology ; Male ; Mice ; Mice, Transgenic ; Nippostrongylus/immunology ; Rats ; Receptors, CXCR3/metabolism ; Strongylida Infections/immunology ; Strongylida Infections/parasitology ; T-Box Domain Proteins/genetics ; T-Box Domain Proteins/metabolism ; T-Lymphocyte Subsets/immunology ; T-Lymphocyte Subsets/metabolism ; Th1 Cells/immunology ; Th1 Cells/metabolism
    Chemical Substances Cxcr3 protein, mouse ; IFNG protein, mouse ; Receptors, CXCR3 ; T-Box Domain Proteins ; T-box transcription factor TBX21 ; Interferon-gamma (82115-62-6)
    Language English
    Publishing date 2021-06-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ISSN 2470-9468
    ISSN (online) 2470-9468
    DOI 10.1126/sciimmunol.abi4710
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  3. Article ; Online: A distal Foxp3 enhancer enables interleukin-2 dependent thymic Treg cell lineage commitment for robust immune tolerance.

    Dikiy, Stanislav / Li, Jun / Bai, Lu / Jiang, Menglin / Janke, Laura / Zong, Xinying / Hao, Xiaolei / Hoyos, Beatrice / Wang, Zhong-Min / Xu, Beisi / Fan, Yiping / Rudensky, Alexander Y / Feng, Yongqiang

    Immunity

    2021  Volume 54, Issue 5, Page(s) 931–946.e11

    Abstract: Activation of the STAT5 transcription factor downstream of the Interleukin-2 receptor (IL-2R) induces expression of Foxp3, a critical step in the differentiation of regulatory T (Treg) cells. Due to the pleiotropic effects of IL-2R signaling, it is ... ...

    Abstract Activation of the STAT5 transcription factor downstream of the Interleukin-2 receptor (IL-2R) induces expression of Foxp3, a critical step in the differentiation of regulatory T (Treg) cells. Due to the pleiotropic effects of IL-2R signaling, it is unclear how STAT5 acts directly on the Foxp3 locus to promote its expression. Here, we report that IL-2 - STAT5 signaling converged on an enhancer (CNS0) during Foxp3 induction. CNS0 facilitated the IL-2 dependent CD25
    MeSH term(s) Animals ; Autoimmunity/immunology ; Cell Differentiation/immunology ; Cell Lineage/immunology ; Enhancer Elements, Genetic/immunology ; Female ; Forkhead Transcription Factors/immunology ; Humans ; Immune Tolerance/immunology ; Interleukin-2/immunology ; Interleukin-2 Receptor alpha Subunit/immunology ; Male ; Mice ; Receptors, Interleukin-2/immunology ; STAT5 Transcription Factor/immunology ; Signal Transduction/immunology ; T-Lymphocytes, Regulatory/immunology
    Chemical Substances Forkhead Transcription Factors ; Foxp3 protein, mouse ; Interleukin-2 ; Interleukin-2 Receptor alpha Subunit ; Receptors, Interleukin-2 ; STAT5 Transcription Factor
    Language English
    Publishing date 2021-04-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1217235-2
    ISSN 1097-4180 ; 1074-7613
    ISSN (online) 1097-4180
    ISSN 1074-7613
    DOI 10.1016/j.immuni.2021.03.020
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  4. Article ; Online: Regulatory T cells function in established systemic inflammation and reverse fatal autoimmunity.

    Hu, Wei / Wang, Zhong-Min / Feng, Yongqiang / Schizas, Michail / Hoyos, Beatrice E / van der Veeken, Joris / Verter, Jacob G / Bou-Puerto, Regina / Rudensky, Alexander Y

    Nature immunology

    2021  Volume 22, Issue 9, Page(s) 1163–1174

    Abstract: The immunosuppressive function of regulatory T ( ... ...

    Abstract The immunosuppressive function of regulatory T (T
    MeSH term(s) Animals ; Autoimmune Diseases/immunology ; Autoimmunity/genetics ; Autoimmunity/immunology ; Cell Differentiation/immunology ; Female ; Forkhead Transcription Factors/genetics ; Forkhead Transcription Factors/metabolism ; Gene Expression Regulation/genetics ; Homeostasis/immunology ; Inflammation Mediators/metabolism ; Lymphocyte Activation/immunology ; Male ; Mice ; Mice, Inbred C57BL ; Systemic Inflammatory Response Syndrome/immunology ; Systemic Inflammatory Response Syndrome/pathology ; T-Lymphocytes, Regulatory/immunology
    Chemical Substances Forkhead Transcription Factors ; Foxp3 protein, mouse ; Inflammation Mediators
    Language English
    Publishing date 2021-08-23
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2016987-5
    ISSN 1529-2916 ; 1529-2908
    ISSN (online) 1529-2916
    ISSN 1529-2908
    DOI 10.1038/s41590-021-01001-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Retinol as a cofactor for PKCδ-mediated impairment of insulin sensitivity in a mouse model of diet-induced obesity.

    Shabrova, Elena / Hoyos, Beatrice / Vinogradov, Valerie / Kim, Youn-Kyung / Wassef, Lesley / Leitges, Michael / Quadro, Loredana / Hammerling, Ulrich

    FASEB journal : official publication of the Federation of American Societies for Experimental Biology

    2016  Volume 30, Issue 3, Page(s) 1339–1355

    Abstract: We previously defined that the mitochondria-localized PKCδ signaling complex stimulates the conversion of pyruvate to acetyl-coenzyme A by the pyruvate dehydrogenase complex. We demonstrated in vitro and ex vivo that retinol supplementation enhances ATP ... ...

    Abstract We previously defined that the mitochondria-localized PKCδ signaling complex stimulates the conversion of pyruvate to acetyl-coenzyme A by the pyruvate dehydrogenase complex. We demonstrated in vitro and ex vivo that retinol supplementation enhances ATP synthesis in the presence of the PKCδ signalosome. Here, we tested in vivo if a persistent oversupply of retinol would further impair glucose metabolism in a mouse model of diet-induced insulin resistance. We crossed mice overexpressing human retinol-binding protein (hRBP) under the muscle creatine kinase (MCK) promoter (MCKhRBP) with the PKCδ(-/-) strain to generate mice with a different status of the PKCδ signalosome and retinoid levels. Mice with a functional PKCδ signalosome and elevated retinoid levels (PKCδ(+/+)hRBP) developed the most advanced stage of insulin resistance. In contrast, elevation of retinoid levels in mice with inactive PKCδ did not affect remarkably their metabolism, resulting in phenotypic similarity between PKCδ(-/-)hRBP and PKCδ(-/-) mice. Therefore, in addition to the well-defined role of PKCδ in the etiology of metabolic syndrome, we present a novel PKCδ signaling pathway that requires retinol as a metabolic cofactor and is involved in the regulation of fuel utilization in mitochondria. The distinct role in whole-body energy homeostasis establishes the PKCδ signalosome as a promising target for therapeutic intervention in metabolic disorders.
    MeSH term(s) Animals ; Diet/adverse effects ; Disease Models, Animal ; Glucose/metabolism ; Homeostasis/physiology ; Humans ; Insulin Resistance/physiology ; Male ; Metabolic Syndrome/metabolism ; Mice ; Mice, Inbred C57BL ; Mitochondria/metabolism ; Obesity/metabolism ; Promoter Regions, Genetic/physiology ; Protein Kinase C-delta/metabolism ; Pyruvate Dehydrogenase Complex/metabolism ; Retinoids/metabolism ; Retinol-Binding Proteins/metabolism ; Signal Transduction/physiology ; Vitamin A/metabolism
    Chemical Substances Pyruvate Dehydrogenase Complex ; Retinoids ; Retinol-Binding Proteins ; Vitamin A (11103-57-4) ; Prkcd protein, mouse (EC 2.7.1.-) ; Protein Kinase C-delta (EC 2.7.11.13) ; Glucose (IY9XDZ35W2)
    Language English
    Publishing date 2016-03
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 639186-2
    ISSN 1530-6860 ; 0892-6638
    ISSN (online) 1530-6860
    ISSN 0892-6638
    DOI 10.1096/fj.15-281543
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  6. Article ; Online: β-apo-10'-carotenoids support normal embryonic development during vitamin A deficiency.

    Spiegler, Elizabeth / Kim, Youn-Kyung / Hoyos, Beatrice / Narayanasamy, Sureshbabu / Jiang, Hongfeng / Savio, Nicole / Curley, Robert W / Harrison, Earl H / Hammerling, Ulrich / Quadro, Loredana

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 8834

    Abstract: Vitamin A deficiency is still a public health concern affecting millions of pregnant women and children. Retinoic acid, the active form of vitamin A, is critical for proper mammalian embryonic development. Embryos can generate retinoic acid from maternal ...

    Abstract Vitamin A deficiency is still a public health concern affecting millions of pregnant women and children. Retinoic acid, the active form of vitamin A, is critical for proper mammalian embryonic development. Embryos can generate retinoic acid from maternal circulating β-carotene upon oxidation of retinaldehyde produced via the symmetric cleavage enzyme β-carotene 15,15'-oxygenase (BCO1). Another cleavage enzyme, β-carotene 9',10'-oxygenase (BCO2), asymmetrically cleaves β-carotene in adult tissues to prevent its mitochondrial toxicity, generating β-apo-10'-carotenal, which can be converted to retinoids (vitamin A and its metabolites) by BCO1. However, the role of BCO2 during mammalian embryogenesis is unknown. We found that mice lacking BCO2 on a vitamin A deficiency-susceptible genetic background (Rbp4
    MeSH term(s) Animals ; Carotenoids/metabolism ; Dioxygenases/deficiency ; Dioxygenases/metabolism ; Embryonic Development ; Mice, Inbred C57BL ; Mice, Knockout ; Retinoids/metabolism ; Retinol-Binding Proteins, Plasma/deficiency ; Retinol-Binding Proteins, Plasma/metabolism ; Vitamin A Deficiency/complications ; Vitamin A Deficiency/physiopathology ; beta-Carotene 15,15'-Monooxygenase/deficiency ; beta-Carotene 15,15'-Monooxygenase/metabolism
    Chemical Substances Rbp4 protein, mouse ; Retinoids ; Retinol-Binding Proteins, Plasma ; beta-apo-10'-carotenal ; Carotenoids (36-88-4) ; Dioxygenases (EC 1.13.11.-) ; Bco1 protein, mouse (EC 1.13.11.63) ; Bco2 protein, mouse (EC 1.14.99.-) ; beta-Carotene 15,15'-Monooxygenase (EC 1.14.99.36)
    Language English
    Publishing date 2018-06-11
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-27071-3
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  7. Article ; Online: Extrathymically Generated Regulatory T Cells Establish a Niche for Intestinal Border-Dwelling Bacteria and Affect Physiologic Metabolite Balance.

    Campbell, Clarissa / Dikiy, Stanislav / Bhattarai, Shakti K / Chinen, Takatoshi / Matheis, Fanny / Calafiore, Marco / Hoyos, Beatrice / Hanash, Alan / Mucida, Daniel / Bucci, Vanni / Rudensky, Alexander Y

    Immunity

    2018  Volume 48, Issue 6, Page(s) 1245–1257.e9

    Abstract: The mammalian gut microbiota provides essential metabolites to the host and promotes the differentiation and accumulation of extrathymically generated regulatory T (pTreg) cells. To explore the impact of these cells on intestinal microbial communities, ... ...

    Abstract The mammalian gut microbiota provides essential metabolites to the host and promotes the differentiation and accumulation of extrathymically generated regulatory T (pTreg) cells. To explore the impact of these cells on intestinal microbial communities, we assessed the composition of the microbiota in pTreg cell-deficient and -sufficient mice. pTreg cell deficiency led to heightened type 2 immune responses triggered by microbial exposure, which disrupted the niche of border-dwelling bacteria early during colonization. Moreover, impaired pTreg cell generation led to pervasive changes in metabolite profiles, altered features of the intestinal epithelium, and reduced body weight in the presence of commensal microbes. Absence of a single species of bacteria depleted in pTreg cell-deficient animals, Mucispirillum schaedleri, partially accounted for the sequelae of pTreg cell deficiency. These observations suggest that pTreg cells modulate the metabolic function of the intestinal microbiota by restraining immune defense mechanisms that may disrupt a particular bacterial niche.
    MeSH term(s) Animals ; Gastrointestinal Microbiome/immunology ; Host Microbial Interactions/immunology ; Immunity, Mucosal/immunology ; Intestinal Mucosa/immunology ; Mice ; T-Lymphocytes, Regulatory/immunology
    Language English
    Publishing date 2018-05-29
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1217235-2
    ISSN 1097-4180 ; 1074-7613
    ISSN (online) 1097-4180
    ISSN 1074-7613
    DOI 10.1016/j.immuni.2018.04.013
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  8. Article: Hiding in plain sight: uncovering a new function of vitamin A in redox signaling.

    Hoyos, Beatrice / Acin-Perez, Rebeca / Fischman, Donald A / Manfredi, Giovanni / Hammerling, Ulrich

    Biochimica et biophysica acta

    2011  Volume 1821, Issue 1, Page(s) 241–247

    Abstract: The protein kinase Cδ signalosome modulates the generation of acetyl-Coenzyme A from glycolytic sources. This module is composed of four interlinked components: PKCδ, the signal adapter p66Shc, cytochrome c, and vitamin A. It resides in the intermembrane ...

    Abstract The protein kinase Cδ signalosome modulates the generation of acetyl-Coenzyme A from glycolytic sources. This module is composed of four interlinked components: PKCδ, the signal adapter p66Shc, cytochrome c, and vitamin A. It resides in the intermembrane space of mitochondria, and is at the center of a feedback loop that senses upstream the redox balance between oxidized and reduced cytochrome c as a measure of the workload of the respiratory chain, and transmits a forward signal to the pyruvate dehydrogenase complex to adjust the flux of fuel entering the tricarboxylic acid cycle. The novel role of vitamin A as co-activator and potential electron carrier, required for redox activation of PKCδ, is discussed. This article is part of a Special Issue entitled Retinoid and Lipid Metabolism.
    MeSH term(s) Acetyl Coenzyme A/metabolism ; Animals ; Citric Acid Cycle/physiology ; Cytochromes c/metabolism ; Electron Transport/physiology ; Humans ; Mitochondria/metabolism ; Oxidation-Reduction ; Oxidative Phosphorylation ; Protein Kinase C-delta/metabolism ; Pyruvate Dehydrogenase Complex/metabolism ; Signal Transduction ; Vitamin A/analogs & derivatives ; Vitamin A/metabolism
    Chemical Substances Pyruvate Dehydrogenase Complex ; Vitamin A (11103-57-4) ; anhydrovitamin A (235BBF3K97) ; Acetyl Coenzyme A (72-89-9) ; Cytochromes c (9007-43-6) ; Protein Kinase C-delta (EC 2.7.11.13)
    Language English
    Publishing date 2011-06-25
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 60-7
    ISSN 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbalip.2011.06.014
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  9. Article ; Online: Corrigendum: Stability and function of regulatory T cells expressing the transcription factor T-bet.

    Levine, Andrew G / Mendoza, Alejandra / Hemmers, Saskia / Moltedo, Bruno / Niec, Rachel E / Schizas, Michail / Hoyos, Beatrice E / Putintseva, Ekaterina V / Chaudhry, Ashutosh / Dikiy, Stanislav / Fujisawa, Sho / Chudakov, Dmitriy M / Treuting, Piper M / Rudensky, Alexander Y

    Nature

    2017  Volume 550, Issue 7674, Page(s) 142

    Abstract: This corrects the article DOI: 10.1038/nature22360. ...

    Abstract This corrects the article DOI: 10.1038/nature22360.
    Language English
    Publishing date 2017-09-29
    Publishing country England
    Document type Journal Article ; Published Erratum
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/nature24013
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  10. Article ; Online: Stability and function of regulatory T cells expressing the transcription factor T-bet.

    Levine, Andrew G / Mendoza, Alejandra / Hemmers, Saskia / Moltedo, Bruno / Niec, Rachel E / Schizas, Michail / Hoyos, Beatrice E / Putintseva, Ekaterina V / Chaudhry, Ashutosh / Dikiy, Stanislav / Fujisawa, Sho / Chudakov, Dmitriy M / Treuting, Piper M / Rudensky, Alexander Y

    Nature

    2017  Volume 546, Issue 7658, Page(s) 421–425

    Abstract: Adaptive immune responses are tailored to different types of pathogens through differentiation of naive CD4 T cells into functionally distinct subsets of effector T cells (T helper 1 ( ... ...

    Abstract Adaptive immune responses are tailored to different types of pathogens through differentiation of naive CD4 T cells into functionally distinct subsets of effector T cells (T helper 1 (T
    MeSH term(s) Animals ; Autoimmunity/immunology ; CD8-Positive T-Lymphocytes/cytology ; CD8-Positive T-Lymphocytes/immunology ; Cell Separation ; Female ; Immune Tolerance/immunology ; Lymphocyte Activation ; Male ; Mice ; T-Box Domain Proteins/metabolism ; T-Lymphocytes, Regulatory/cytology ; T-Lymphocytes, Regulatory/immunology ; T-Lymphocytes, Regulatory/metabolism ; Th1 Cells/cytology ; Th1 Cells/immunology ; Th17 Cells/cytology ; Th17 Cells/immunology ; Th2 Cells/cytology ; Th2 Cells/immunology
    Chemical Substances T-Box Domain Proteins ; T-box transcription factor TBX21
    Language English
    Publishing date 2017-06-07
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/nature22360
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