Stepwise Development of MAIT Cells in Mouse and Human
- Publication Date
- March 10, 2009
- Journal
- PLOS Biology
- Authors
- Emmanuel Martin, Emmanuel Treiner, Livine Duban, Lucia Guerri, et al
- Volume
- 7
- Issue
- 3
- Pages
- e1000054
- DOI
- https://dx.plos.org/10.1371/journal.pbio.1000054
- Publisher URL
- http://journals.plos.org/plosbiology/article?id=10.1371%2Fjournal.pbio.1000054
- PubMed
- http://www.ncbi.nlm.nih.gov/pubmed/19278296
- PubMed Central
- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2653554
- Europe PMC
- http://europepmc.org/abstract/MED/19278296
- Web of Science
- 000265412600011
- Mendeley
- http://www.mendeley.com/research/stepwise-development-mait-cells-mouse-human-thymic-development-mait-cells
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Mendeley | Further Information
{"title"=>"Stepwise Development of MAIT Cells in Mouse and Human (Thymic Development of MAIT Cells)", "type"=>"journal", "authors"=>[{"first_name"=>"Emmanuel", "last_name"=>"Martin"}, {"first_name"=>"Emmanuel", "last_name"=>"Treiner"}, {"first_name"=>"Livine", "last_name"=>"Duban"}, {"first_name"=>"Lucia", "last_name"=>"Guerri"}, {"first_name"=>"H�l�ne", "last_name"=>"Laude"}, {"first_name"=>"C�cile", "last_name"=>"Toly"}, {"first_name"=>"Virginie", "last_name"=>"Premel"}, {"first_name"=>"Anne", "last_name"=>"Devys"}, {"first_name"=>"Ivan C", "last_name"=>"Moura"}, {"first_name"=>"Florence", "last_name"=>"Tilloy"}, {"first_name"=>"St�phane", "last_name"=>"Cherif"}, {"first_name"=>"Gabriella", "last_name"=>"Vera"}, {"first_name"=>"Sylvain", "last_name"=>"Latour"}, {"first_name"=>"Claire", "last_name"=>"Soudais"}, {"first_name"=>"Olivier", "last_name"=>"Lantz"}], "year"=>2009, "source"=>"PLoS Biology", "identifiers"=>{"isbn"=>"1544-9173", "doi"=>"10.1371/journal.pbio.1000054"}, "id"=>"1f56c14d-0b70-38f2-907a-ce784d0fd397", "abstract"=>"Mucosal-associated invariant T (MAIT) cells display two evolutionarily conserved features: an invariant T cell receptor (TCR)a (iTCRa) chain and restriction by the nonpolymorphic class Ib major histocompatibility complex (MHC) molecule, MHC-related molecule 1 (MR1). MR1 expression on thymus epithelial cells is not necessary for MAIT cell development but their accumulation in the gut requires MR1 expressing B cells and commensal flora. MAIT cell development is poorly known, as these cells have not been found in the thymus so far. Herein, complementary human and mouse experiments using an anti-humanVa7.2 antibody and MAIT cell-specific iTCRa and TCR� transgenic mice in different genetic backgrounds show that MAIT cell development is a stepwise process, with an intra-thymic selection followed by peripheral expansion. Mouse MAIT cells are selected in an MR1-dependent manner both in fetal thymic organ culture and in double iTCRa and TCR� transgenic RAG knockout mice. In the latter mice, MAIT cells do not expand in the periphery unless B cells are added back by adoptive transfer, showing that B cells are not required for the initial thymic selection step but for the peripheral accumulation. In humans, contrary to natural killer T (NKT) cells, MAIT cells display a na�ve phenotype in the thymus as well as in cord blood where they are in low numbers. After birth, MAIT cells acquire a memory phenotype and expand dramatically, up to 1%�4% of blood T cells. Finally, in contrast with NKT cells, human MAIT cell development is independent of the molecular adaptor SAP. Interestingly, mouse MAIT cells display a na�ve phenotype and do not express the ZBTB16 transcription factor, which, in contrast, is expressed by NKT cells and the memory human MAIT cells found in the periphery after birth. In conclusion, MAIT cells are selected by MR1 in the thymus on a non-B non-T hematopoietic cell, and acquire a memory phenotype and expand in the periphery in a process dependent both upon B cells and the bacterial flora. Thus, their development follows a unique pattern at the crossroad of NKT and ?d T cells. ; White blood cells, or lymphocytes, play an important role in defending the body from infection and disease. T lymphocytes come in many varieties with diverse functions. Mucosal-associated invariant T (MAIT) cells constitute a subset of unconventional T lymphocytes, characterized by their invariant T cell receptor (TCR)a chain and their requirement for the nonpolymorphic class Ib (MHC) molecule, MR1. MAIT cells are extremely abundant in human blood and mucosae. Contrary to mainstream T cells, their development requires B cells and commensal microbial flora. To shed light on the little-understood MAIT cells, we used new tools, including an antibody that we recently developed to detect human MAIT cells, and we were able to show that MAIT cell development is a stepwise process, with an intra-thymic selection followed by peripheral expansion. We show that thymic selection is MR1 dependent but requires neither B cells nor the commensal flora, which are both necessary for the expansion in the periphery. In contrast with the other evolutionarily conserved invariant subset, the natural killer T (NKT) cells, we found that MAIT cells exit the thymus as �na�ve� cells before becoming antigen-experienced memory cells and expanding in number to represent a significant 1%�4% of peripheral T cells in human blood. In mice, we found that MAIT cells remain na�ve and do not expand substantially. We conclude that MAIT cell development follows a unique scheme, where, unlike NKT cells, MAIT cell selection and expansion are uncoupled events that are mediated by distinct cell types in different compartments. ; Mucosal-associated invariant T cells, the most abundant invariant T cell subset in humans, arise via a distinct developmental pathway that represents a hybrid of that seen for NKT and ?d T cells, two other unconventional T cell subsets.", "link"=>"http://www.mendeley.com/research/stepwise-development-mait-cells-mouse-human-thymic-development-mait-cells", "reader_count"=>1, "reader_count_by_academic_status"=>{"Student > Master"=>1}, "reader_count_by_user_role"=>{"Student > Master"=>1}, "reader_count_by_subject_area"=>{"Psychology"=>1}, "reader_count_by_subdiscipline"=>{"Psychology"=>{"Psychology"=>1}}, "group_count"=>1}CrossRef
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- {"month"=>"11", "year"=>"2009", "pdf_views"=>"5", "xml_views"=>"0", "html_views"=>"45"}
- {"month"=>"12", "year"=>"2009", "pdf_views"=>"11", "xml_views"=>"1", "html_views"=>"65"}
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- {"month"=>"2", "year"=>"2010", "pdf_views"=>"12", "xml_views"=>"0", "html_views"=>"94"}
- {"month"=>"3", "year"=>"2010", "pdf_views"=>"8", "xml_views"=>"1", "html_views"=>"95"}
- {"month"=>"4", "year"=>"2010", "pdf_views"=>"12", "xml_views"=>"1", "html_views"=>"38"}
- {"month"=>"5", "year"=>"2010", "pdf_views"=>"13", "xml_views"=>"0", "html_views"=>"41"}
- {"month"=>"6", "year"=>"2010", "pdf_views"=>"16", "xml_views"=>"0", "html_views"=>"54"}
- {"month"=>"7", "year"=>"2010", "pdf_views"=>"25", "xml_views"=>"1", "html_views"=>"69"}
- {"month"=>"8", "year"=>"2010", "pdf_views"=>"15", "xml_views"=>"1", "html_views"=>"51"}
- {"month"=>"9", "year"=>"2010", "pdf_views"=>"17", "xml_views"=>"1", "html_views"=>"63"}
- {"month"=>"10", "year"=>"2010", "pdf_views"=>"18", "xml_views"=>"1", "html_views"=>"57"}
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- {"month"=>"12", "year"=>"2010", "pdf_views"=>"14", "xml_views"=>"0", "html_views"=>"33"}
- {"month"=>"1", "year"=>"2011", "pdf_views"=>"17", "xml_views"=>"2", "html_views"=>"51"}
- {"month"=>"2", "year"=>"2011", "pdf_views"=>"10", "xml_views"=>"0", "html_views"=>"49"}
- {"month"=>"3", "year"=>"2011", "pdf_views"=>"22", "xml_views"=>"1", "html_views"=>"51"}
- {"month"=>"4", "year"=>"2011", "pdf_views"=>"16", "xml_views"=>"0", "html_views"=>"37"}
- {"month"=>"5", "year"=>"2011", "pdf_views"=>"17", "xml_views"=>"2", "html_views"=>"39"}
- {"month"=>"6", "year"=>"2011", "pdf_views"=>"12", "xml_views"=>"0", "html_views"=>"58"}
- {"month"=>"7", "year"=>"2011", "pdf_views"=>"11", "xml_views"=>"0", "html_views"=>"36"}
- {"month"=>"8", "year"=>"2011", "pdf_views"=>"14", "xml_views"=>"1", "html_views"=>"33"}
- {"month"=>"9", "year"=>"2011", "pdf_views"=>"22", "xml_views"=>"1", "html_views"=>"40"}
- {"month"=>"10", "year"=>"2011", "pdf_views"=>"16", "xml_views"=>"0", "html_views"=>"44"}
- {"month"=>"11", "year"=>"2011", "pdf_views"=>"26", "xml_views"=>"0", "html_views"=>"58"}
- {"month"=>"12", "year"=>"2011", "pdf_views"=>"15", "xml_views"=>"0", "html_views"=>"30"}
- {"month"=>"1", "year"=>"2012", "pdf_views"=>"17", "xml_views"=>"0", "html_views"=>"54"}
- {"month"=>"2", "year"=>"2012", "pdf_views"=>"11", "xml_views"=>"0", "html_views"=>"42"}
- {"month"=>"3", "year"=>"2012", "pdf_views"=>"20", "xml_views"=>"0", "html_views"=>"42"}
- {"month"=>"4", "year"=>"2012", "pdf_views"=>"22", "xml_views"=>"1", "html_views"=>"58"}
- {"month"=>"5", "year"=>"2012", "pdf_views"=>"16", "xml_views"=>"1", "html_views"=>"37"}
- {"month"=>"6", "year"=>"2012", "pdf_views"=>"16", "xml_views"=>"1", "html_views"=>"43"}
- {"month"=>"7", "year"=>"2012", "pdf_views"=>"18", "xml_views"=>"0", "html_views"=>"43"}
- {"month"=>"8", "year"=>"2012", "pdf_views"=>"16", "xml_views"=>"6", "html_views"=>"50"}
- {"month"=>"9", "year"=>"2012", "pdf_views"=>"11", "xml_views"=>"0", "html_views"=>"38"}
- {"month"=>"10", "year"=>"2012", "pdf_views"=>"14", "xml_views"=>"0", "html_views"=>"54"}
- {"month"=>"11", "year"=>"2012", "pdf_views"=>"23", "xml_views"=>"1", "html_views"=>"116"}
- {"month"=>"12", "year"=>"2012", "pdf_views"=>"21", "xml_views"=>"0", "html_views"=>"62"}
- {"month"=>"1", "year"=>"2013", "pdf_views"=>"18", "xml_views"=>"1", "html_views"=>"83"}
- {"month"=>"2", "year"=>"2013", "pdf_views"=>"25", "xml_views"=>"2", "html_views"=>"255"}
- {"month"=>"3", "year"=>"2013", "pdf_views"=>"18", "xml_views"=>"0", "html_views"=>"138"}
- {"month"=>"4", "year"=>"2013", "pdf_views"=>"24", "xml_views"=>"0", "html_views"=>"85"}
- {"month"=>"5", "year"=>"2013", "pdf_views"=>"19", "xml_views"=>"0", "html_views"=>"105"}
- {"month"=>"6", "year"=>"2013", "pdf_views"=>"14", "xml_views"=>"0", "html_views"=>"100"}
- {"month"=>"7", "year"=>"2013", "pdf_views"=>"19", "xml_views"=>"1", "html_views"=>"101"}
- {"month"=>"8", "year"=>"2013", "pdf_views"=>"11", "xml_views"=>"0", "html_views"=>"107"}
- {"month"=>"9", "year"=>"2013", "pdf_views"=>"9", "xml_views"=>"0", "html_views"=>"119"}
- {"month"=>"10", "year"=>"2013", "pdf_views"=>"19", "xml_views"=>"1", "html_views"=>"95"}
- {"month"=>"11", "year"=>"2013", "pdf_views"=>"30", "xml_views"=>"1", "html_views"=>"80"}
- {"month"=>"12", "year"=>"2013", "pdf_views"=>"17", "xml_views"=>"1", "html_views"=>"91"}
- {"month"=>"1", "year"=>"2014", "pdf_views"=>"46", "xml_views"=>"0", "html_views"=>"134"}
- {"month"=>"2", "year"=>"2014", "pdf_views"=>"23", "xml_views"=>"0", "html_views"=>"92"}
- {"month"=>"3", "year"=>"2014", "pdf_views"=>"11", "xml_views"=>"1", "html_views"=>"122"}
- {"month"=>"4", "year"=>"2014", "pdf_views"=>"21", "xml_views"=>"1", "html_views"=>"141"}
- {"month"=>"5", "year"=>"2014", "pdf_views"=>"33", "xml_views"=>"0", "html_views"=>"170"}
- {"month"=>"6", "year"=>"2014", "pdf_views"=>"26", "xml_views"=>"0", "html_views"=>"134"}
- {"month"=>"7", "year"=>"2014", "pdf_views"=>"27", "xml_views"=>"1", "html_views"=>"230"}
- {"month"=>"8", "year"=>"2014", "pdf_views"=>"24", "xml_views"=>"3", "html_views"=>"165"}
- {"month"=>"9", "year"=>"2014", "pdf_views"=>"26", "xml_views"=>"1", "html_views"=>"166"}
- {"month"=>"10", "year"=>"2014", "pdf_views"=>"21", "xml_views"=>"0", "html_views"=>"204"}
- {"month"=>"11", "year"=>"2014", "pdf_views"=>"19", "xml_views"=>"1", "html_views"=>"212"}
- {"month"=>"12", "year"=>"2014", "pdf_views"=>"17", "xml_views"=>"3", "html_views"=>"64"}
- {"month"=>"1", "year"=>"2015", "pdf_views"=>"19", "xml_views"=>"0", "html_views"=>"80"}
- {"month"=>"2", "year"=>"2015", "pdf_views"=>"20", "xml_views"=>"0", "html_views"=>"83"}
- {"month"=>"3", "year"=>"2015", "pdf_views"=>"22", "xml_views"=>"0", "html_views"=>"70"}
- {"month"=>"4", "year"=>"2015", "pdf_views"=>"18", "xml_views"=>"1", "html_views"=>"75"}
- {"month"=>"5", "year"=>"2015", "pdf_views"=>"23", "xml_views"=>"0", "html_views"=>"88"}
- {"month"=>"6", "year"=>"2015", "pdf_views"=>"27", "xml_views"=>"0", "html_views"=>"120"}
- {"month"=>"7", "year"=>"2015", "pdf_views"=>"17", "xml_views"=>"0", "html_views"=>"64"}
- {"month"=>"8", "year"=>"2015", "pdf_views"=>"20", "xml_views"=>"0", "html_views"=>"83"}
- {"month"=>"9", "year"=>"2015", "pdf_views"=>"22", "xml_views"=>"0", "html_views"=>"77"}
- {"month"=>"10", "year"=>"2015", "pdf_views"=>"13", "xml_views"=>"0", "html_views"=>"72"}
- {"month"=>"11", "year"=>"2015", "pdf_views"=>"15", "xml_views"=>"0", "html_views"=>"77"}
- {"month"=>"12", "year"=>"2015", "pdf_views"=>"17", "xml_views"=>"0", "html_views"=>"58"}
- {"month"=>"1", "year"=>"2016", "pdf_views"=>"23", "xml_views"=>"0", "html_views"=>"93"}
- {"month"=>"2", "year"=>"2016", "pdf_views"=>"19", "xml_views"=>"0", "html_views"=>"59"}
- {"month"=>"3", "year"=>"2016", "pdf_views"=>"15", "xml_views"=>"0", "html_views"=>"77"}
- {"month"=>"4", "year"=>"2016", "pdf_views"=>"19", "xml_views"=>"0", "html_views"=>"72"}
- {"month"=>"5", "year"=>"2016", "pdf_views"=>"20", "xml_views"=>"0", "html_views"=>"75"}
- {"month"=>"6", "year"=>"2016", "pdf_views"=>"21", "xml_views"=>"0", "html_views"=>"56"}
- {"month"=>"7", "year"=>"2016", "pdf_views"=>"85", "xml_views"=>"0", "html_views"=>"70"}
- {"month"=>"8", "year"=>"2016", "pdf_views"=>"22", "xml_views"=>"0", "html_views"=>"76"}
- {"month"=>"9", "year"=>"2016", "pdf_views"=>"36", "xml_views"=>"0", "html_views"=>"102"}
- {"month"=>"10", "year"=>"2016", "pdf_views"=>"38", "xml_views"=>"0", "html_views"=>"95"}
- {"month"=>"11", "year"=>"2016", "pdf_views"=>"20", "xml_views"=>"1", "html_views"=>"92"}
- {"month"=>"12", "year"=>"2016", "pdf_views"=>"48", "xml_views"=>"0", "html_views"=>"94"}
- {"month"=>"1", "year"=>"2017", "pdf_views"=>"53", "xml_views"=>"0", "html_views"=>"87"}
- {"month"=>"2", "year"=>"2017", "pdf_views"=>"52", "xml_views"=>"1", "html_views"=>"99"}
- {"month"=>"3", "year"=>"2017", "pdf_views"=>"53", "xml_views"=>"0", "html_views"=>"125"}
- {"month"=>"4", "year"=>"2017", "pdf_views"=>"33", "xml_views"=>"1", "html_views"=>"88"}
- {"month"=>"5", "year"=>"2017", "pdf_views"=>"85", "xml_views"=>"3", "html_views"=>"137"}
- {"month"=>"6", "year"=>"2017", "pdf_views"=>"24", "xml_views"=>"0", "html_views"=>"68"}
- {"month"=>"7", "year"=>"2017", "pdf_views"=>"27", "xml_views"=>"0", "html_views"=>"70"}
- {"month"=>"8", "year"=>"2017", "pdf_views"=>"26", "xml_views"=>"0", "html_views"=>"67"}
- {"month"=>"9", "year"=>"2017", "pdf_views"=>"28", "xml_views"=>"2", "html_views"=>"62"}
- {"month"=>"10", "year"=>"2017", "pdf_views"=>"24", "xml_views"=>"1", "html_views"=>"93"}
- {"month"=>"11", "year"=>"2017", "pdf_views"=>"18", "xml_views"=>"0", "html_views"=>"66"}
- {"month"=>"12", "year"=>"2017", "pdf_views"=>"13", "xml_views"=>"0", "html_views"=>"64"}
- {"month"=>"1", "year"=>"2018", "pdf_views"=>"20", "xml_views"=>"1", "html_views"=>"68"}
- {"month"=>"2", "year"=>"2018", "pdf_views"=>"24", "xml_views"=>"1", "html_views"=>"47"}
- {"month"=>"3", "year"=>"2018", "pdf_views"=>"26", "xml_views"=>"0", "html_views"=>"50"}
- {"month"=>"4", "year"=>"2018", "pdf_views"=>"25", "xml_views"=>"1", "html_views"=>"43"}
- {"month"=>"5", "year"=>"2018", "pdf_views"=>"17", "xml_views"=>"0", "html_views"=>"41"}
- {"month"=>"6", "year"=>"2018", "pdf_views"=>"27", "xml_views"=>"1", "html_views"=>"54"}
- {"month"=>"7", "year"=>"2018", "pdf_views"=>"16", "xml_views"=>"5", "html_views"=>"44"}
- {"month"=>"8", "year"=>"2018", "pdf_views"=>"15", "xml_views"=>"3", "html_views"=>"45"}
- {"month"=>"9", "year"=>"2018", "pdf_views"=>"28", "xml_views"=>"2", "html_views"=>"37"}
- {"month"=>"10", "year"=>"2018", "pdf_views"=>"20", "xml_views"=>"8", "html_views"=>"37"}
- {"month"=>"11", "year"=>"2018", "pdf_views"=>"22", "xml_views"=>"0", "html_views"=>"32"}
- {"month"=>"12", "year"=>"2018", "pdf_views"=>"17", "xml_views"=>"2", "html_views"=>"31"}
- {"month"=>"1", "year"=>"2019", "pdf_views"=>"10", "xml_views"=>"2", "html_views"=>"25"}
- {"month"=>"2", "year"=>"2019", "pdf_views"=>"24", "xml_views"=>"0", "html_views"=>"38"}
- {"month"=>"3", "year"=>"2019", "pdf_views"=>"17", "xml_views"=>"2", "html_views"=>"53"}
- {"month"=>"4", "year"=>"2019", "pdf_views"=>"30", "xml_views"=>"0", "html_views"=>"47"}
- {"month"=>"5", "year"=>"2019", "pdf_views"=>"30", "xml_views"=>"2", "html_views"=>"42"}
- {"month"=>"6", "year"=>"2019", "pdf_views"=>"36", "xml_views"=>"0", "html_views"=>"46"}
- {"month"=>"7", "year"=>"2019", "pdf_views"=>"30", "xml_views"=>"1", "html_views"=>"33"}
- {"month"=>"8", "year"=>"2019", "pdf_views"=>"31", "xml_views"=>"0", "html_views"=>"61"}
- {"month"=>"9", "year"=>"2019", "pdf_views"=>"25", "xml_views"=>"0", "html_views"=>"42"}
- {"month"=>"10", "year"=>"2019", "pdf_views"=>"98", "xml_views"=>"0", "html_views"=>"57"}
- {"month"=>"11", "year"=>"2019", "pdf_views"=>"19", "xml_views"=>"0", "html_views"=>"29"}
- {"month"=>"12", "year"=>"2019", "pdf_views"=>"21", "xml_views"=>"0", "html_views"=>"25"}
PMC Usage Stats | Further Information
- {"scanned-page-browse"=>"0", "month"=>"1", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"21", "unique-ip"=>"21", "pdf"=>"8", "year"=>"2010", "figure"=>"2", "scanned-summary"=>"0", "supp-data"=>"6"}
- {"month"=>"2", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"28", "year"=>"2010", "pdf"=>"16", "unique-ip"=>"27", "figure"=>"4", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"3", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"39", "unique-ip"=>"33", "pdf"=>"12", "year"=>"2010", "figure"=>"4", "scanned-summary"=>"0", "supp-data"=>"7"}
- {"month"=>"4", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"23", "year"=>"2010", "pdf"=>"23", "unique-ip"=>"25", "figure"=>"4", "scanned-summary"=>"0", "supp-data"=>"7"}
- {"scanned-page-browse"=>"0", "month"=>"5", "cited-by"=>"0", "abstract"=>"4", "full-text"=>"22", "unique-ip"=>"24", "pdf"=>"15", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"7"}
- {"month"=>"6", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"30", "year"=>"2010", "pdf"=>"24", "unique-ip"=>"33", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"7", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"16", "unique-ip"=>"25", "pdf"=>"17", "year"=>"2010", "figure"=>"3", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"8", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"3", "full-text"=>"22", "year"=>"2010", "pdf"=>"27", "unique-ip"=>"26", "figure"=>"4", "scanned-summary"=>"0", "supp-data"=>"2"}
- {"scanned-page-browse"=>"0", "month"=>"9", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"23", "unique-ip"=>"30", "pdf"=>"25", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"4"}
- {"month"=>"10", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"5", "full-text"=>"28", "year"=>"2010", "pdf"=>"23", "unique-ip"=>"33", "figure"=>"2", "scanned-summary"=>"0", "supp-data"=>"4"}
- {"scanned-page-browse"=>"0", "month"=>"11", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"16", "unique-ip"=>"17", "pdf"=>"14", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"12", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"17", "year"=>"2010", "pdf"=>"10", "unique-ip"=>"17", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"1", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"17", "unique-ip"=>"22", "pdf"=>"17", "year"=>"2011", "figure"=>"6", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"2", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"11", "year"=>"2011", "pdf"=>"4", "unique-ip"=>"15", "figure"=>"4", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"3", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"14", "unique-ip"=>"15", "pdf"=>"5", "year"=>"2011", "figure"=>"4", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"4", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"16", "year"=>"2011", "pdf"=>"6", "unique-ip"=>"18", "figure"=>"6", "scanned-summary"=>"0", "supp-data"=>"6"}
- {"scanned-page-browse"=>"0", "month"=>"5", "cited-by"=>"0", "abstract"=>"4", "full-text"=>"24", "unique-ip"=>"23", "pdf"=>"22", "year"=>"2011", "figure"=>"3", "scanned-summary"=>"0", "supp-data"=>"2"}
- {"month"=>"6", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"17", "year"=>"2011", "pdf"=>"17", "unique-ip"=>"19", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"7", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"14", "unique-ip"=>"14", "pdf"=>"13", "year"=>"2011", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"8", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"12", "year"=>"2011", "pdf"=>"7", "unique-ip"=>"15", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"9", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"16", "unique-ip"=>"19", "pdf"=>"5", "year"=>"2011", "figure"=>"3", "scanned-summary"=>"0", "supp-data"=>"3"}
- {"month"=>"10", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"20", "year"=>"2011", "pdf"=>"16", "unique-ip"=>"19", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"11", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"14", "unique-ip"=>"10", "pdf"=>"10", "year"=>"2011", "figure"=>"6", "scanned-summary"=>"0", "supp-data"=>"8"}
- {"month"=>"12", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"19", "year"=>"2011", "pdf"=>"14", "unique-ip"=>"21", "figure"=>"3", "scanned-summary"=>"0", "supp-data"=>"3"}
- {"scanned-page-browse"=>"0", "month"=>"1", "cited-by"=>"1", "abstract"=>"0", "full-text"=>"23", "unique-ip"=>"22", "pdf"=>"17", "year"=>"2012", "figure"=>"2", "scanned-summary"=>"0", "supp-data"=>"3"}
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