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Schmitz, Iwana; Schneider, Christoph; Fröhlich, Anja; Frebel, Helge; Christ, Daniel; Leonard, Warren J.; Sparwasser, Tim; Oxenius, Annette; Freigang, Stefan Bernd; Kopf, Manfred (2013). IL-21 restricts virus-driven Treg cell expansion in chronic LCMV infection. PLoS pathogens, 9(5), e1003362. Public Library of Science 10.1371/journal.ppat.1003362