title: Tfr cells and IgA join forces to diversify the microbiota.
abstract: How diversity of the microbiota is generated and maintained is an open question. In this issue of Immunity, Kawamoto et al. show that T follicular regulatory cells foster microbiota diversity via the regulation of IgA selection.
authors.affiliation: Department of Experimental Oncology, European Institute of Oncology, 20139 Milan, Italy. Electronic address: maria.rescigno@ieo.eu.
authors.forename: Maria
authors.initials: M
authors.lastname: Rescigno
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D041981:Gastrointestinal Tract / Q000276:immunology* / Q000382:microbiology*; D007070:Immunoglobulin A / Q000276:immunology*; D064307:Microbiota / Q000276:immunology*
chemical_list: D007070:Immunoglobulin A