title: Editorial: T cell regulation by the environment.
authors.affiliation: School of Medicine, Yale University , New Haven, CT , USA.
authors.forename: David A
authors.initials: DA
authors.lastname: Hafler
authors.affiliation: MRC Centre for Inflammation Research , University of Edinburgh , UK.
authors.forename: Anne L
authors.initials: AL
authors.lastname: Astier
keywords: T cells; environment; metabolism; microbiome; pathogens; regulatory T cells; vitamin D