Commentary: Indoleamine 2,3-Dioxygenase-Expressing Aortic Plasmacytoid Dendritic Cells Protect against Atherosclerosis by Induction of Regulatory T Cells - Maffia, Pasquale; Döring, Yvonne; Biessen, Erik A. L.; Mallat, Ziad (Frontiers in Immunology, 2017)