The aim of the current study is to characterize the interleukin 25 (IL25)-induced splenic ILC2 population (Lin−CD45+IL17RB+ICOS+IL7raintermediate) and address its direct role in experimental atherosclerosis by its adoptive transfer to hypercholesterolaemic apolipoprotein E deficient (apoE−/−) mice. Here, IL17RB is linked to atherosclerosis.