A, Aortas from bone marrow–transplanted mice were made into single-cell suspensions by enzymatic digestion and stained. Live CD45+ leukocytes were counted in aortas of 16-week Western diet–fed Ldlr−/− mice transplanted with Il27ra−/− (n=7) or C57BL/6 (wild-type [wt]; n=7) bone marrow. Left panels show representative dot plots. Right panel shows mean±SEM, *P<0.05. B, left, Live CD45+ cells from aortas were stained for TCRβ and CD4. Numbers indicate percentage in indicated gates. B, right, Absolute number of live CD45+, TCRβ+, CD4+TCRβ+, and CD8+TCRβ+ cells in aortas from Ldlr−/− mice transplanted with Il27ra−/− or wt bone marrow (n=7) each. Mean±SEM *P<0.05. Localization of CD3+ cells in aortic roots (C) and abdominal aortas (D) of Ldlr−/− mice transplanted with Il27ra−/− or C57BL/6 (wt) bone marrow as seen by immunofluorescence. L indicates lumen; P, plaque; A, adventitia. Representative images from 1 of 3 independent experiments. Mean±SEM number of CD3+ cells per section in aortic roots (C, right) and abdominal aortas (D, right) of Ldlr−/− mice transplanted with Il27ra−/− (n=6) or C57BL/6 (wt; n=6) bone marrow are shown.