A) Representative images and quantification of immunostaining for the proliferation marker Ki67 (red) and DAPI (blue) in aortic root plaques of mice at baseline and after chow diet + tamoxifen (TAM) treatment (MøCtrl and MøΔNtn1). Scale bar = 100 μm. n = 7 mice/group. B) Quantification of TUNEL+ apoptotic cells in aortic root plaques of mice at baseline (Ntn1fl/flCx3cr1WT n=7, Ntn1fl/flCx3cr1CreER+ n=8) and after chow diet + TAM (MøCtrl n=9, MøΔNtn1 n=8). C) Quantification of EdU+ Ly6hi monocyte recruitment into aortic root plaques (BL: Ntn1fl/flCx3cr1WT n=9, Ntn1fl/flCx3cr1CreER+ n=8; TAM: MøCtrl n=9, MøΔNtn1 n=9). D) Quantification of green bead-labelled Ly6lo monocyte recruitment into aortic root plaques (BL: Ntn1fl/flCx3cr1WT n=9, Ntn1fl/flCx3cr1CreER+ n=7; TAM: MøCtrl n=10, MøΔNtn1 n=10). E) Retention of baseline-labelled macrophages in aortic root plaques of MøCtrl and MøΔNtn1 mice. (BL: Ntn1fl/flCx3cr1WT n=8, Ntn1fl/flCx3cr1CreER+ n=8; TAM: MøCtrl n=9, MøΔNtn1 n=10). F) Quantification of bead labeled macrophages in the mediastinal, intestinal, and splenic lymph nodes (LN) of MøCtrl and MøΔNtn1 (n=7 mice/group). A-F) Data are mean ± SEM. P values were determined by (A-E) one-way ANOVA with post-hoc Tukey’s test, or (F) two tailed Student’s t-test for mediastinal and intestinal LN; or Mann-Whitney test for Spleen LN.